Translator Disclaimer
27 August 2003 Gas desorption in single-wall carbon nanotube mats during vacuum annealing
Author Affiliations +
Abstract
We report the desorption characteristics of H2O, CO2, H2 and O2, and changes in electrical resistance, single walled carbon nanotube (SWNT) mats during vacuum annealing from room temperature to 873 K. H2O desorption at ~503 K coincides with a resistance decrease of ~ 2%, in agreement with theoretical calculations. CO2 and H2 desorption correspond to subsequent decreases in resistance at ~563, and 663 K respectively. Repeated gas exposures, after thermal desorption, result in reversible R-T characteristics, indicating the tunability of average electrical response of SWNT mats. Our results showing the lack of O2 desorption, and increased CO2 desorption after O2 exposure, show that oxygen is strongly chemisorbed to SWNT surfaces, and desorbs primarily as CO2 and CO. These results are of relevance for harnessing SWNT-based nano-structures for potential applications such as hydrogen storage and chemical sensors, where the resistance-temperature characteristics and gas adsorption phenomena are intimately related.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rory W. Leahy, Krishna Vijayamohanan, Pulickel M. Ajayan, Ganapathiraman Ramanath, and Werner J. Blau "Gas desorption in single-wall carbon nanotube mats during vacuum annealing", Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); https://doi.org/10.1117/12.463909
PROCEEDINGS
5 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

Individual SWNT based thermoelectric power chemical sensors
Proceedings of SPIE (October 10 2007)
Stability of GaAs photocathode
Proceedings of SPIE (August 11 1998)

Back to Top