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Bi2    Se3has extensive application as thermoelectric materials. Here, large-scale Bi2    Se3single-crystal hexagonal nanoplates with size 7.50–10.0    μ   m were synthesized successfully by hydrothermal method. X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM) were used to characterize the Bi2    Se3nanoplates, which confirm the single-crystal quality and smooth surface morphology with large size. Micro-Raman spectra over a temperature range of 83–603 K were furthermore used to investigate the lattice dynamics of Bi2    Se3nanoplates. Both 2Ag 1and 1Eg 2modes shift evidently with reduced temperature. The line shape demonstrates a significant broadening of full width at half maximum (FWHM) and red-shift of frequency with increased temperature. The temperature coefficient of A1 g  1    , Eg 2    , A1 g  2modes were determined to be −1.258 × 10− 2cm− 1/K, −1.385 × 10− 2cm− 1/K, −2.363 × 10− 2cm− 1/K, respectively. Such low temperature coefficient may favor the obtaining of a high figure of merit (ZT) and indicate that Bi2    Se3nanoplates were used as excellent candidates of thermoelectric materials.

Temperature-Dependent Raman Scattering of Large Size Hexagonal Bi2Se3 Single-Crystal Nanoplates