Revealing the local crystallinity of single silicon core-shell nanowires using tip-enhanced Raman spectroscopy

Marius van den Berg; Ardeshir Moeinian; Arne Kobald; Yu-Ting Chen; Anke Horneber; Steffen Strehle; Alfred J. Meixner; Dai Zhang

doi:10.3762/bxiv.2020.42.v1

Revealing the local crystallinity of single silicon core-shell nanowires using tip-enhanced Raman spectroscopy

Marius van den Berg ,
Ardeshir Moeinian ,
Arne Kobald ,
Yu-Ting Chen ,
Anke Horneber ,
Steffen Strehle ,
Alfred J. Meixner and
Dai Zhang

Submitting author affiliation:

Institute of Physical and Theoretical Chemistry, Eberhard Karls Universität Tübingen, Tübingen, Germany

Beilstein Arch. 2020, 202042. https://doi.org/10.3762/bxiv.2020.42.v1

Published 06 Apr 2020

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Read the peer-reviewed version of this preprint: https://doi.org/10.3762/bjnano.11.99

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Show All Preprints Nanotechnology Organic chemistry Bioorganic chemistry / chemical biology Catalysis Chemical methods and reactions Flow and process chemistry Green and sustainable chemistry Materials chemistry Medicinal and pharmaceutical chemistry Nano- and molecular-scale electronics Nano-biomaterials and bioscience Nanomagnetics Nanomaterials, thin films and nanointerfaces Nanomedicine Nanometrology and nanomechanics Nano-optics Nanopatterning, self-assembly and nanofabrication Nanostructures for energy and sensing applications Natural products chemistry Organo main group chemistry Other nanotechnology (unclassified) Other organic chemistry (unclassified) Photochemistry and photovoltaics Physical organic chemistry Supramolecular chemistry

Abstract

Tip-enhanced Raman spectroscopy is combined with polarization angle-resolved spectroscopy to investigate the nanometre-scale structural properties of core-shell silicon nanowires (crystalline Si core and amorphous Si shell), which were synthesized by platinum-catalyzed vapor-liquid-solid growth and silicon overcoating by thermal chemical vapour deposition. Local changes in the fraction of crystallinity are characterized for those silicon nanowires at an optical resolution of about 300 nm. Furthermore, we are able to resolve the variations in the intensity ratios between the crystalline Si and the amorphous Si Raman peaks by applying tip-enhanced Raman spectroscopy, at sample positions being eight nanometers apart. The local crystallinity revealed using confocal Raman spectroscopy and tip-enhanced Raman spectroscopy agree well with the high-resolution transmission electron microscopy measurements. Additionally, the polarizations of Raman scattering and the photoluminescence signal from the tip-sample nanogap are explored by combining polarization angle-resolved emission spectroscopy with tip-enhanced optical spectroscopy. Our work demonstrates the significant potential of resolving local structural properties of Si nanomaterials at the sub-10 nanometer scale using tip-enhanced Raman techniques.

Keywords: Tip-enhanced Raman spectroscopy; core-shell nanowire; silicon; polarization angle-resolved spectroscopy; local crystallinity

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When a peer-reviewed version of this preprint is available, this information will be updated in the information box above. If no peer-reviewed version is available, please cite this preprint using the following information:

van den Berg, M.; Moeinian, A.; Kobald, A.; Chen, Y.-T.; Horneber, A.; Strehle, S.; Meixner, A. J.; Zhang, D. Beilstein Arch. 2020, 202042. doi:10.3762/bxiv.2020.42.v1

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aromatic	the word “aromatic”
aromatic aldehyde	the word “aromatic” OR “aldehyde”
+aromatic +aldehyde	both words “aromatic” AND “aldehyde”
+aromatic -aldehyde	the word “aromatic” but NOT “aldehyde”
“aromatic aldehyde”	the exact phrase “aromatic aldehyde”
benz*	words which begin with “benz”, such as “benzene” or “benzyl”
benz*yl	words that begin with “benz” and end with “yl”, such as “benzyl” or “benzoyl”
benzyl~	words that are close to the word “benzyl”, such as “benzoyl” (i.e., fuzzy search)