Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 157, Issue 1, Pages 169-176Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.03.045
Keywords
Palladium nanoparticles; Multi-walled carbon nanotube; Nanocomposite; Hydrogen sensor; Purification effect
Funding
- Consejo Nacional de Investigaciones Cientificas y Tecnicas [CONICET PIP 0183]
- Universidad de Buenos Aires [UBA-B041]
- Agencia Nacional de Promocion Cientifica y Tecnologica - Fondo para la Investigacion Cientifica y Tecnologica from Argentina [ANPCYT-FONCYT PICT 2131]
Ask authors/readers for more resources
Multi-walled carbon nanotubes (MWCNTs) are successfully processed in the form of thin films (buckypapers), and their morphology and electrical behaviour are characterized. The MWCNTs are synthesized by the floating catalyst chemical vapour deposition process. The effects of a sequence of treatments applied for MWCNTs purification on the buckypapers electrical behaviour are also examined. Nanocomposite thin films constituted of pristine and purified MWCNTs and Pd nanoparticles are prepared in order to evaluate their viability as H-2 sensors at room temperature. For this purpose, the electrical resistance of the nanocomposite films in atmospheres with different H-2 concentrations, is determined. Scanning electron microscopy (SEM) images show that the buckypapers and the nanocomposite films are 2D structures constituted by randomly oriented MWCNTs. The buckypapers present a semiconductor-like electrical behaviour as determined by the standard four point method. Room temperature resistivity values of around 10(-3) Omega m are assessed. Nanocomposite films show different electrical behaviour depending on the purification treatment applied to the MWCNTs employed. Furthermore, the electrical resistance of the nanocomposite films is found to increase when the measurements are performed in H-2 atmosphere. Values of H-2 sensitivity at room temperature of the nanocomposite films up to 2.15% are determined for H-2 average concentration higher than 350 ppm with short recovery time. (C) 2011 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available