Semiconductor Pb2P2S6 and size-dependent band gap energy of its nanoparticles

Xian Zhang; Jianqiao He; Wei Chen; Chao Wang; Chong Zheng; Jianhua Lin; Xia Zhang; Fuqiang Huang

doi:10.1039/C4RA06663D

Semiconductor Pb₂P₂S₆ and size-dependent band gap energy of its nanoparticles

Xian Zhang,^a Jianqiao He,^b Wei Chen,^a Chao Wang,^c Chong Zheng,^d Jianhua Lin,*^a Xia Zhang*^e and Fuqiang Huang*^ab

Author affiliations

* Corresponding authors

^a College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
E-mail: huangfq@pku.edu.cn

^b Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
E-mail: huangfq@mail.sic.ac.cn

^c College of Engineering, Peking University, Beijing 100871, China

^d Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115, USA

^e Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, China

Abstract

Microcrystalline Pb₂P₂S₆ powder was synthesized via a traditional melting salt method with KI or LiBr/KBr mixture (mole ratio is 3/2) acting as flux. The nanostructured Pb₂P₂S₆ powder was further synthesized by a high-speed ball milling technique. The Pb₂P₂S₆ powder was investigated by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), optical absorption (UV-vis) and photoluminescence measurements. The average particle size of the nanostructured Pb₂P₂S₆ powder changes from 500 to 60 nm when increasing the milling time from 0.5 h to 4 h. The optical properties of the Pb₂P₂S₆ powder show a size-dependence, with the band gap ranging from 2.56 eV to 2.88 eV. First-principle calculation reveal that the Pb₂P₂S₆ is a semiconductor with an indirect band gap of 2.15 eV. The size-dependent nature also makes the photoluminescence properties of the material tunable.

Article information

Submitted

03 Jun 2014

Accepted

30 Jul 2014

First published

30 Jul 2014

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RSC Adv., 2014,4, 34288-34293

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Paper

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Semiconductor Pb₂P₂S₆ and size-dependent band gap energy of its nanoparticles

X. Zhang, J. He, W. Chen, C. Wang, C. Zheng, J. Lin, X. Zhang and F. Huang, RSC Adv., 2014, 4, 34288

DOI: 10.1039/C4RA06663D

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Semiconductor Pb₂P₂S₆ and size-dependent band gap energy of its nanoparticles

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Semiconductor Pb₂P₂S₆ and size-dependent band gap energy of its nanoparticles

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