title: 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.
authors: Department of Chemistry, University of Nebraska - Lincoln, Lincoln, NE 68588, USA.
authors: Alexey
authors: A
authors: Lipatov
authors: Alexey
authors: A
authors: Varezhnikov
authors: Peter
authors: P
authors: Wilson
authors: Victor
authors: V
authors: Sysoev
authors: Andrei
authors: A
authors: Kolmakov
authors: Alexander
authors: A
authors: Sinitskii
mesh_terms: D019840:2-Propanol / Q000032:analysis; D055664:Electrochemical Techniques; D004566:Electrodes; D000431:Ethanol / Q000032:analysis; D005740:Gases / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D000432:Methanol / Q000032:analysis; D010087:Oxides / Q000737:chemistry
chemical_list: D005740:Gases; D010087:Oxides; D000431:Ethanol; D006108:Graphite; D019840:2-Propanol; D000432:Methanol