کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5398433 | 1505883 | 2016 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A facile single injection Hydrothermal method for the synthesis of thiol capped CdTe Quantum dots as light harvesters
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کلمات کلیدی
NaBH4CdTeMPAQDsSIHQuantum confinement effect - اثر محرمانگی کوانتومی3-Mercaptopropionic acid - اسید 3-مروپپروپرونیکOptical property - اموال نوریMEG - بهSodium borohydride - بورو هیدرید سدیمCadmium telluride - تلورید کادمیومTellurium - تلوریمAqueous synthesis - سنتز آبMultiple exciton generation - نسل اکسایتون چندگانهquantum dots - نقاط کوانتومیCadmium nitrate - نیترات کادمیوم
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A facile, Single Injection Hydrothermal (SIH) method has been developed to synthesize high quality 3-Mercaptopropionic Acid (MPA) stabilized aqueous CdTe QDs, entirely in ambient environment. The synthesis protocol eliminates the use of inert atmosphere for reducing elemental Tellurium powder to Te precursor avoiding the oxidation of Te powder. The XRD result revealed that the synthesized QDs are in cubic zincblende type crystalline structure, without signature of Te oxidation. FTIR spectra have confirmed the attachment of short chained organic compound MPA to the surface of QDs by covalent bond. The Quantum confinement effect was clearly evident by shift in Longitudinal Optic (LO) peak of Raman spectra and absorption peak wavelength with respect to bulk CdTe materials. The optical direct band gap energy of CdTe QDs is between 3.63Â eV to 1.96Â eV and QDs size below 6Â nm, confirm the QDs are well under strong Quantum confinement regime. Also, photoluminescence spectra depict a stable and high luminescence emission from green to dark red color. All these results corroborate that the synthesis of CdTe QDs procedure is very advantageous and present a simple, economical and easily up scalable method for large scale production.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 178, October 2016, Pages 362-367
Journal: Journal of Luminescence - Volume 178, October 2016, Pages 362-367
نویسندگان
B. Jai Kumar, D. Sumanth Kumar, H.M. Mahesh,