Full text
| |
| Author(s): |
Vinícius Ferreira Lopes
Total Authors: 1
|
| Document type: | Master's Dissertation |
| Press: | São José do Rio Preto. 2020-07-01. |
| Institution: | Universidade Estadual Paulista (Unesp). Instituto de Biociências Letras e Ciências Exatas. São José do Rio Preto |
| Defense date: | 2020-06-16 |
| Advisor: | Diogo Paschoalini Volanti |
| Abstract | |
The advancement in science and technology of volatile organic compounds (VOCs) sensors is essential for the sustainable development of functional materials. The master's thesis refers to the evaluation of the use of graphene oxide (GO) in metallic oxides (OM) type-n (V2O5) and type-p (Co3O4) to improve sensitivity, selectivity and the response time of the sensors. The GO had a modification being subjected to an oxidative process. The nano or microstructured OMs were prepared from its precursors. Finally, the GO-OM composites were prepared after the precursors were in suspension with the GO for 24 hours. The GO increased the gaseous adsorption of the compounds resulting in greater selectivity and sensitivity. On the other hand, the main benefits of the nanostructured and micro-structured structures of OMs would be the greater surface area of the material resulting in better gaseous properties, resulting in more active sites for adsorption of oxygen and analyte gas molecules. The sensory responses were evaluated in the presence of different concentrations (in the ppm and ppb ranges) of VOCs (e.g., acetone, acetaldehyde, ethanol, methanol, benzene, xylene and toluene) in a dry atmosphere. (AU) | |
| FAPESP's process: | 18/08562-1 - Volatile organic compounds sensors based on hollow CoO, Co3O4, VO2, V2O5 and their composites with graphene acid |
| Grantee: | Vinicius Ferreira Lopes |
| Support Opportunities: | Scholarships in Brazil - Master |