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

by Fang Zhou, Yujing Zhao, Weichang Zhou and Dongsheng Tang

Appl. Sci. 2018, 8(10), 1794; https://doi.org/10.3390/app8101794 - 1 Oct 2018

Cited by 24 | Viewed by 5636

_{2}

_{3}

has extensive application as thermoelectric materials. Here, large-scale Bi

_{2}

_{3}

single-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 [...] Read more.

_{2}

_{3}

has extensive application as thermoelectric materials. Here, large-scale Bi

_{2}

_{3}

single-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 Bi

_{2}

_{3}

nanoplates, 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 Bi

_{2}

_{3}

nanoplates. Both 2A

_{g}^{1}

and 1E

_{g}^{2}

modes 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 A

_{1 g}^{1}

, E

_{g}^{2}

, A

_{1 g}^{2}

modes were determined to be −1.258 × 10

^{- 2}

^{- 1}

/K, −1.385 × 10

^{- 2}

^{- 1}

/K, −2.363 × 10

^{- 2}

^{- 1}

/K, respectively. Such low temperature coefficient may favor the obtaining of a high figure of merit (ZT) and indicate that Bi

_{2}

_{3}

nanoplates were used as excellent candidates of thermoelectric materials. Full article

(This article belongs to the Section Nanotechnology and Applied Nanosciences)

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