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One-pot microwave-assisted hydrothermal synthesis of tungsten trioxide-reduced graphene oxide composites for detection acetone

Grant number: 15/04306-2
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): May 01, 2015
Effective date (End): December 31, 2015
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal Investigator: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 research project concerns the evaluation of the use of reduced graphene oxide (RGO) in tungsten trioxide (WO3) with monoclinic structure in the WO3-RGO composites to improve the sensitivity, selectivity and response time of the acetone sensors. The WO3-RGO composites are synthesized in one step from the dispersion containing a tungsten solution under controlled pH and graphene oxide dispersion (e.g. 0,5; 1,0; 1,5 e 2,0% wt) by microwave-assisted crystallization. RGO act as electron acceptor to facilitate WO3-acetone interactions and chemical interactions via pi-pi type, in addition to increasing the surface area of the composite. The main benefits of RGO consist in increasing the adsorption, sensitivity, reversibility and detection limits of the sensor process. All the synthesized composites will be characterized by structural techniques (X-ray diffraction), morphological (scanning and transmission electron microscopy), spectroscopic (FTIR-ATR), textural (surface area measurement) and thermal (TGA and DSC). The composite sensor responses will be assessed by electrical measurement (conductivity change) in the presence of acetone (ppms or ppbs), which can be correlated to the diagnosis of diseases, eg, diabetes. As a challenge, the composite shall be tested in similar conditions of high human breathing (relative humidity between 90 to 95%). This proposal has the support of FAPESP grant (nº 14/17343-0).

Scientific publications
(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)
PERFECTO, T. M.; ZITO, C. A.; VOLANTI, D. P. Room-temperature volatile organic compounds sensing based on WO3 center dot 0.33H(2)O, hexagonal-WO3, and their reduced graphene oxide composites. RSC ADVANCES, v. 6, n. 107, p. 105171-105179, 2016. Web of Science Citations: 15.

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