碳掺杂α-S8的光学性质和弹性性质的第一性原理计算

doi:10.3866/PKU.WHXB201402251

物理化学学报 >> 2014, Vol. 30 >> Issue (5): 845-854.doi: 10.3866/PKU.WHXB201402251

碳掺杂α-S₈的光学性质和弹性性质的第一性原理计算

阮林伟¹, 朱玉俊¹, 裘灵光¹, 卢运祥²

1 安徽大学化学化工学院, 合肥230601;
2 华东理工大学化学系, 上海200237

收稿日期:2013-12-30 修回日期:2014-02-24 发布日期:2014-04-25
通讯作者: 朱玉俊，裘灵光 E-mail:y_jzhu@sina.com;lgqiu@ahu.edu.cn
基金资助:
国家自然科学基金（20971001，51002001，21371002）和安徽大学博士启动资金（02303319）资助项目

First-Principles Calculations of Optical and Elastic Properties of Carbon-Doped α-S₈

RUAN Lin-Wei¹, ZHU Yu-Jun¹, QIU Ling-Guang¹, LU Yu-Xiang²

1 College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China;
2 Department of Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China

Received:2013-12-30 Revised:2014-02-24 Published:2014-04-25
Contact: ZHU Yu-Jun, QIU Ling-Guang E-mail:y_jzhu@sina.com;lgqiu@ahu.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (20971001, 51002001, 21371002) and Anhui University Doctoral Scientific Research Foundation, China (02303319).

摘要/Abstract

摘要：

采用第一性原理研究了C原子在光催化剂α-S₈中掺杂后体系电子结构、能带结构、光学性质、弹性性质以及其各向异性的变化规律. 结果表明C原子在α-S₈中掺杂后新形成的C―S键键长变短、键的重叠布居数增加、电荷密度增加，表明新键的共价性变强. 掺杂结构的带隙为2.64 eV，比纯α-S₈的带隙小0.15 eV，表明掺杂后的结构导电性增强. 掺杂结构的光吸收波长延长至650 nm左右，极大地提高了α-S₈的光吸收效率. 弹性性质计算表明C掺杂后α-S₈的机械性能下降，但仍为脆性材料. 各向异性的研究表明掺杂后的材料各向异性增强.

关键词: α-S₈, 掺杂, Castep, 光学性质, 弹性性质

Abstract:

In this study, we performed a first-principles investigation of the rules governing changes in the electronic structure, band structure, optical properties, elastic properties, and anisotropy of an α-S₈ photocatalyst after carbon doping. It was shown that the bond length decreased, and the bond overlap population and charge density increased, with the formation of new C―S bonds, after doping. This indicated that the new bonds had enhanced covalence. The energy band gap of the doped structure was 2.64 eV, which is 0.15 eV lower than that of pure α-S₈, showing that doping increased the conductivity of α-S₈. The optical absorption spectrum of the doped system was extended to 650 nm, showing that the light absorption efficiency of α-S₈ was greatly enhanced. Calculations of the elastic properties showed that the mechanical capacity of carbon-doped α-S₈ decreased, but it remained brittle. The doped material had higher anisotropy.

Key words: α-S₈, Doping, Castep, Optical property, Elastic property

阮林伟, 朱玉俊, 裘灵光, 卢运祥. 碳掺杂α-S₈的光学性质和弹性性质的第一性原理计算[J]. 物理化学学报, 2014, 30(5), 845-854. doi: 10.3866/PKU.WHXB201402251

RUAN Lin-Wei, ZHU Yu-Jun, QIU Ling-Guang, LU Yu-Xiang. First-Principles Calculations of Optical and Elastic Properties of Carbon-Doped α-S₈[J]. Acta Phys. -Chim. Sin. 2014, 30(5), 845-854. doi: 10.3866/PKU.WHXB201402251

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201402251

https://www.whxb.pku.edu.cn/CN/Y2014/V30/I5/845

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碳掺杂α-S₈的光学性质和弹性性质的第一性原理计算

First-Principles Calculations of Optical and Elastic Properties of Carbon-Doped α-S₈

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