Issue 12, 2013

Highly selective gas sensor arrays based on thermally reduced graphene oxide

Abstract

The electrical properties of reduced graphene oxide (rGO) have been previously shown to be very sensitive to surface adsorbates, thus making rGO a very promising platform for highly sensitive gas sensors. However, poor selectivity of rGO-based gas sensors remains a major problem for their practical use. In this paper, we address the selectivity problem by employing an array of rGO-based integrated sensors instead of focusing on the performance of a single sensing element. Each rGO-based device in such an array has a unique sensor response due to the irregular structure of rGO films at different levels of organization, ranging from nanoscale to macroscale. The resulting rGO-based gas sensing system could reliably recognize analytes of nearly the same chemical nature. In our experiments rGO-based sensor arrays demonstrated a high selectivity that was sufficient to discriminate between different alcohols, such as methanol, ethanol and isopropanol, at a 100% success rate. We also discuss a possible sensing mechanism that provides the basis for analyte differentiation.

Graphical abstract: Highly selective gas sensor arrays based on thermally reduced graphene oxide

Article information

Article type
Paper
Submitted
11 Feb 2013
Accepted
10 Apr 2013
First published
12 Apr 2013

Nanoscale, 2013,5, 5426-5434

Highly selective gas sensor arrays based on thermally reduced graphene oxide

A. Lipatov, A. Varezhnikov, P. Wilson, V. Sysoev, A. Kolmakov and A. Sinitskii, Nanoscale, 2013, 5, 5426 DOI: 10.1039/C3NR00747B

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