Flexible room-temperature volatile organic compound sensors based on reduced graphene oxide-WO3 center dot 0.33H(2)O nano-needles

Autor(es)

Perfecto, Tarcisio M. ^[1] ; Zito, Cecilia A. ^[1] ; Mazon, Talita ^[2] ; Volanti, Diogo P. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ Unsep, Lab Mat Sustainabil LabMatSus, Ibilce, R Cristova Colombo 2265, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

^[2] Ctr Informat Technol Renato Archer CTI, Rod D Pedro 1, KM 143, 6, BR-13069901 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MATERIALS CHEMISTRY C; v. 6, n. 11, p. 2822-2829, MAR 21 2018.
• Citações Web of Science: 7

Resumo

Flexible sensors have attracted significant attention due to their currently desirable properties and possibility to be applied to any surface and conditions such as wearable electronic devices. Therefore, we prepared volatile organic compound (VOC) sensors based on WO3 center dot 0.33H(2)O nano-needles and their composites with reduced graphene oxide (RGO) on flexible polyethylene terephthalate (PET) substrates. The materials were synthesized via a combination of the ultrasonic spray nozzle (USN) and microwave-assisted hydrothermal (M AH) methods to obtain a single WO3 center dot 0.33H(2)O orthorhombic crystalline phase. The VOC sensing properties of the materials deposited on PET electrodes were studied at room temperature (22 degrees C) and 55% relative humidity. The materials were exposed to acetone, ethanol, isopropanol, acetic acid, and methanol to determine their selectivity. The materials exhibited a good selectivity for isopropanol. The 5% RGO-WO3 center dot 0.33H(2)O composite presented a superior isopropanol-sensing performance, with a response of 4.96 to 100 ppm, which was similar to 1.6 times higher than that of the pure WO3 center dot 0.33H(2)O nano-needles. The materials behaved as p-type semiconductors due to an inversion of the sensitive layer promoted by the adsorption of water molecules on the surface of the material. (AU)

• 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
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 17/01267-1 - Compósitos de ácido grafênico-óxidos metálicos ocos para sensor de gás
• Beneficiário: Diogo Paschoalini Volanti
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/23886-4 - Estudo sobre seletividade de processos de hidrogenólise / hidrogenação redutiva do bagaço de cana em estado supercrítico catalisado por óxidos metálicos estruturados
• Beneficiário: Mauricio Boscolo
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 16/25267-8 - Compósitos de ácido grafênico com estruturas de CeO2 ocas e Pd-CeO2 do tipo gema-casca aplicados como sensores de compostos orgânicos voláteis
• Beneficiário: Cecilia de Almeida Zito
• Modalidade de apoio: Bolsas no Brasil - Doutorado