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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Bibliographic Details
Published in:Applied physics letters 2017-01, Vol.110 (5)
Main Authors: Qian, Fuli, Li, Xueming, Tang, Libin, Lai, Sin Ki, Lu, Chaoyu, Lau, Shu Ping
Format: Article
Language:English
Subjects:
Applied physics
Crystal structure
Dispersants
Liquid phases
Medical imaging
Nanocomposites
Nanomaterials
Niobium
Optoelectronics
Photoluminescence
Quantum dots
Selenium
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4975358