Selenium quantum dots: Preparation, structure, and properties

Fuli Qian; Xueming Li; Libin Tang; Sin Ki Lai; Chaoyu Lu; Shu Ping Lau

doi:10.1063/1.4975358

Selenium quantum dots: Preparation, structure, and properties

Fuli Qian, Xueming Li, Libin Tang, Sin Ki Lai, Chaoyu Lu, Shu Ping Lau

Research output: Journal article publication › Journal article › Academic research › peer-review

18 Citations (Scopus)

Abstract

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 NbSe2powders 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.

Original language	English
Article number	053104
Journal	Applied Physics Letters
Volume	110
Issue number	5
DOIs	https://doi.org/10.1063/1.4975358
Publication status	Published - 30 Jan 2017

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4975358

http://hdl.handle.net/10397/66065

Cite this

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abstract = "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 NbSe2powders 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.",

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AU - Li, Xueming

AU - Tang, Libin

AU - Lai, Sin Ki

AU - Lu, Chaoyu

AU - Lau, Shu Ping

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Selenium quantum dots: Preparation, structure, and properties

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