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Title: Enhanced photoluminescence in air-suspended carbon nanotubes by oxygen doping

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4964461· OSTI ID:1465769
 [1];  [1];  [1];  [2];  [2];  [3];  [4]
  1. Univ. of Southern California, Los Angeles, CA (United States). Ming Hsieh Dept. of Electrical Engineering
  2. Univ. of Southern California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
  3. Korea Polytechnic Univ., Shiheung-shi, Gyunggi-do (South Korea). Dept. of Mechatronics Engineering
  4. Univ. of Southern California, Los Angeles, CA (United States). Ming Hsieh Dept. of Electrical Engineering; Univ. of Southern California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
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We report photoluminescence (PL) imaging and spectroscopy of air-suspended carbon nanotubes (CNTs) before and after exposure to a brief (20 s) UV/ozone treatment. These spectra show enhanced PL intensities in 10 out of 11 nanotubes that were measured, by as much as 5-fold. This enhancement in the luminescence efficiency is caused by oxygen defects which trap excitons. We also observe an average 3-fold increase in the D-band Raman intensity further indicating the creation of defects. Previous demonstrations of oxygen doping have been carried out on surfactantcoated carbon nanotubes dissolved in solution, thus requiring substantial longer ozone/UV exposure times (~15 h). Here, the ozone treatment is more efficient because of the surface exposure of the air-suspended CNTs. In addition to enhanced PL intensities, we observe narrowing of the emission linewidth by 3–10 nm. Finally, this ability to control and engineer defects in CNTs is important for realizing several optoelectronic applications such as light-emitting diodes and single photon sources.

Research Organization:
Univ. of Southern California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Grant/Contract Number:
FG02-07ER46376
OSTI ID:
1465769
Alternate ID(s):
OSTI ID: 1328715
Journal Information:
Applied Physics Letters, Vol. 109, Issue 15; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

References (21)

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Cited By (1)

Scalable and Solid-State Redox Functionalization of Transparent Single-Walled Carbon Nanotube Films for Highly Efficient and Stable Solar Cells journal May 2017

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