Abstract
Changes in the optical properties of thermally coalesced single-walled carbon nanotubes (SWCNTs) caused by heat treatment between 1300 and 2800 °C in argon, have been monitored using optical absorption and photoluminescence spectroscopy. For SWNTs heat treated at 1900 °C, we found a complete disapperance of small-diameter tubes (<1.0 nm) as well as the appearance of enlarged, defective tubes. The decreased sp 2/sp 3 ratio for tubes heat treated below 2100 °C suggests that adjacent small-diameter SWNTs transform into energetically stable larger-diameter SWNTs by the presence of structural non sp 2 defects.
Original language | English (US) |
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Pages (from-to) | 3878-3883 |
Number of pages | 6 |
Journal | Journal of Nanoscience and Nanotechnology |
Volume | 10 |
Issue number | 6 |
DOIs | |
State | Published - Jun 2010 |
All Science Journal Classification (ASJC) codes
- Bioengineering
- Chemistry(all)
- Biomedical Engineering
- Materials Science(all)
- Condensed Matter Physics