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Zigzag HgTe nanowires modify the electron–phonon interaction in chirality-refined single-walled carbon nanotubes
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Hu, Ziyi, Breeze, Ben, Kashtiban, Reza J., Sloan, Jeremy and Lloyd-Hughes, James (2022) Zigzag HgTe nanowires modify the electron–phonon interaction in chirality-refined single-walled carbon nanotubes. ACS Nano, 16 (4). pp. 6789-6800. doi:10.1021/acsnano.2c01647
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Official URL: http://dx.doi.org/10.1021/acsnano.2c01647
Abstract
Atomically thin nanowires (NWs) can be synthesized inside single-walled carbon nanotubes (SWCNTs) and feature unique crystal structures. Here we show that HgTe nanowires formed inside small-diameter (<1 nm) SWCNTs can advantageously alter the optical and electronic properties of the SWCNTs. Metallic purification of the filled SWCNTs was achieved by a gel column chromatography method, leading to an efficient extraction of the semiconducting and metallic portions with known chiralities. Electron microscopic imaging revealed that zigzag HgTe chains were the dominant NW geometry in both the semiconducting and metallic species. Equilibrium-state and ultrafast spectroscopy demonstrated that the coupled electron–phonon system was modified by the encapsulated HgTe NWs, in a way that varied with the chirality. For semiconducting SWCNTs with HgTe NWs, Auger relaxation processes were suppressed, leading to enhanced photoluminescence emission. In contrast, HgTe NWs enhanced the Auger relaxation rate of metallic SWCNTs and created faster phonon relaxation, providing experimental evidence that encapsulated atomic chains can suppress hot carrier effects and therefore boost electronic transport.
| Item Type: | Journal Article | ||||||||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
| Library of Congress Subject Headings (LCSH): | Carbon nanotubes, Semiconductors -- Recombination, Mercury cadmium tellurides -- Research, Laser spectroscopy, Nanowires | ||||||||||
| Journal or Publication Title: | ACS Nano | ||||||||||
| Publisher: | American Chemical Society | ||||||||||
| ISSN: | 1936-0851 | ||||||||||
| Official Date: | 26 April 2022 | ||||||||||
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| Volume: | 16 | ||||||||||
| Number: | 4 | ||||||||||
| Page Range: | pp. 6789-6800 | ||||||||||
| DOI: | 10.1021/acsnano.2c01647 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Open Access | ||||||||||
| RIOXX Funder/Project Grant: |
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