أعضاء هيئة التدريس - جامعة بنها
Photoacousticstudyofopticalandthermalproperties of alloyedCdTexS1x nanocrystals
• 2014
معلومات البحث
المؤلفون
s
ZahrahEl-Qahtani , AliBadawi , K.Easawi , N.Al-Hosiny , S.Abdallah
الكلمات المفتاحية
Not Available
المجلة العلمية
Not Available
الناشر
Not Available
المجلد
Not Available
العدد
Not Available
الصفحات
Not Available
publication.type
International
رابط البحث
Open Link
المواد المرفقة
Not Available
الملخص
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