Discriminative detection of volatile organic compounds using an electronic nose based on TiO(2 )hybrid nanostructures

Autor(es)

Conti, Patrick P. ^{[1, 2]} ; Andre, Rafaela S. ^[2] ; Mercante, Luiza A. ^{[2, 3]} ; Fugikawa-Santos, Lucas ^[4] ; Correa, Daniel S. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Fed Univ Sao Carlos UFSCar, Ctr Exact Sci & Technol, Dept Chem, PPGQ, BR-13565905 Sao Carlos, SP - Brazil

^[2] Embrapa Instrumentacao, Nanotechnol Natl Lab Agr LNNA, BR-13560970 Sao Carlos, SP - Brazil

^[3] Fed Univ Bahia UFBA, Inst Chem, BR-40170280 Salvador, BA - Brazil

^[4] Sao Paulo State Univ UNESP, Inst Geosci & Exact Sci, Rio Claro, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SENSORS AND ACTUATORS B-CHEMICAL; v. 344, OCT 1 2021.
• Citações Web of Science: 1

Resumo

Volatile organic compounds (VOCs) are environmental pollutants that pose risks to the human health even at very low concentrations. Therefore, fast and sensitive analytical methods capable to discriminate VOCs are highly demanded. Herein, we have successfully synthetized and characterized TiO2 nanofibers (NF) by electrospinning and TiO2 nanoparticles (NP) by sol-gel method to be employed in an electronic nose (e-nose) for monitoring VOCs. Electrical comparison between TiO2-NF and TiO2-NP indicated that the former presented better electrical response, which can be attributed to the better charge transfer along the nanofiber framework. The TiO2 nanostructures were combined with three different polymers, namely poly(3,4ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), polypyrrole (PPy), and polystyrene sulfonate (PSS), which obtained nanocomposites were deposit by drop casting onto gold interdigitated electrodes and used as sensing units of the e-nose. Electrical impedance spectroscopy measurements were employed to collect the enose electrical resistance data, which were treated by Principal Component Analysis (PCA), revealing the system was able to discriminate the three VOCs. Our results indicate that the e-nose system has potential to be employed as a rapid and simple alternative in the detection of VOCs. (AU)

• Processo FAPESP: 18/08012-1 - Desenvolvimento de sensores nanoestruturados baseados em materiais cerâmicos e polímeros condutores para monitoramento de compostos orgânicos voláteis
• Beneficiário: Patrick Pires Conti
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 17/12174-4 - Desenvolvimento de nanofibras poliméricas híbridas para aplicação na agricultura
• Beneficiário: Daniel Souza Corrêa
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/23793-4 - Desenvolvimento de sensores nanoestruturados visando a detecção de compostos voláteis indicadores da qualidade de alimentos
• Beneficiário: Rafaela da Silveira Andre
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado