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effect of ph on optical properties of graphene oxide quantum dots
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نویسنده
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sherzad ahmad zia ,zare hakimeh ,shahedi zahra ,ostovari fatemeh ,fazaeli yousef ,pourghobadi zeinab
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منبع
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international journal of optics and photonics - 2020 - دوره : 14 - شماره : 2 - صفحه:135 -142
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چکیده
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Luminescent graphene oxide quantum dots (goqds) have attracted tremendous attention from scientists in chemistry, materials, biology, and physics science. they have specific properties such as low cytotoxicity, excellent electrochemical and optical properties, resistance to photo-bleaching, and good stability. in this study, goqds were synthesized using a simple and straightforward methodology. the synthesized goqds were characterized by fourier transform infrared (ftir) analyzer, ultraviolet -visible spectrophotometry (uv -vis) absorption, photoluminescence (pl) spectroscopy, and transmission electron microscopy (tem) analyses. then, optical properties of goqds such as absorption and luminescence with various ph values were investigated. goqds show absorption in the ultraviolet (uv) region and their position of photoluminescence peak is independent of ph value. the average size of qds is less than 5 nm, as revealed by tem. the goqds show green luminescence under uv irradiation (360 nm).
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کلیدواژه
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graphene oxide ,quantum dots ,ph ,photoluminescence ,uv-vis.
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آدرس
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yazd university, faculty of science, physics department, iran, yazd university, faculty of science, physics department, iran, yazd university, faculty of science, physics department, iran, yazd university, faculty of science, physics department, iran, nuclear science and technology research institute (nstri), radiation application research school, iran, islamic azad university, khorramabad branch, department of chemistry, iran
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پست الکترونیکی
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zpourghobadi@gmail.com
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Authors
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