http://scholars.ntou.edu.tw/handle/123456789/23016
Title: | Raman selection rule for surface optical phonons in ZnS nanobelts | Authors: | Xiaosheng Fang Chih-Hsiang Ho Purushothaman Varadhan Hsin-Hua Wang Cheng-Ying Chen Jr-Hau He |
Keywords: | MODES;SCATTERING;NANOWIRES;GAN | Issue Date: | Feb-2016 | Publisher: | The Royal Society of Chemistry | Journal Volume: | 8 | Journal Issue: | 44 | Start page/Pages: | 5954-5958 | Source: | Nanoscale | 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 A(1)/E-1 transverse optical and A(1)/E-1 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 E-1/A(1) phonon modes, and were attributed to the breaking of anisotropic translational symmetry on the NB surface. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/23016 | ISSN: | 2040-3364 | DOI: | 10.1039/C5NR07268A |
Appears in Collections: | 光電與材料科技學系 |
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