Controllable Synthesis of Bandgap-Tunable CuSxSe1-x Nanoplate Alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

16 Scopus Citations
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Author(s)

  • Jun Xu
  • Xia Yang
  • Qing-Dan Yang
  • Xing Huang
  • Yongbing Tang

Detail(s)

Original languageEnglish
Pages (from-to)1490-1495
Journal / PublicationChemistry - An Asian Journal
Volume10
Issue number7
Publication statusPublished - 1 Jul 2015

Abstract

Composition engineering is an important approach for modulating the physical properties of alloyed semiconductors. In this work, ternary CuSxSe1-x nanoplates over the entire composition range of 0≤x≤1 have been controllably synthesized by means of a simple aqueous solution method at low temperature (90 °C). Reaction of Cu2+ cations with polysulfide/-selenide ((SnSem)2-) anions rather than independent Sn2- and Sem2- anions is responsible for the low-temperature and rapid synthesis of CuSxSe1-x alloys, and leads to higher S/Se ratios in the alloys than that in reactants owing to different dissociation energies of the Se-Se and the S-S bonds. The lattice parameters 'a' and 'c' of the hexagonal CuSxSe1-x alloys decrease linearly, whereas the direct bandgaps increase quadratically along with the S content. Direct bandgaps of the alloys can be tuned over a wide range from 1.64 to 2.19 eV. Raman peaks of the S-Se stretching mode are observed, thus further confirming formation of the alloyed CuSxSe1-x phase. Great composers: Homogeneously alloyed CuSxSe1-x nanoplates have been controllably synthesized over the entire range of 0≤x≤1 by direct reaction of Cu2+ cations with polysulfide/-selenide ((SnSem)2-) anions. Tunable Raman and optical absorption properties of the CuSxSe1-x nanoplates were achieved by composition engineering.

Research Area(s)

  • chalcogens, copper, nanostructures, selenium, sulfur

Citation Format(s)

Controllable Synthesis of Bandgap-Tunable CuSxSe1-x Nanoplate Alloys. / Xu, Jun; Yang, Xia; Yang, Qing-Dan; Huang, Xing; Tang, Yongbing; Zhang, Wenjun; Lee, Chun-Sing.

In: Chemistry - An Asian Journal, Vol. 10, No. 7, 01.07.2015, p. 1490-1495.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review