ZnO Structures with Surface Nanoscale Interfaces Formed by Au, FeO, or CuO Modifier Nanoparticles : Characterization and Gas Sensing Properties
Tomic, Milena (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Claros, Martha (Brno University of Technology. Central European Institute of Technology)
Gràcia, Isabel (Institut de Microelectrònica de Barcelona)
Figueras Costa, Eduardo (Institut de Microelectrònica de Barcelona)
Cané, Carles (Institut de Microelectrònica de Barcelona)
Vallejos Vargas, Stella (Brno University of Technology. Central European Institute of Technology)

Date:	2021
Abstract:	Zinc oxide rod structures are synthetized and subsequently modified with Au, FeO, or CuO to form nanoscale interfaces at the rod surface. X-ray photoelectron spectroscopy corroborates the presence of Fe in the form of oxide-FeO; Cu in the form of two oxides-CuO and CuO, with the major presence of CuO; and Au in three oxidation states-Au 3+, Au +, and Au 0, with the content of metallic Au being the highest among the other states. These structures are tested towards nitrogen dioxide, ethanol, acetone, carbon monoxide, and toluene, finding a remarkable increase in the response and sensitivity of the Au-modified ZnO films, especially towards nitrogen dioxide and ethanol. The results for the Au-modified ZnO films report about 47 times higher response to 10 ppm of nitrogen dioxide as compared to the non-modified structures with a sensitivity of 39. 96% ppm −1 and a limit of detection of 26 ppb to this gas. These results are attributed to the cumulative effects of several factors, such as the presence of oxygen vacancies, the gas-sensing mechanism influenced by the nano-interfaces formed between ZnO and Au, and the catalytic nature of the Au nanoparticles.
Grants:	Agencia Estatal de Investigación PID2019-107697RB-C42
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Zinc oxide ; Gold ; Iron oxide ; Copper oxide ; Interfaces ; Schottky junctions ; Heterojunctions ; Gas sensing ; Nitrogen dioxide
Published in:	Sensors (Basel, Switzerland), Vol. 21, Issue 13 (June 2021) , art. 4509, ISSN 1424-8220

DOI: 10.3390/s21134509
PMID: 34209427

24 p, 10.6 MB

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