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  <xs:import namespace="http://fasb.org/us-types/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-types-2026.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://fasb.org/srt-types/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-types-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/sic/2026" schemaLocation="https://xbrl.sec.gov/sic/2026/sic-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd-sub/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-sub-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei-sub/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-sub-2026.xsd"/>
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  <xs:element name="ScheduleOfPotentiallyDilutiveCommonStockEquivalentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ScheduleOfPotentiallyDilutiveCommonStockEquivalentsAbstract"/>
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  <xs:element name="ScheduleOfRsuActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ScheduleOfRsuActivityAbstract"/>
  <xs:element name="ScheduleOfAwardsWithMarketBasedConditionsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ScheduleOfAwardsWithMarketBasedConditionsAbstract"/>
  <xs:element name="ScheduleOfCompanySLiabilitiesThatAreMeasuredAtFairValueAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ScheduleOfCompanySLiabilitiesThatAreMeasuredAtFairValueAbstract"/>
  <xs:element name="ScheduleOfFairValueMeasurementOfTheFpaAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ScheduleOfFairValueMeasurementOfTheFpaAbstract"/>
  <xs:element name="ScheduleOfDetermineTheFairValueAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ScheduleOfDetermineTheFairValueAbstract"/>
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  <xs:element name="IssuedPatentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_IssuedPatentsAbstract"/>
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  <xs:element name="StockIssuedDuringPeriodValueForwardPurchaseAgreementSubscriptionReceivableDiscount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_StockIssuedDuringPeriodValueForwardPurchaseAgreementSubscriptionReceivableDiscount"/>
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  <xs:element name="StockIssuedDuringPeriodValueStockbasedCompensationToConsultant" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_StockIssuedDuringPeriodValueStockbasedCompensationToConsultant"/>
  <xs:element name="StockIssuedDuringPeriodValueSharesIssuedToConsultant" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_StockIssuedDuringPeriodValueSharesIssuedToConsultant"/>
  <xs:element name="StockIssuedDuringPeriodSharesIssuedFromWarrantConversioninShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_StockIssuedDuringPeriodSharesIssuedFromWarrantConversioninShares"/>
  <xs:element name="StockIssuedDuringPeriodSharesReverseStockSplit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_StockIssuedDuringPeriodSharesReverseStockSplit"/>
  <xs:element name="IncreaseDecreaseInDeferredOfferingCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_IncreaseDecreaseInDeferredOfferingCost"/>
  <xs:element name="IncreaseDecreaseInExciseTaxes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="sti_IncreaseDecreaseInExciseTaxes"/>
  <xs:element name="FPADiscountAccretion" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_FPADiscountAccretion"/>
  <xs:element name="DebtDiscountRecognizedOnNotePayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="sti_DebtDiscountRecognizedOnNotePayable"/>
  <xs:element name="CapitalizedInterestToPrincipalBalanceOfShorttermNotePayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_CapitalizedInterestToPrincipalBalanceOfShorttermNotePayable"/>
  <xs:element name="ReverseStockSplitReclassificationFromCommonStockToAdditionalPaidinCapital" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_ReverseStockSplitReclassificationFromCommonStockToAdditionalPaidinCapital"/>
  <xs:element name="SharesIssuableUponSettlementOfWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="sti_SharesIssuableUponSettlementOfWarrants"/>
  <xs:element name="RecapitalizationTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_RecapitalizationTextBlock"/>
  <xs:element name="WarrantsTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_WarrantsTextBlock"/>
  <xs:element name="ForwardPurchaseAgreementNonRedemptionAgreementAndPrivatePlacementFinancingTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ForwardPurchaseAgreementNonRedemptionAgreementAndPrivatePlacementFinancingTextBlock"/>
  <xs:element name="EmergingGrowthCompanyPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_EmergingGrowthCompanyPolicyTextBlock"/>
  <xs:element name="PatentsPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_PatentsPolicyTextBlock"/>
  <xs:element name="EquityLinkedInstrumentsPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_EquityLinkedInstrumentsPolicyTextBlock"/>
  <xs:element name="WarrantsPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_WarrantsPolicyTextBlock"/>
  <xs:element name="ForwardPurchaseAgreementAndNonRedemptionAgreementPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ForwardPurchaseAgreementAndNonRedemptionAgreementPolicyTextBlock"/>
  <xs:element name="OtherCurrentAssetsPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_OtherCurrentAssetsPolicyTextBlock"/>
  <xs:element name="ReverseStockSplitPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ReverseStockSplitPolicyTextBlock"/>
  <xs:element name="ScheduleOfPropertyAndEquipmentEstimatedUsefulLivesTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ScheduleOfPropertyAndEquipmentEstimatedUsefulLivesTableTextBlock"/>
  <xs:element name="ScheduleOfFairValueAssumptionsOfWarrantsTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ScheduleOfFairValueAssumptionsOfWarrantsTableTextBlock"/>
  <xs:element name="IssuanceOfCommonStockForForwardPurchaseAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_IssuanceOfCommonStockForForwardPurchaseAgreement"/>
  <xs:element name="CorrectionOfPriorperiodErrorFPASubscriptionReceivableDiscount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_CorrectionOfPriorperiodErrorFPASubscriptionReceivableDiscount"/>
  <xs:element name="SummaryofSignificantAccountingPoliciesScheduleofPropertyandEquipmentEstimatedUsefulLivesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_SummaryofSignificantAccountingPoliciesScheduleofPropertyandEquipmentEstimatedUsefulLivesDetailsTable"/>
  <xs:element name="FiniteLivedIntangibleAssetsIssuedPatentsNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="sti_FiniteLivedIntangibleAssetsIssuedPatentsNet"/>
  <xs:element name="FiniteLivedIntangibleAssetsPatentsPendingnotAmortized" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="sti_FiniteLivedIntangibleAssetsPatentsPendingnotAmortized"/>
  <xs:element name="AntidilutiveSecuritiesIncludedFromComputationOfEarningsPerShareAmount" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_AntidilutiveSecuritiesIncludedFromComputationOfEarningsPerShareAmount"/>
  <xs:element name="StockBasedCompensationScheduleofRSUActivityDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_StockBasedCompensationScheduleofRSUActivityDetailsTable"/>
  <xs:element name="StockBasedCompensationScheduleofRSUActivityDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_StockBasedCompensationScheduleofRSUActivityDetailsLineItems"/>
  <xs:element name="StockBasedCompensationScheduleofAwardswithMarketBasedConditionsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_StockBasedCompensationScheduleofAwardswithMarketBasedConditionsDetailsTable"/>
  <xs:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue" type="dtr:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue"/>
  <xs:element name="FairValueMeasurementsScheduleofCompanysLiabilitiesthatareMeasuredatFairValueDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_FairValueMeasurementsScheduleofCompanysLiabilitiesthatareMeasuredatFairValueDetailsTable"/>
  <xs:element name="FairValueMeasurementsScheduleofDeterminetheFairValueDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_FairValueMeasurementsScheduleofDeterminetheFairValueDetailsTable"/>
  <xs:element name="DescriptionofOrganizationBusinessOperationsandGoingConcernDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_DescriptionofOrganizationBusinessOperationsandGoingConcernDetailsTable"/>
  <xs:element name="MergerAgreementDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_MergerAgreementDescription"/>
  <xs:element name="AdditionalIssuanceOfCommonStock" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_AdditionalIssuanceOfCommonStock"/>
  <xs:element name="CorrectionofErrorsinPreviouslyReportedConsolidatedFinancialStatementsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_CorrectionofErrorsinPreviouslyReportedConsolidatedFinancialStatementsDetailsTable"/>
  <xs:element name="SummaryofSignificantAccountingPoliciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_SummaryofSignificantAccountingPoliciesDetailsTable"/>
  <xs:element name="NetUnissuedPatents" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="sti_NetUnissuedPatents"/>
  <xs:element name="PercentageOfNumberOfStocksOfCommonStockOutstanding" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_PercentageOfNumberOfStocksOfCommonStockOutstanding"/>
  <xs:element name="CommonStockGrantedShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_CommonStockGrantedShares"/>
  <xs:element name="CommonStockSharesCancelled" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_CommonStockSharesCancelled"/>
  <xs:element name="IssuanceShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_IssuanceShares"/>
  <xs:element name="RecapitalizationDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_RecapitalizationDetailsTable"/>
  <xs:element name="EarnoutMeasurementInputs" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="sti_EarnoutMeasurementInputs"/>
  <xs:element name="RelatedPartiesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_RelatedPartiesDetailsTable"/>
  <xs:element name="TransactionCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="sti_TransactionCosts"/>
  <xs:element name="ServicesOrEmployeeCostsOwed" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_ServicesOrEmployeeCostsOwed"/>
  <xs:element name="CashForWorkingCapital" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_CashForWorkingCapital"/>
  <xs:element name="CommitmentsandContingenciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_CommitmentsandContingenciesDetailsTable"/>
  <xs:element name="UnpaidFederalIncomeTaxBalanceOwed" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_UnpaidFederalIncomeTaxBalanceOwed"/>
  <xs:element name="StockholdersEquityDeficitDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_StockholdersEquityDeficitDetailsTable"/>
  <xs:element name="UnitsIssuedDuringPeriodSharesPrefundUnits" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_UnitsIssuedDuringPeriodSharesPrefundUnits"/>
  <xs:element name="WarrantsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_WarrantsDetailsTable"/>
  <xs:element name="NumberOfPurchasedCommonStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_NumberOfPurchasedCommonStock"/>
  <xs:element name="ClassOfWarrantOrRightRedemptionPriceOfWarrantsOrRights" type="dtr:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ClassOfWarrantOrRightRedemptionPriceOfWarrantsOrRights"/>
  <xs:element name="WarrantsPriorNoticePeriodDays" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_WarrantsPriorNoticePeriodDays"/>
  <xs:element name="ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsStockPriceTrigger" type="dtr:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsStockPriceTrigger"/>
  <xs:element name="ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsThresholdConsecutiveTradingDays" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsThresholdConsecutiveTradingDays"/>
  <xs:element name="NumberOfTradingDays" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_NumberOfTradingDays"/>
  <xs:element name="ClassOfWarrantsSharesExercised" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="sti_ClassOfWarrantsSharesExercised"/>
  <xs:element name="CommonStockIssuedUponExerciseOfWarrant" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="sti_CommonStockIssuedUponExerciseOfWarrant"/>
  <xs:element name="FairValueWarrantsExercised" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_FairValueWarrantsExercised"/>
  <xs:element name="NumberOfRatioWarrantsShare" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_NumberOfRatioWarrantsShare"/>
  <xs:element name="ForwardPurchaseAgreementNonRedemptionAgreementAndPrivatePlacementFinancingDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_ForwardPurchaseAgreementNonRedemptionAgreementAndPrivatePlacementFinancingDetailsTable"/>
  <xs:element name="SharesOutstandingPercentage" type="dtr:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="sti_SharesOutstandingPercentage"/>
  <xs:element name="PrepaymentShortfallForPurchaseAgreement" type="dtr:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="sti_PrepaymentShortfallForPurchaseAgreement"/>
  <xs:element name="PurchaseOfInitialPrice" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_PurchaseOfInitialPrice"/>
  <xs:element name="CashPayment" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_CashPayment"/>
  <xs:element name="ReimbursementConsiderationShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="sti_ReimbursementConsiderationShares"/>
  <xs:element name="StockIssuedDuringPeriodValueStockSubscriptionReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_StockIssuedDuringPeriodValueStockSubscriptionReceivable"/>
  <xs:element name="AccretedDiscountAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="sti_AccretedDiscountAmount"/>
  <xs:element name="RecycledSharesRelatedToTheFPA" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_RecycledSharesRelatedToTheFPA"/>
  <xs:element name="DebtDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_DebtDetailsTable"/>
  <xs:element name="ConvertibleNoteSharesOfRemainedOutstanding" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="sti_ConvertibleNoteSharesOfRemainedOutstanding"/>
  <xs:element name="StockBasedCompensationDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_StockBasedCompensationDetailsTable"/>
  <xs:element name="PercentageOfCashBonus" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_PercentageOfCashBonus"/>
  <xs:element name="FairValueMeasurementsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_FairValueMeasurementsDetailsTable"/>
  <xs:element name="WarrantsRemainedOutstanding" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="sti_WarrantsRemainedOutstanding"/>
  <xs:element name="SubsequentEventsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="sti_SubsequentEventsDetailsTable"/>
  <xs:element name="AnsonInvestmentsMasterFundLPAnsonMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_AnsonInvestmentsMasterFundLPAnsonMember"/>
  <xs:element name="AwardsWithMarketBasedConditionsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_AwardsWithMarketBasedConditionsMember"/>
  <xs:element name="BeneschFriedlanderCoplanAronoffLLPMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_BeneschFriedlanderCoplanAronoffLLPMember"/>
  <xs:element name="ConvertibleNotesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ConvertibleNotesMember"/>
  <xs:element name="EFHuttonMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_EFHuttonMember"/>
  <xs:element name="EquityIncentivePlanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_EquityIncentivePlanMember"/>
  <xs:element name="FPAShareMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_FPAShareMember"/>
  <xs:element name="ForwardPurchaseAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ForwardPurchaseAgreementMember"/>
  <xs:element name="G3HoldbackSharesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_G3HoldbackSharesMember"/>
  <xs:element name="GlobalGrapheneGroupMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_GlobalGrapheneGroupMember"/>
  <xs:element name="GreatPointCapitalLLCMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_GreatPointCapitalLLCMember"/>
  <xs:element name="HBCEarnoutArrangementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_HBCEarnoutArrangementMember"/>
  <xs:element name="HBCEarnoutSharesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_HBCEarnoutSharesMember"/>
  <xs:element name="HBCHoldbackSharesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_HBCHoldbackSharesMember"/>
  <xs:element name="HBCShareholdersMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_HBCShareholdersMember"/>
  <xs:element name="IPOWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_IPOWarrantsMember"/>
  <xs:element name="MachFMMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_MachFMMember"/>
  <xs:element name="MadisonBondMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_MadisonBondMember"/>
  <xs:element name="MarchPrivatePlacementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_MarchPrivatePlacementMember"/>
  <xs:element name="MergerAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_MergerAgreementMember"/>
  <xs:element name="MonteCarloMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_MonteCarloMember"/>
  <xs:element name="NUBISharesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_NUBISharesMember"/>
  <xs:element name="NotesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_NotesMember"/>
  <xs:element name="PrivatePlacementWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_PrivatePlacementWarrantsMember"/>
  <xs:element name="PrivateWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_PrivateWarrantsMember"/>
  <xs:element name="PromissoryNoteMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_PromissoryNoteMember"/>
  <xs:element name="RestatedMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_RestatedMember"/>
  <xs:element name="ReverseStockSplitMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_ReverseStockSplitMember"/>
  <xs:element name="SeriesAAndBWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_SeriesAAndBWarrantsMember"/>
  <xs:element name="SeriesAWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_SeriesAWarrantsMember"/>
  <xs:element name="SeriesBWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_SeriesBWarrantsMember"/>
  <xs:element name="SeriesCAndDWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_SeriesCAndDWarrantsMember"/>
  <xs:element name="SeriesCWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_SeriesCWarrantsMember"/>
  <xs:element name="SeriesDWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_SeriesDWarrantsMember"/>
  <xs:element name="StockBasedCompensationEquityAwardsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_StockBasedCompensationEquityAwardsMember"/>
  <xs:element name="StockSubscriptionReceivableMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_StockSubscriptionReceivableMember"/>
  <xs:element name="StockbasedCompensationWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_StockbasedCompensationWarrantsMember"/>
  <xs:element name="TaxLienMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_TaxLienMember"/>
  <xs:element name="TerminationAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_TerminationAgreementMember"/>
  <xs:element name="WarrantsPrivateMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_WarrantsPrivateMember"/>
  <xs:element name="WarrantsPublicMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_WarrantsPublicMember"/>
  <xs:element name="WarrantsSeriesAAndBMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_WarrantsSeriesAAndBMember"/>
  <xs:element name="WarrantsSeriesAMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_WarrantsSeriesAMember"/>
  <xs:element name="WarrantsSeriesCAndDMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_WarrantsSeriesCAndDMember"/>
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  <xs:element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="sti_DocumentAndEntityInformationAbstract"/>
</xs:schema>
