Journal
NANO LETTERS
Volume 18, Issue 9, Pages 5426-5431Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b01681
Keywords
Linear carbon chains; carbyne; carbon nanotubes; Raman spectroscopy; TERS
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Funding
- Swiss National Science Foundation [200021_165841]
- ETH Zurich Career Seed Grant [SEED-16 17-1]
- Austrian Science Fund [P27769-N20]
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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 similar to 95 cm(-1) and its band gap by similar to 0.6 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.
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