Said Abdallah Abdelhalim Gohnim
Prof. Emeritus
Photoacousticstudyofopticalandthermalproperties of alloyedCdTexS1x nanocrystals
• 2014
Publication Information
Authors
s
ZahrahEl-Qahtani , AliBadawi , K.Easawi , N.Al-Hosiny , S.Abdallah
Keywords
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Pages
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publication.type
International
Paper Link
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Supplementary Materials
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Abstract
Photoacoustic (PA )technique has been applied to studythe optical and thermal properties
of the alloyed CdTexS1x (nanocrystals (NCs)withdifferent(Te/(SþTe) )molarratio(x¼0,
0.2,0.4,0.6,0.8and1).Increasing x value causesc learlyobservedredshiftofthe
correspondingexcitonpeakinPAspectra.Thesamespectrawerecomparedtothose
obtainedbyaregularUV–Vis. absorption.Theeffectivemassapproximation(EMA)model
wasappliedtodeterminethesizeoftheNCs.ThecalculatedsizesofthealloyedNCsarein
a goodagreementwiththedirectlymeasuredvaluesobtainedusinghighresolution
transmission electronmicroscopy(HRTEM).Thevaluesofthermaldiffusivityandthermal
conductivityobtainedusingPAtechniqueshowatleastanorderofmagnitudelargerthan
that ofthebulkvalues
of the alloyed CdTexS1x (nanocrystals (NCs)withdifferent(Te/(SþTe) )molarratio(x¼0,
0.2,0.4,0.6,0.8and1).Increasing x value causesc learlyobservedredshiftofthe
correspondingexcitonpeakinPAspectra.Thesamespectrawerecomparedtothose
obtainedbyaregularUV–Vis. absorption.Theeffectivemassapproximation(EMA)model
wasappliedtodeterminethesizeoftheNCs.ThecalculatedsizesofthealloyedNCsarein
a goodagreementwiththedirectlymeasuredvaluesobtainedusinghighresolution
transmission electronmicroscopy(HRTEM).Thevaluesofthermaldiffusivityandthermal
conductivityobtainedusingPAtechniqueshowatleastanorderofmagnitudelargerthan
that ofthebulkvalues