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Raman Spectroscopy of Two-Dimensional Bi2TexSe3 − x Platelets Produced by Solvothermal Method

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
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Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Jordi Sort
Materials 2015, 8(8), 5007-5017; https://doi.org/10.3390/ma8085007
Received: 26 May 2015 / Revised: 13 July 2015 / Accepted: 27 July 2015 / Published: 5 August 2015
In this paper, we report a facile solvothermal method to produce both binary and ternary compounds of bismuth chalcogenides in the form of Bi2TexSe3 − 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 (A1g1, Eg2 and A1g2) of the as-produced compounds move to low frequency. Three Infrared-active (IR-active) modes were observed in thin topological insulators (TIs) crystals. View Full-Text
Keywords: bismuth chalcogenide; solvothermal; stoichiometric ratio; Raman spectroscopy; infrared active bismuth chalcogenide; solvothermal; stoichiometric ratio; Raman spectroscopy; infrared active
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Yuan, J.; Zhao, M.; Yu, W.; Lu, Y.; Chen, C.; Xu, M.; Li, S.; Loh, K.P.; Qiaoliang, B. Raman Spectroscopy of Two-Dimensional Bi2TexSe3 − x Platelets Produced by Solvothermal Method. Materials 2015, 8, 5007-5017.

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