Morphology of InN nanorods using spectroscopic Raman imaging

Kishore K. Madapu; N. R. Ku; S. Dhara; C. P. Liu; A. K. Tyagi

doi:10.1002/jrs.4267

Morphology of InN nanorods using spectroscopic Raman imaging

Kishore K. Madapu, N. R. Ku, S. Dhara, C. P. Liu, A. K. Tyagi

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14 Citations (Scopus)

Abstract

We report the vibrational properties of vertical and oblique InN nanorods (NRs) grown by molecular beam epitaxy (MBE). Surface optical (SO) Raman mode at 561 cm^-1, belonging to E₁ symmetry [SO(E₁)], is identified along with symmetry allowed Raman modes of E₂(low), E₂(high), and E₁(LO) at 87, 489, and 589 cm^-1, respectively, corresponding to wurtzite InN phase. Usually, SO phonon modes arise due to breakdown of translational symmetry of surface potential at surface defects, which are attributed by the surface roughness. Intensity distribution of E₁(LO) and SO(E₁) phonon modes over a specified area have been analysed using Raman area mapping with an optical resolution of 400 nm. Imaging with E₁(LO) phonon mode, originating from the bulk of the sample, distinguishes the vertical NRs alone. We are able to resolve NR morphologies in both vertical and oblique cases with additional Raman mapping analysis of SO(E₁) phonon mode, emerging from the surface irregularities, which are confined to the tip of MBE grown NRs.

Original language	English
Pages (from-to)	791-794
Number of pages	4
Journal	Journal of Raman Spectroscopy
Volume	44
Issue number	5
DOIs	https://doi.org/10.1002/jrs.4267
Publication status	Published - 2013 May

All Science Journal Classification (ASJC) codes

General Materials Science
Spectroscopy

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@article{b37df25ceecd41dd803cf0e007c5cb8e,

title = "Morphology of InN nanorods using spectroscopic Raman imaging",

abstract = "We report the vibrational properties of vertical and oblique InN nanorods (NRs) grown by molecular beam epitaxy (MBE). Surface optical (SO) Raman mode at 561 cm-1, belonging to E1 symmetry [SO(E1)], is identified along with symmetry allowed Raman modes of E2(low), E2(high), and E1(LO) at 87, 489, and 589 cm-1, respectively, corresponding to wurtzite InN phase. Usually, SO phonon modes arise due to breakdown of translational symmetry of surface potential at surface defects, which are attributed by the surface roughness. Intensity distribution of E1(LO) and SO(E1) phonon modes over a specified area have been analysed using Raman area mapping with an optical resolution of 400 nm. Imaging with E1(LO) phonon mode, originating from the bulk of the sample, distinguishes the vertical NRs alone. We are able to resolve NR morphologies in both vertical and oblique cases with additional Raman mapping analysis of SO(E1) phonon mode, emerging from the surface irregularities, which are confined to the tip of MBE grown NRs.",

author = "Madapu, {Kishore K.} and Ku, {N. R.} and S. Dhara and Liu, {C. P.} and Tyagi, {A. K.}",

year = "2013",

month = may,

doi = "10.1002/jrs.4267",

language = "English",

volume = "44",

pages = "791--794",

journal = "Journal of Raman Spectroscopy",

issn = "0377-0486",

publisher = "John Wiley and Sons Ltd",

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TY - JOUR

T1 - Morphology of InN nanorods using spectroscopic Raman imaging

AU - Madapu, Kishore K.

AU - Ku, N. R.

AU - Dhara, S.

AU - Liu, C. P.

AU - Tyagi, A. K.

PY - 2013/5

Y1 - 2013/5

N2 - We report the vibrational properties of vertical and oblique InN nanorods (NRs) grown by molecular beam epitaxy (MBE). Surface optical (SO) Raman mode at 561 cm-1, belonging to E1 symmetry [SO(E1)], is identified along with symmetry allowed Raman modes of E2(low), E2(high), and E1(LO) at 87, 489, and 589 cm-1, respectively, corresponding to wurtzite InN phase. Usually, SO phonon modes arise due to breakdown of translational symmetry of surface potential at surface defects, which are attributed by the surface roughness. Intensity distribution of E1(LO) and SO(E1) phonon modes over a specified area have been analysed using Raman area mapping with an optical resolution of 400 nm. Imaging with E1(LO) phonon mode, originating from the bulk of the sample, distinguishes the vertical NRs alone. We are able to resolve NR morphologies in both vertical and oblique cases with additional Raman mapping analysis of SO(E1) phonon mode, emerging from the surface irregularities, which are confined to the tip of MBE grown NRs.

AB - We report the vibrational properties of vertical and oblique InN nanorods (NRs) grown by molecular beam epitaxy (MBE). Surface optical (SO) Raman mode at 561 cm-1, belonging to E1 symmetry [SO(E1)], is identified along with symmetry allowed Raman modes of E2(low), E2(high), and E1(LO) at 87, 489, and 589 cm-1, respectively, corresponding to wurtzite InN phase. Usually, SO phonon modes arise due to breakdown of translational symmetry of surface potential at surface defects, which are attributed by the surface roughness. Intensity distribution of E1(LO) and SO(E1) phonon modes over a specified area have been analysed using Raman area mapping with an optical resolution of 400 nm. Imaging with E1(LO) phonon mode, originating from the bulk of the sample, distinguishes the vertical NRs alone. We are able to resolve NR morphologies in both vertical and oblique cases with additional Raman mapping analysis of SO(E1) phonon mode, emerging from the surface irregularities, which are confined to the tip of MBE grown NRs.

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DO - 10.1002/jrs.4267

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JO - Journal of Raman Spectroscopy

JF - Journal of Raman Spectroscopy

IS - 5

ER -

Morphology of InN nanorods using spectroscopic Raman imaging

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