Abstract
We investigate the anti-Stokes Raman scattering of single carbyne chains confined inside double-walled carbon nanotubes. Individual chains are identified using tip-enhanced Raman scattering (TERS) and heated by resonant excitation with varying laser powers. We study the temperature dependence of carbyne's Raman spectrum and quantify the laser-induced heating based on the anti-Stokes/Stokes ratio. Due to its molecular size and its large Raman cross section, carbyne holds great promise for local temperature monitoring, with potential applications ranging from nanoelectronics to biology.
Highlights
Carbyne, the paradigmatic sp-hybridized and truly onedimensional allotrope of carbon,[1,2] has attracted significant interest due to its anticipated outstanding mechanical,[3] thermal,[4] and electronic[5] properties
Carbyne chains are synthesized inside double-walled carbon nanotubes (DWCNTs) by high-temperature annealing according to the procedure described by Shi et al.[20]
We make use of the nanoscale resolution provided by tip-enhanced Raman scattering (TERS)
Summary
The paradigmatic sp-hybridized and truly onedimensional allotrope of carbon,[1,2] has attracted significant interest due to its anticipated outstanding mechanical,[3] thermal,[4] and electronic[5] properties. The anti-Stokes scattering intensity is proportional to the phonon population n. The Stokes Raman scattering intensity is proportional to n + 1.25,28 For phonons with an energy larger than the thermal energy, phonon population numbers are very small (n ≪ 1). At room temperature, anti-Stokes signals of high-energy (
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