Carbon nanotube chirality determines properties of encapsulated linear carbon chain

Author(s)
Sebastian Heeg, Lei Shi, Lisa V. Poulikakos, Thomas Pichler, Lukas Novotny
Abstract

Long linear carbon chains (LLCCs) encapsulated inside double-walled carbon nanotubes (DWCNTs) are regarded as a promising realization of carbyne, the truly one- dimensional allotrope of carbon. While the electronic and vibronic properties of the encapsulated LLCC are expected to be influenced by its nanotube host, this dependence has not been investigated experimentally so far. Here we bridge this gap by studying individual LLCCs encapsulated in DWCNTs with tip-enhanced Raman scattering (TERS). We reveal that the nanotube host, characterized by its chirality, determines the vibronic and electronic properties of the encapsulated LLCC. By choice of chirality, the fundamental Raman mode (C-mode) of the chain is tunable by ~85 cm−1 and its band gap by ~0.5 eV, suggesting this one-dimensional hybrid system to be a promising building block for nanoscale optoelectronics. No length dependence of the chain's C-mode frequency is evident, making LLCCs a close to perfect representation of carbyne.

Organisation(s)
Electronic Properties of Materials
Journal
Nano Letters
Volume
18
Pages
5426–5431
No. of pages
6
ISSN
1530-6984
DOI
https://doi.org/10.1021/acs.nanolett.8b01681
Publication date
08-2018
Publication status
E-pub ahead of print
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/carbon-nanotube-chirality-determines-properties-of-encapsulated-linear-carbon-chain(fffbe208-c695-44d1-9506-c50e2b0cee24).html