ScholarWorks@UNO

Title

Towards One Key to One Lock: Catalyst Modified Indium Oxide Nanoparticle Thin Film Sensor Array for Selective Gas Detection

Authors

Kun Yao, Advanced Materials Research Institute, University of New OrleansFollow
Daniela Caruntu, University of New OrleansFollow
Sarah Wozny, University of New Orleans
Rong Huang, Nanostructures Research Laboratory, Japan Fine Ceramics Center
Yumi H. Ikuhara, Nanostructures Research Laboratory, Japan Fine Ceramics Center
Baobao Cao, Advanced Materials Research Institute, University of New OrleansFollow
Charles J. O'Connor, University of New OrleansFollow
Weilie Zhou, University of New OrleansFollow

Document Type

Article

Publication Date

3-5-2012

Abstract

Homogeneous In2O3 nanoparticles (NPs) were self-assembled into thin film sensor arrays on a single chip, with further surface modification by noble metal catalysts. The NP film sensor arrays show clear current responses when exposed to different target gases, and both sensitivity and selectivity were greatly improved. Particularly, the sensors modified with Au, Pd, and Pt nanocatalysts demonstrated higher sensitivity to H2S, H-2 and CO, respectively, making the gas discrimination direct and simple, like "one key to one lock". The particle size dependence of the noble metal modifiers to the sensitivity was further investigated by tuning the sputtering parameters. Three different trends of sensitivities were observed, each attributed to different mechanisms. The modified nanoparticle film sensor was also fabricated on flexible substrates and the sensing performance was investigated at different bending angles.

Journal Name

Journal of Materials Chemistry

Comments

Distributed with permission of the Royal Society of Chemistry. Restrictions on re-use and further distribution apply.

http://pubs.rsc.org/en/content/articlelanding/2012/jm/c2jm15179k

DOI: 10.1039/C2JM15179K

Recommended Citation

K. Yao, D. Caruntu, S. Wozny, R. Huang, Y.H. Ikuhara, B. Cao, C.J. O’Connor and W. Zhou, “Towards one key to one lock: catalyst modified indium oxide nanoparticle thin film sensor array for selective gas detection,” J. Mater. Chem., 2012: 22, 7308.