title: Sensors based on mesoporous SnO2-CuWO4with high selective sensitivity to H2S at low operating temperature.
abstract: Development of new sensitive materials by different synthesis routes in order to emphasize the sensing properties for hazardous H2S detection is one of a nowadays challenge in the field of gas sensors. In this study we obtained mesoporous SnO2-CuWO4with selective sensitivity to H2S by an inexpensive synthesis route with low environmental pollution level, using tripropylamine (TPA) as template and polyvinylpyrrolidone (PVP) as dispersant/stabilizer. In order to bring insights about the intrinsic properties, the powders were characterized by means of a variety of complementary techniques such as: X-Ray Diffraction, XRD; Transmission Electron Microscopy, TEM; High Resolution TEM, HRTEM; Raman Spectroscopy, RS; Porosity Analysis by N2adsorption/desorption, BET; Scanning Electron Microscopy, SEM and X-ray Photoelectron Spectroscopy, XPS. The sensors were fabricated by powders deposition via screen-printing technique onto planar commercial Al2O3substrates. The sensor signals towards H2S exposure at low operating temperature (100°C) reaches values from 105(for SnWCu600) to 106(for SnWCu800) over the full range of concentrations (5-30ppm). The recovery processes were induced by a short temperature trigger of 500°C. The selective sensitivity was underlined with respect to the H2S, relative to other potential pollutants and relative humidity (10-70% RH).
authors.affiliation: National Institute of Materials Physics, Atomistilor 405A, P.O. Box MG-7, 077125 Bucharest, Măgurele, Romania.
authors.forename: Adelina
authors.initials: A
authors.lastname: Stanoiu
authors.affiliation: National Institute of Materials Physics, Atomistilor 405A, P.O. Box MG-7, 077125 Bucharest, Măgurele, Romania.
authors.forename: Cristian E
authors.initials: CE
authors.lastname: Simion
authors.affiliation: "Ilie Murgulescu" Institute of Physical Chemistry, Romanian Academy, Surface Chemistry and Catalysis Laboratory, Spl. Independentei 202, 060021, Bucharest, Romania.
authors.forename: Jose Maria
authors.initials: JM
authors.lastname: Calderon-Moreno
authors.affiliation: "Ilie Murgulescu" Institute of Physical Chemistry, Romanian Academy, Surface Chemistry and Catalysis Laboratory, Spl. Independentei 202, 060021, Bucharest, Romania.
authors.forename: Petre
authors.initials: P
authors.lastname: Osiceanu
authors.affiliation: University of Bucharest, Faculty of Chemistry, Department of Organic Chemistry, Biochemistry and Catalysis, B-dul Regina Elisabeta 4-12, Bucharest, Romania; National Institute of Materials Physics, Atomistilor 405A, P.O. Box MG-7, 077125 Bucharest, Măgurele, Romania.
authors.forename: Mihaela
authors.initials: M
authors.lastname: Florea
authors.affiliation: National Institute of Materials Physics, Atomistilor 405A, P.O. Box MG-7, 077125 Bucharest, Măgurele, Romania.
authors.forename: Valentin S
authors.initials: VS
authors.lastname: Teodorescu
authors.affiliation: "Ilie Murgulescu" Institute of Physical Chemistry, Romanian Academy, Surface Chemistry and Catalysis Laboratory, Spl. Independentei 202, 060021, Bucharest, Romania. Electronic address: somacescu.simona@gmail.com.
authors.forename: Simona
authors.initials: S
authors.lastname: Somacescu
keywords: Controlled temperature trigger; H2S selective sensitivity; Intrinsic properties; Low operating temperature; Mesoporous SnO(2)-CuWO(4)