Raman selection rule for surface optical phonons in ZnS nanobelts

Chih-Hsiang Ho; Purushothaman Varadhan; Hsin-Hua Wang; Cheng-Ying Chen; Xiaosheng Fang; Jr-Hau He

doi:10.1039/c5nr07268a

Raman selection rule for surface optical phonons in ZnS nanobelts

Chih-Hsiang Ho, Purushothaman Varadhan, Hsin-Hua Wang, Cheng-Ying Chen, Xiaosheng Fang, Jr-Hau He^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

20 Citations (Scopus)

Abstract

We report Raman scattering results for high-quality wurtzite ZnS nanobelts (NBs) grown by chemical vapor deposition. In the Raman spectrum, the ensembles of ZnS NBs exhibit first order phonon modes at 274 cm^-1 and 350 cm^-1 , corresponding to A₁/E₁ transverse optical and A₁/E₁ longitudinal optical phonons, in addition to a strong surface optical (SO) phonon mode at 329 cm^-1. The existence of the SO band is confirmed by its shift with different surrounding dielectric media. Polarization dependent Raman spectra were recorded on a single ZnS NB and for the first time a SO phonon band has been detected on a single nanobelt. Different selection rules for the SO phonon mode are shown from their corresponding E₁/A₁ phonon modes, and were attributed to the breaking of anisotropic translational symmetry on the NB surface.

Original language	English
Pages (from-to)	5954-5958
Journal	Nanoscale
Volume	8
Issue number	11
Online published	18 Feb 2016
DOIs	https://doi.org/10.1039/c5nr07268a
Publication status	Published - 21 Mar 2016
Externally published	Yes

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title = "Raman selection rule for surface optical phonons in ZnS nanobelts",

abstract = "We report Raman scattering results for high-quality wurtzite ZnS nanobelts (NBs) grown by chemical vapor deposition. In the Raman spectrum, the ensembles of ZnS NBs exhibit first order phonon modes at 274 cm-1 and 350 cm-1 , corresponding to A1/E1 transverse optical and A1/E1 longitudinal optical phonons, in addition to a strong surface optical (SO) phonon mode at 329 cm-1. The existence of the SO band is confirmed by its shift with different surrounding dielectric media. Polarization dependent Raman spectra were recorded on a single ZnS NB and for the first time a SO phonon band has been detected on a single nanobelt. Different selection rules for the SO phonon mode are shown from their corresponding E1/A1 phonon modes, and were attributed to the breaking of anisotropic translational symmetry on the NB surface.",

author = "Chih-Hsiang Ho and Purushothaman Varadhan and Hsin-Hua Wang and Cheng-Ying Chen and Xiaosheng Fang and Jr-Hau He",

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T1 - Raman selection rule for surface optical phonons in ZnS nanobelts

AU - Ho, Chih-Hsiang

AU - Varadhan, Purushothaman

AU - Wang, Hsin-Hua

AU - Chen, Cheng-Ying

AU - Fang, Xiaosheng

AU - He, Jr-Hau

PY - 2016/3/21

Y1 - 2016/3/21

N2 - We report Raman scattering results for high-quality wurtzite ZnS nanobelts (NBs) grown by chemical vapor deposition. In the Raman spectrum, the ensembles of ZnS NBs exhibit first order phonon modes at 274 cm-1 and 350 cm-1 , corresponding to A1/E1 transverse optical and A1/E1 longitudinal optical phonons, in addition to a strong surface optical (SO) phonon mode at 329 cm-1. The existence of the SO band is confirmed by its shift with different surrounding dielectric media. Polarization dependent Raman spectra were recorded on a single ZnS NB and for the first time a SO phonon band has been detected on a single nanobelt. Different selection rules for the SO phonon mode are shown from their corresponding E1/A1 phonon modes, and were attributed to the breaking of anisotropic translational symmetry on the NB surface.

AB - We report Raman scattering results for high-quality wurtzite ZnS nanobelts (NBs) grown by chemical vapor deposition. In the Raman spectrum, the ensembles of ZnS NBs exhibit first order phonon modes at 274 cm-1 and 350 cm-1 , corresponding to A1/E1 transverse optical and A1/E1 longitudinal optical phonons, in addition to a strong surface optical (SO) phonon mode at 329 cm-1. The existence of the SO band is confirmed by its shift with different surrounding dielectric media. Polarization dependent Raman spectra were recorded on a single ZnS NB and for the first time a SO phonon band has been detected on a single nanobelt. Different selection rules for the SO phonon mode are shown from their corresponding E1/A1 phonon modes, and were attributed to the breaking of anisotropic translational symmetry on the NB surface.

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DO - 10.1039/c5nr07268a

M3 - RGC 21 - Publication in refereed journal

SN - 2040-3364

VL - 8

SP - 5954

EP - 5958

JO - Nanoscale

JF - Nanoscale

IS - 11

ER -

Raman selection rule for surface optical phonons in ZnS nanobelts

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