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Raman spectroscopy of optical transitions and vibrational energies of ~1 nm HgTe extreme nanowires within single walled carbon nanotubes

Raman spectroscopy of optical transitions and vibrational energies of ~1 nm HgTe extreme nanowires within single walled carbon nanotubes
Raman spectroscopy of optical transitions and vibrational energies of ~1 nm HgTe extreme nanowires within single walled carbon nanotubes
This paper presents a resonance Raman spectroscopy study of ~1 nm diameter HgTe nanowires formed inside single walled carbon nanotubes by melt infiltration. Raman spectra have been measured for ensembles of bundled filled tubes, produced using tubes from two separate sources, for excitation photon energies in the ranges 3.39–2.61 and 1.82–1.26 eV for Raman shifts down to ~25 cm–1. We also present HRTEM characterization of the tubes and the results of DFT calculations of the phonon and electronic dispersion relations, and the optical absorption spectrum based upon the observed structure of the HgTe nanowires. All of the evidence supports the hypothesis that the observed Raman features are not attributable to single walled carbon nanotubes, i.e., peaks due to radial breathing mode phonons, but are due to the HgTe nanowires. The observed additional features are due to four distinct phonons, with energies 47, 51, 94, and 115 cm–1, respectively, plus their overtones and combinations. All of these modes have strong photon energy resonances that maximize at around 1.76 eV energy with respect to incident laser.
1936-0851
9044-9052
Spencer, Joseph
4ae3c181-002e-491d-a9c3-8936062a49c8
Nesbitt, John
cdbbf2a8-da2b-473c-aac6-f3d062245685
Trewhitt, Harrison
fc193175-3db6-4043-b0f1-95ba1245d848
Kashtiban, Reza J.
2f6b0979-49ee-4e16-9c52-1ed7653c0485
Bell, Gavin
f071579f-5a2d-4782-965d-d7d22b8be6a3
Ivanov, Victor G.
4a7bf7fb-31b6-43d7-9ced-7eb782f29c32
Faulques, Eric
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Sloan, Jeremy
30ae48dd-fe5d-402c-bb7b-ea7b0af29b99
Smith, David
d9b2c02d-b7ea-498b-9ea1-208a1681536f
Spencer, Joseph
4ae3c181-002e-491d-a9c3-8936062a49c8
Nesbitt, John
cdbbf2a8-da2b-473c-aac6-f3d062245685
Trewhitt, Harrison
fc193175-3db6-4043-b0f1-95ba1245d848
Kashtiban, Reza J.
2f6b0979-49ee-4e16-9c52-1ed7653c0485
Bell, Gavin
f071579f-5a2d-4782-965d-d7d22b8be6a3
Ivanov, Victor G.
4a7bf7fb-31b6-43d7-9ced-7eb782f29c32
Faulques, Eric
22ecb715-3837-4156-835e-757e7d94fe4c
Sloan, Jeremy
30ae48dd-fe5d-402c-bb7b-ea7b0af29b99
Smith, David
d9b2c02d-b7ea-498b-9ea1-208a1681536f

Spencer, Joseph, Nesbitt, John and Trewhitt, Harrison et al. (2014) Raman spectroscopy of optical transitions and vibrational energies of ~1 nm HgTe extreme nanowires within single walled carbon nanotubes. ACS Nano, 8 (9), 9044-9052. (doi:10.1021/nn5023632).

Record type: Article

Abstract

This paper presents a resonance Raman spectroscopy study of ~1 nm diameter HgTe nanowires formed inside single walled carbon nanotubes by melt infiltration. Raman spectra have been measured for ensembles of bundled filled tubes, produced using tubes from two separate sources, for excitation photon energies in the ranges 3.39–2.61 and 1.82–1.26 eV for Raman shifts down to ~25 cm–1. We also present HRTEM characterization of the tubes and the results of DFT calculations of the phonon and electronic dispersion relations, and the optical absorption spectrum based upon the observed structure of the HgTe nanowires. All of the evidence supports the hypothesis that the observed Raman features are not attributable to single walled carbon nanotubes, i.e., peaks due to radial breathing mode phonons, but are due to the HgTe nanowires. The observed additional features are due to four distinct phonons, with energies 47, 51, 94, and 115 cm–1, respectively, plus their overtones and combinations. All of these modes have strong photon energy resonances that maximize at around 1.76 eV energy with respect to incident laser.

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HgTe@SWNT_ACSNano_Final.pdf - Accepted Manuscript
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Accepted/In Press date: 27 August 2014
e-pub ahead of print date: 27 August 2014
Published date: 27 August 2014
Organisations: Quantum, Light & Matter Group

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Local EPrints ID: 401309
URI: http://eprints.soton.ac.uk/id/eprint/401309
ISSN: 1936-0851
PURE UUID: 198c1341-ec1c-46c4-954a-a02b83d74ebd

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Date deposited: 10 Oct 2016 15:53
Last modified: 21 Nov 2021 03:55

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Contributors

Author: Joseph Spencer
Author: John Nesbitt
Author: Harrison Trewhitt
Author: Reza J. Kashtiban
Author: Gavin Bell
Author: Victor G. Ivanov
Author: Eric Faulques
Author: Jeremy Sloan
Author: David Smith

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