High gas sensor performance of WO3 nanofibers prepared by electrospinning

Autor(es)

Morais, V, Paulo ; Suman, Pedro H. ^[1] ; Silva, Ranilson A. ^[1] ; Orlandi, Marcelo O. ^[1]

Afiliação do(s) autor(es)

^[1] Morais, Paulo, V, Sao Paulo State Univ UNESP, Dept Engn Phys & Math, BR-14800060 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 864, MAY 25 2021.
• Citações Web of Science: 0

Resumo

WO3 is a widely studied gas sensor material that commonly exhibits excellent sensitivity and selectivity toward NO2 detection. In this study, the influence of the heating rate on the thickness and grain size of WO3 nanofibers synthesized by electrospinning was evaluated. The materials were analyzed using XRD, Raman, and UV-Vis spectroscopies, as well as FEG-SEM, TG-DTA, and the BET method. Results showed that continuous nanofibers with particle size dependent on the heating rate were obtained at 500 degrees C. The gas sensing performance of WO3 nanofibers calcined at 10 degrees C/min (NF500-10) was investigated due to its higher surface area. NF500-10 device presented a high sensor signal for low and high NO2 concentrations at temperatures ranging from 150 degrees C to 300 degrees C. The sensor signals for 25 ppm of NO2 at 150 degrees C are substantially higher than those of several previous reports. Moreover, high selectivity against potential interferents (H-2 and CO) was observed at all operating temperatures. A sensing mechanism based on the interaction between NO2 molecules and the surface of the WO3 nanofibers was proposed to explain the high sensor response. In conclusion, WO3 nanofibers were found to be an attractive sensing material to detect both low and high NO2 concentrations with excellent selectivity. (C) 2021 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 17/26219-0 - Estudo de Sensores Químicos de Elemento Único a base de semicondutores de óxidos metálicos
• Beneficiário: Marcelo Ornaghi Orlandi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/20808-0 - Transistores de efeito de campo (FET) baseados em nanoestruturas semicondutoras 1D: impacto da modulação do sinal elétrico sobre a performance como sensor de gás
• Beneficiário: Pedro Henrique Suman
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado