Gas desorption in single-wall carbon nanotube mats during vacuum annealing

Rory W. Leahy; Krishna Vijayamohanan; Pulickel M. Ajayan; Ganapathiraman Ramanath; Werner J. Blau

doi:10.1117/12.463909

27 August 2003 Gas desorption in single-wall carbon nanotube mats during vacuum annealing

Rory W. Leahy, Krishna Vijayamohanan, Pulickel M. Ajayan, Ganapathiraman Ramanath, Werner J. Blau

Proceedings Volume 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications; (2003) https://doi.org/10.1117/12.463909
Event: OPTO Ireland, 2002, Galway, Ireland

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.

Citation Download Citation

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available