Journal
LASER & PHOTONICS REVIEWS
Volume 15, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202100259
Keywords
carbon nanotube; energy transfer; excitonic population; long linear carbon chains; time-resolved Raman
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Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [277146847-CRC1238]
- National Natural Science Foundation of China [51902353, 22075240]
- Natural Science Foundation of Guangdong Province [2019A1515011227]
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Long linear carbon chains in carbon nanotubes exhibit unique properties, such as tunable direct energy gap and high Raman response cross section, with exciton relaxation dynamics occurring on a longer timescale. Strong coupling between the confined carbon chains and the nanotube host facilitates efficient energy transfer, as observed in the experimental study.
Long linear carbon chains are attracting intense interest arising from their remarkable properties, such as the tunable direct energy gap, the high mechanical hardness, and the high Raman response cross section, which would play a great role in their potential applications in future nanotechnology. Here the excitonic transitions and the associated relaxation dynamics of nanotube confined long linear carbon chains are comprehensively interrogated by using steady state and time-resolved Raman spectroscopies. The exciton relaxation dynamics of the confined carbon chains occurs on a hundred of picoseconds timescale, in strong contrast to the host dynamics that occurs on a few picoseconds' timescale. A prominent time-resolved Raman response is observed over a broad energy range extending from 1.2 to 2.8 eV, which includes the strong Raman resonance region around 2.2 eV. Strong coupling between the chain and the nanotube host is found from the dynamics at high excitation energies which provides clear evidence for an efficient energy transfer from the host carbon nanotube to the chain. The experimental study presents the first unique characterization of the long linear carbon chain exciton dynamics, providing indispensable knowledge for the understanding of the interactions between different carbon allotropes.
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