题目：

Raman Spectroscopy of Two-Dimensional Bi₂TexSe_3−x Platelets Produced by Solvothermal Method

作者：

Jian Yuan ¹, Meng Zhao ², Wengzhi Yu ¹, Yao Lu ¹, Caiyun Chen ¹, Meng Xu ¹, Shaojuan Li ¹, Kian Ping Loh ² and QiaoliangBao ^1,3,*

单位：

¹ Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China;

² Department of Chemistry, and Graphene Research Centre, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore;

³ Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia

摘要：

In this paper, we report a facile solvothermal method to produce both binary and ternary compounds of bismuth chalcogenides in the form of Bi₂TexSe_3−x. The crystal morphology in terms of geometry and thickness as well as the stoichiometric ratio can be well controlled, which offers the opportunities to systematically investigate the relationship between microstructure and phonon scattering by Raman spectroscopy. Raman spectra of four compounds, i.e., Bi₂Se₃, Bi₂Se₂Te, Bi₂SeTe₂ and Bi₂Te₃, were collected at four different excitation photon energies (2.54, 2.41, 1.96, and 1.58 eV). It is found that the vibrational modes are shifted to higher frequency with more Se incorporation towards the replacement of Te. The dependence of Raman vibrational modes on excitation photon energy was investigated. As the excitation photon energy increases, three Raman vibrational modes (A1_g¹, E_g² and A1_g²) of the as-produced compounds move to low frequency. Three Infrared-active (IR-active) modes were observed in thin topological insulators (TIs) crystals.

影响因子：

2.651

分区情况：

2区

链接：

http://www.mdpi.com/1996-1944/8/8/5007/htm