Surface optical Raman modes in InN nanostructures

TL;DR

This study investigates surface optical phonon modes in InN nanostructures using Raman spectroscopy, revealing additional peaks likely due to surface effects, with theoretical calculations supporting their identification.

Contribution

It reports the observation of new surface optical phonon modes in InN nanostructures and correlates experimental Raman peaks with theoretical calculations, advancing understanding of surface vibrational properties.

Findings

Detection of two new Raman peaks at 528 cm-1 and 560 cm-1

Correlation of these peaks with surface optical phonon modes

Discussion of enhanced intensities due to surface effects

Abstract

Raman spectroscopic investigations are carried out on one-dimensional nanostructures of InN,such as nanowires and nanobelts synthesized by chemical vapor deposition. In addition to the optical phonons allowed by symmetry; A1, E1 and E2(high) modes, two additional Raman peaks are observed around 528 cm-1 and 560 cm-1 for these nanostructures. Calculations for the frequencies of surface optical (SO) phonon modes in InN nanostructures yield values close to those of the new Raman modes. A possible reason for large intensities for SO modes in these nanostructures is also discussed.