Raman selection rule of surface optical phonon in ZnS nanobelts

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

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We report Raman scattering results of high-quality wurtzite ZnS nanobelts (NBs) grown by chemical vapor deposition. In 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 with strong surface optical (SO) phonon mode at 329 cm-1. The existence of SO band is confirmed by its shift with different surrounding dielectric media. Polarization dependent Raman spectrum was performed on a single ZnS NB and for the first time SO phonon band has been detected on a single nanobelt. Different selection rules of SO phonon modeshown from their corresponding E1/A1 phonon modeswere attributed to the anisotropic translational symmetry breaking on the NB surface.
Original languageEnglish (US)
Pages (from-to)5954-5958
Number of pages5
JournalNanoscale
Volume8
Issue number11
DOIs
StatePublished - 2016

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