Abstract
Optical characterization of DNA-wrapped CoMoCAT carbon nanotube hybrids (DNA-CNT) and semiconductor-enriched DNA-CNT was carried out using resonant Raman spectroscopy (RRS) and photoluminescence (PL) experiments. The values of radial breathing modes frequency ωRBM were found to be relatively insensitive to the type of wrapping agents surrounding the nanotube. The values of ωRBM and the first and second resonant interband transitions, E11 and E22, for a particular (n, m) tube for all sample types in RRS and PL measurements are found to correspond to the values obtained for SDS-dispersed nanotubes measured with PL, but with a shift in Eii ranging from 10 to 80 meV. The DNA-wrapping has shown not only to provide good isolation to the individual nanotube in a bundle, but the DNA wrapping mechanism for the CoMoCAT sample has also been shown to be diameter selective.
Original language | English (US) |
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Pages (from-to) | 296-301 |
Number of pages | 6 |
Journal | Chemical Physics Letters |
Volume | 397 |
Issue number | 4-6 |
DOIs | |
State | Published - Oct 21 2004 |
Funding
The experimental work was performed at the micro-Raman laboratory and semiconductor optics laboratory, Universidade Federal de Minas Gerais, Brazil, and was supported by FAPEMIG, CNPq and FINEP. The MIT authors acknowledge support under the Dupont-MIT Alliance and under NSF Grants DMR 01-16042 and INT 00-00408. R.S. acknowledges a Grant-in-Aid (Nos. 13440091 and 16076201) from Ministry of Education, Japan. Part of the experimental work was performed at the Boston University Photonics Center, operated in conjunction with their Department of Physics and the Department of Electrical and Computer Engineering. E.B. Barros acknowledges support from CAPES. The BU authors acknowledge support from NSF NIRT ECS-0210752. The Brazilian authors acknowledge support from the Instituto de Nanosciencias, Brazil.
ASJC Scopus subject areas
- General Physics and Astronomy
- Physical and Theoretical Chemistry