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Selenium quantum dots: Preparation, structure, and properties
An interesting class of low-dimensional nanomaterials, namely, selenium quantum dots (SeQDs), which are composed of nano-sized selenium particles, is reported in this study. The SeQDs possess a hexagonal crystal structure. They can be synthesized in large quantity by ultrasound liquid-phase exfoliat...
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Published in: | Applied physics letters 2017-01, Vol.110 (5) |
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creator | Qian, Fuli Li, Xueming Tang, Libin Lai, Sin Ki Lu, Chaoyu Lau, Shu Ping |
description | An interesting class of low-dimensional nanomaterials, namely, selenium quantum dots (SeQDs), which are composed of nano-sized selenium particles, is reported in this study. The SeQDs possess a hexagonal crystal structure. They can be synthesized in large quantity by ultrasound liquid-phase exfoliation using NbSe2 powders as the source material and N-Methyl-2-pyrrolidone (NMP) as the dispersant. During sonication, the Nb-Se bonds dissociate; the SeQDs are formed, while niobium is separated by centrifugation. The SeQDs have a narrow diameter distribution from 1.9 to 4.6 nm and can be dispersed with high stability in NMP without the need for passivating agents. They exhibit photoluminescence properties that are expected to find useful applications in bioimaging, optoelectronics, as well as nanocomposites. |
doi_str_mv | 10.1063/1.4975358 |
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subjects | Applied physics Crystal structure Dispersants Liquid phases Medical imaging Nanocomposites Nanomaterials Niobium Optoelectronics Photoluminescence Quantum dots Selenium |
title | Selenium quantum dots: Preparation, structure, and properties |
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