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Materials 2015, 8(10), 6677-6684; doi:10.3390/ma8105333

Ultrathin Gas Permeable Oxide Membranes for Chemical Sensing: Nanoporous Ta2O5 Test Study

1
Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4M1, Canada
2
Oak Ridge National Laboratory, Institute for Functional Imaging of Materials and Center for Nanophase Materials Sciences, Oak Ridge, TN 37831, USA
3
SENSOR Laboratory, Department of Information Engineering, Brescia University and CNR-INO, Brescia 25133, Italy
4
Department of Physics, Southern Illinois University at Carbondale, Carbondale, IL 62901, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Dusan Losic
Received: 24 August 2015 / Revised: 17 September 2015 / Accepted: 21 September 2015 / Published: 25 September 2015
(This article belongs to the Special Issue Nanostructured Materials for Chemical Sensing Applications)
View Full-Text   |   Download PDF [1552 KB, uploaded 4 November 2015]   |  

Abstract

Conductometric gas sensors made of gas permeable metal oxide ultrathin membranes can combine the functions of a selective filter, preconcentrator, and sensing element and thus can be particularly promising for the active sampling of diluted analytes. Here we report a case study of the electron transport and gas sensing properties of such a membrane made of nanoporous Ta2O5. These membranes demonstrated a noticeable chemical sensitivity toward ammonia, ethanol, and acetone at high temperatures above 400 °C. Different from traditional thin films, such gas permeable, ultrathin gas sensing elements can be made suspended enabling advanced architectures of ultrasensitive analytical systems operating at high temperatures and in harsh environments. View Full-Text
Keywords: Ta2O5; metal oxide; ultrathin membrane; gas sensor; gas permeability Ta2O5; metal oxide; ultrathin membrane; gas sensor; gas permeability
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Imbault, A.; Wang, Y.; Kruse, P.; Strelcov, E.; Comini, E.; Sberveglieri, G.; Kolmakov, A. Ultrathin Gas Permeable Oxide Membranes for Chemical Sensing: Nanoporous Ta2O5 Test Study. Materials 2015, 8, 6677-6684.

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