Volume 2019, Issue 6 p. 837-846
Full Paper

Easy and Green Route towards Nanostructured ZnO as an Active Sensing Material with Unexpected H2S Dosimeter-Type Behaviour

Stefano Diodati

Stefano Diodati

Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131- Padova and INSTM, UdR di Padova, Italy

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Jörg Hennemann

Jörg Hennemann

Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany

Institut für Angewandte Physik, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany

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Fernando Fresno

Fernando Fresno

Photoactivated Processes Unit, IMDEA Energy Institute, Avda. Ramón de la Sagra 3, 28935 Móstoles, Madrid, Spain

Laboratory for Environmental and Life Sciences, University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia

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Stefano Gialanella

Stefano Gialanella

Dipartimento di Ingegneria Industriale, Università degli Studi di Trento, Via Sommarive 9, I, -38123 Trento, Italy

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Paolo Dolcet

Paolo Dolcet

Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131- Padova and INSTM, UdR di Padova, Italy

Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstr. 20, 76133 Karlsruhe, Germany

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Urška Lavrenčič Štangar

Urška Lavrenčič Štangar

Laboratory for Environmental and Life Sciences, University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia

Faculty of Chemistry and Chemical Technology, University of Ljubljana, Vecna pot 113, 1000 Ljubljana, Slovenia

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Bernd M. Smarsly

Corresponding Author

Bernd M. Smarsly

Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany

Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany

E-mail: [email protected]

https://www.uni-giessen.de/faculties/f08/departments/physchem/ag-prof-dr-bernd-smarsly

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Silvia Gross

Corresponding Author

Silvia Gross

Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131- Padova and INSTM, UdR di Padova, Italy

Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany

E-mail: [email protected]

https://www.uni-giessen.de/faculties/f08/departments/physchem/ag-prof-dr-bernd-smarsly

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Dedicated to the memory of Professor Dieter Kohl (Justus-Liebig-Universität Gießen)
First published: 07 January 2019
Citations: 6

Graphical Abstract

Nanostructured ZnO was synthesised through a quick, easy, low-temperature and green hydrothermal route, showing an interesting gas-sensing behaviour. At an operation temperature of 450 °C, the material exhibits a significant response to H2S gas exposure as expected for a semiconducting n-type gas sensor. However, at an operating temperature of 150 °C the material shows gas dosimeter-type behaviour.

Abstract

Nanostructured ZnO particles were prepared through a straightforward, quick and low-temperature synthesis route involving coprecipitation of the metal precursor salts with oxalic acid, followed by hydrothermal treatment at 135 or 160 °C. The synthesised nanostructured powders were thoroughly characterised by a wide array of analytical techniques from the morphological (Scanning Electron Microscopy -SEM-, Transmission Electron Microscopy -TEM-, Energy-dispersive X-ray Spectroscopy -EDXS-), structural (Powder X-ray Diffraction -PXRD-, Selected Area Electron Diffraction -SAED-), compositional (X-ray Photoelectron Spectroscopy -XPS-) and physical (thermal stability) point of view. As far as functional applications are concerned, the powders were tested as gas sensor materials for H2S detection. Thereby these ZnO particles showed unexpected gas dosimeter behaviour at 150 °C. Based on these observations and on a comparison with literature a new model for the interaction of ZnO nanostructures with H2S is proposed.