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Surface chemistry of as synthesized and amine exchanged colloidal PbS quantum dots

عنوان مقاله: Surface chemistry of as synthesized and amine exchanged colloidal PbS quantum dots
شناسه (COI) مقاله: IMES10_358
منتشر شده در دهمین همایش مشترک و پنجمین کنفرانس بین المللی انجمن مهندسی مواد و متالورژی و انجمن علمی ریخته گری ایران در سال 1395
مشخصات نویسندگان مقاله:

Hossein Beygi - PhD student in materials science and metallurgical engineering
Seyyed Abdolkarim Sajjadi - Professor, Department of Materials Science and Metallurgical Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran
Abolfazl Babakhani - Associate professor, Department of Materials Science and Metallurgical Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran.

خلاصه مقاله:
PbS nanoparticles were synthesized in this study through hot injection process and optical properties as well as their quantum confinement were investigated. The results of UV-Vis-NIR spectroscopy analyses and transmission electron microscopy (TEM) showed that synthesized nanoparticles with dimensions of 2.3 to 4.2 nm had absorption peaks between 768 to 973 nm. As synthesized PbS QDs were capped with oleic acid (OA) ligands and kept as stable colloids in argon atmosphere. The effects of three steps were investigated on the optical properties and subsequent oxidation of PbS QDs; ligand exchange to ethyl amine (EA), changing the storage conditions from argon to air atmosphere, and colloidal to solid film transformation. Surface chemistry investigations by the means of NMR, FTIR, XRD and XPS indicated that variations on the optical properties of PbS quantum dots is related to oxygen absorption on the surface of QDs and preparation of PbSO3 and PbO oxides on their surfaces

کلمات کلیدی:
Quantum dot, Infrared absorption, Oxidation, Thin film, Ligand exchange

صفحه اختصاصی مقاله و دریافت فایل کامل: https://civilica.com/doc/574797/