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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: JOURNAL OF MATERIALS CHEMISTRY C; v. 6, n. 11, p. 2822-2829, MAR 21 2018.
• Web of Science Citations: 7

Abstract

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)

• FAPESP's process: 16/04371-1 - Sensors based on reduced graphene oxide-WO3 and Ag-WO3 obtained by microwave-assisted ultrasonic spray and deposited on paper for detection of volatile organic compounds
• Grantee: Tarcísio Micheli Perfecto
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 17/01267-1 - Graphene acid-hollow metal oxides composites for gas sensor
• Grantee: Diogo Paschoalini Volanti
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/23886-4 - Study on selectivity of hydrogenolysis / reductive hydrogenation processes of sugarcane bagasse under supercritical state catalyzed by structured metal oxides
• Grantee: Mauricio Boscolo
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
• FAPESP's process: 16/25267-8 - Graphene acid composites with hollow CeO2 and Pd-CeO2 yolk-shell structures applied as volatile organic compounds sensors
• Grantee: Cecilia de Almeida Zito
• Support Opportunities: Scholarships in Brazil - Doctorate