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 publicationJournal articleAcademic researchpeer-review

5 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 languageEnglish
Article number053104
JournalApplied Physics Letters
Volume110
Issue number5
DOIs
Publication statusPublished - 30 Jan 2017

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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