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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

Grant number: 16/04371-1
Support type:Scholarships in Brazil - Master
Effective date (Start): June 01, 2016
Effective date (End): March 31, 2018
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal researcher:Diogo Paschoalini Volanti
Grantee:Tarcísio Micheli Perfecto
Home Institution: Instituto de Biociências, Letras e Ciências Exatas (IBILCE). Universidade Estadual Paulista (UNESP). Campus de São José do Rio Preto. São José do Rio Preto , SP, Brazil


The advance of science and technology of sensors is of great importance for sustainable development of society, and some of the biggest problems are the manufacture of sensors with high performance at low operating temperatures and also reducing the cost of production. In this sense, this proposed research aims to study the effects of silver (Ag) and reduced graphene oxide (RGO) in composites with tungsten trioxide (WO3) for the detection of volatile organic compounds (VOCs) at room temperature in paper substrates. The Ag-WO3 composite will be obtained by photodeposition nanoparticles (NPs) of Ag in the WO3 surface previously prepared by ultrasonic spray synthesis method assisted by microwave (SUAM). Thus, the Ag NPs will work in electronic awareness of the WO3 surface due to a change in the oxidation state of Ag caused by redox reactions with VOCs. Already the RGO-WO3 type structures will be synthesized in a single step by SUAM method by reduction of graphite oxide (GO) to RGO. The function of RGO is to act as electron acceptor in the heterostructure, causing the change of the WO3 band gap to facilitate electronic conduction in the material. Thus, the benefits of Ag and RGO consist in increasing the adsorption process, sensitivity and reversibility of the sensor limits of detection, improving detection at room temperature. Both types of composites will be evaluated in the presence of different concentrations of VOCs (ex.: acetone, 2-butanone and toluene) by conductometric measurements. Therefore, the main challenges of the proposal are the synthesis of the materials by the new method SUAM; the production of sensors based on Ag-WO3 and RGO-WO3 deposited on the interdigital electrodes of graphite on paper, and finally, applying the VOCs detection at room temperature. Indeed, the studied materials may have potential for development of new sensors for noninvasive diagnosis of diseases correlated with VOC in breathing (eg .: diabetes, lung cancer and liver cancer). This proposal has the support of aid to regular research funded by FAPESP (14 / 17343-0).

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Scientific publications (7)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ZITO, CECILIA A.; PERFECTO, TARCISIO M.; OLIVEIRA, TAIS N. T.; VOLANTI, DIOGO P. Bicone-like ZnO structure as high-performance butanone sensor. Materials Letters, v. 223, p. 142-145, JUL 15 2018. Web of Science Citations: 0.
ZITO, CECILIA A.; PERFECTO, TARCISIO M.; FONSECA, CRISTIANE S.; VOLANTI, DIOGO P. Effective reduced graphene oxide sheets/hierarchical flower-like NiO composites for methanol sensing under high humidity. NEW JOURNAL OF CHEMISTRY, v. 42, n. 11, p. 8638-8645, JUN 7 2018. Web of Science Citations: 7.
PERFECTO, TARCISIO M.; ZITO, CECILIA A.; MAZON, TALITA; VOLANTI, DIOGO P. Flexible room-temperature volatile organic compound sensors based on reduced graphene oxide-WO3 center dot 0.33H(2)O nano-needles. JOURNAL OF MATERIALS CHEMISTRY C, v. 6, n. 11, p. 2822-2829, MAR 21 2018. Web of Science Citations: 7.
ZITO, CECILIA A.; PERFECTO, TARCISIO M.; VOLANTI, DIOGO P. Palladium-Loaded Hierarchical Flower-like Tin Dioxide Structure as Chemosensor Exhibiting High Ethanol Response in Humid Conditions. ADVANCED MATERIALS INTERFACES, v. 4, n. 22 NOV 23 2017. Web of Science Citations: 10.
ZITO, CECILIA A.; PERFECTO, TARCISIO M.; VOLANTI, DIOGO P. Impact of reduced graphene oxide on the ethanol sensing performance of hollow SnO2 nanoparticles under humid atmosphere. SENSORS AND ACTUATORS B-CHEMICAL, v. 244, p. 466-474, JUN 2017. Web of Science Citations: 48.
VESSALLI, BEATRIZ A.; ZITO, CECILIA A.; PERFECTO, TARCISIO M.; VOLANTI, DIOGO P.; MAZON, TALITA. ZnO nanorods/graphene oxide sheets prepared by chemical bath deposition for volatile organic compounds detection. Journal of Alloys and Compounds, v. 696, p. 996-1003, MAR 5 2017. Web of Science Citations: 25.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
PERFECTO, Tarcísio Micheli. Sensores à base de óxido de grafeno reduzido-WO3 e Ag-WO3 obtidos por spray ultrassônico assistido por micro-ondas e depositados em substratos flexíveis para detecção de compostos orgânicos voláteis. 2018. 69 f. Master's Dissertation - Universidade Estadual Paulista "Júlio de Mesquita Filho" Instituto de Biociências, Letras e Ciências Exatas..

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