skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Quasiphase Transition in a Single File of Water Molecules Encapsulated in (6,5) Carbon Nanotubes Observed by Temperature-Dependent Photoluminescence Spectroscopy

Authors:
; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1339189
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 2; Related Information: CHORUS Timestamp: 2017-06-25 04:12:45; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Ma, Xuedan, Cambré, Sofie, Wenseleers, Wim, Doorn, Stephen K., and Htoon, Han. Quasiphase Transition in a Single File of Water Molecules Encapsulated in (6,5) Carbon Nanotubes Observed by Temperature-Dependent Photoluminescence Spectroscopy. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.027402.
Ma, Xuedan, Cambré, Sofie, Wenseleers, Wim, Doorn, Stephen K., & Htoon, Han. Quasiphase Transition in a Single File of Water Molecules Encapsulated in (6,5) Carbon Nanotubes Observed by Temperature-Dependent Photoluminescence Spectroscopy. United States. doi:10.1103/PhysRevLett.118.027402.
Ma, Xuedan, Cambré, Sofie, Wenseleers, Wim, Doorn, Stephen K., and Htoon, Han. Thu . "Quasiphase Transition in a Single File of Water Molecules Encapsulated in (6,5) Carbon Nanotubes Observed by Temperature-Dependent Photoluminescence Spectroscopy". United States. doi:10.1103/PhysRevLett.118.027402.
@article{osti_1339189,
title = {Quasiphase Transition in a Single File of Water Molecules Encapsulated in (6,5) Carbon Nanotubes Observed by Temperature-Dependent Photoluminescence Spectroscopy},
author = {Ma, Xuedan and Cambré, Sofie and Wenseleers, Wim and Doorn, Stephen K. and Htoon, Han},
abstractNote = {},
doi = {10.1103/PhysRevLett.118.027402},
journal = {Physical Review Letters},
number = 2,
volume = 118,
place = {United States},
year = {Thu Jan 12 00:00:00 EST 2017},
month = {Thu Jan 12 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevLett.118.027402

Citation Metrics:
Cited by: 3works
Citation information provided by
Web of Science

Save / Share:
  • A detailed knowledge of the manifold of both bright and dark excitons in single-walled carbon nanotubes (SWCNTs) is critical to understanding radiative and nonradiative recombination processes. Exciton-phonon coupling opens up additional absorption and emission channels, some of which may 'brighten' the sidebands of optically forbidden (dark) excitonic transitions in optical spectra. In this report, we compare {sup 12}C and {sup 13}C-labeled SWCNTs that are highly enriched in the (6,5) species to identify both absorptive and emissive vibronic transitions. We find two vibronic sidebands near the bright {sup 1}E{sub 11} singlet exciton, one absorptive sideband {approx}200 meV above, and one emissivemore » sideband {approx}140 meV below, the bright singlet exciton. Both sidebands demonstrate a {approx}50 cm{sup -1} isotope-induced shift, which is commensurate with exciton-phonon coupling involving phonons of A'{sub 1} symmetry (D band, {omega} {approx} 1330 cm{sup -1}). Independent analysis of each sideband indicates that both sidebands arise from the same dark exciton level, which lies at an energy approximately 25 meV above the bright singlet exciton. Our observations support the recent prediction of, and mounting experimental evidence for, the dark K-momentum singlet exciton lying {approx}25 meV (for the (6,5) SWCNT) above the bright {Lambda}-momentum singlet. This study represents the first use of {sup 13}C-labeled SWCNTs highly enriched in a single nanotube species to unequivocally confirm these sidebands as vibronic sidebands of the dark K-momentum singlet exciton.« less
  • Photoluminescence spectra of single-walled carbon nanotubes (SWCNTs) have been recorded and analyzed for selected individual nanotubes and structurally sorted bulk samples to clarify the nature of secondary emission features. Room temperature spectra show, in addition to the main peak arising from the E 11 bright exciton, three features at lower frequency, which are identified here (in descending order of energy difference from E 11 emission) as G 1, X 1, and Y 1. The weakest (G 1) is interpreted as a vibrational satellite of E 11 involving excitation of the ~1600 cm -1 G mode. The X 1 feature, althoughmore » more intense than G 1, has a peak amplitude only ~3% of E 11. X 1 emission was found to be polarized parallel to E 11 and to be separated from that peak by 1068 cm -1 in SWCNTs with natural isotopic abundance. The separation remained unchanged for several ( n,m) species, different nanotube environments, and various levels of induced axial strain. In 13C SWCNTs, the spectral separation decreased to 1023 cm -1. The measured isotopic shift points to a phonon-assisted transition that excites the D vibration. This supports prior interpretations of the X 1 band as emission from the dark K-momentum exciton, whose energy we find to be ~230 cm -1 above E 11. The remaining sideband, Y 1, is red-shifted ~300 cm -1 from E 11 and varies in relative intensity among and within individual SWCNTs. We assign it as defect-induced emission, either from an extrinsic state or from a brightened triplet state. In contrast to single-nanotube spectra, bulk samples show asymmetric zero-phonon E 11 peaks, with widths inversely related to SWCNT diameter. As a result, an empirical expression for this dependence is presented to aid the simulation of overlapped emission spectra during quantitative fluorimetric analysis of bulk SWCNT samples.« less
  • No abstract prepared.