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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

ZnO nanorods/graphene oxide sheets prepared by chemical bath deposition for volatile organic compounds detection

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Autor(es):
Vessalli, Beatriz A. ; Zito, Cecilia A. ; Perfecto, Tarcisio M. ; Volanti, Diogo P. ; Mazon, Talita
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: Journal of Alloys and Compounds; v. 696, p. 996-1003, MAR 5 2017.
Citações Web of Science: 25
Resumo

Graphene-based composites have emerged as gas sensor due to the possibility to obtain higher surface area with additional functional groups. In this paper, ZnO nanorods (ZnO-NR) with controlled size and morphology were grown via chemical bath deposition in mild temperature (90 degrees C) over gold interdigital tracks deposited on an alumina substrate. Furthermore, it was also possible to obtain by the same method composites with graphene oxide sheets below ZnO-NR structures (GO/ZnO-NR) or ZnO-NR between GO sheets (GO/ZnO-NR/GO) when GO is placed in the bath during the growth of GO/ZnO-NR. The samples were characterized by Raman spectroscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy. These structures were tested as sensors of volatile organic compounds (VOCs), such as acetone, benzene, ethanol and methanol in the concentration range of 10-500 parts per million (ppm). It was found that the optimum working temperature of all sensors was 450 degrees C. The GO/ZnO-NR/GO composite showed better selectivity due to GO functional groups. In the case of our well-designed sensors, we found that the dominant oxygen species (O2-) on ZnO-NR surface were responsible for the sensors response. These findings offer a new viewpoint for further advance of the sensing performance of one-dimensional ZnO/GO nanocomposites VOCs sensors. (C) 2016 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 14/17343-0 - Efeito de metais catalisadores ou óxido de grafeno reduzido em óxidos metálicos semicondutores para detecção de compostos orgânicos voláteis
Beneficiário:Diogo Paschoalini Volanti
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 15/05916-9 - Sinergia entre Pd-SnO2 ou óxido de grafeno reduzido-SnO2 para detecção de compostos orgânicos voláteis na presença de umidade
Beneficiário:Cecilia de Almeida Zito
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 16/04371-1 - Sensores à base de óxido de grafeno reduzido-WO3 e Ag-WO3 obtidos por spray ultrassônico assistido por micro-ondas e depositados em papel para detecção de compostos orgânicos voláteis
Beneficiário:Tarcísio Micheli Perfecto
Linha de fomento: Bolsas no Brasil - Mestrado