| Grant number: | 18/08271-7 |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| Start date: | July 01, 2018 |
| End date: | June 30, 2019 |
| Field of knowledge: | Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials |
| Principal Investigator: | Diogo Paschoalini Volanti |
| Grantee: | Cecilia de Almeida Zito |
| Supervisor: | Dorota Koziej |
| Host 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 |
| Institution abroad: | Universität Hamburg (UHH), Germany |
| Associated to the scholarship: | 16/25267-8 - Graphene acid composites with hollow CeO2 and Pd-CeO2 yolk-shell structures applied as volatile organic compounds sensors, BP.DR |
Abstract This research proposal aims to promote an in-depth investigation of the structural, electronic, and chemical properties of gas-sensors based on graphene acid composites with yolk-shell cerium(IV) oxide (CeO2) and yolk-shell Pd-CeO2 nanospheres. Due to the easy conversion potential between Ce(III) and Ce(IV) oxidation states, oxygen vacancies defects can be created in the CeO2 crystal structure, which can enhance the gas-sensing sensitivity. However, there is a lack of studies which correlate the structural characteristics of CeO2 and its gas-sensing performance. Therefore, we propose the use of advanced synchrotron-related characterization techniques to provide reliable information about the materials structure. The Ce(IV)/Ce(III) system will be determined by high energy resolution fluorescence detected X-ray absorption near edge structure (HERFD-XANES) and resonant inelastic X-ray scattering (RIXS) spectroscopy. On the other hand, the existence of oxygen vacancies defects will be confirmed by extended X-ray absorption fine structure (EXAFS) measurements, and total scattering or pair distribution function (PDF) analysis. Therefore, the combination of HERFD-XANES, RIXS, EXAFS, and PDF techniques with the initial/previous characterization techniques, which have been performed in the principal institution, will be helpful to provide a depth association with the gas-sensing measurements, and consequently, propose a consistent gas-sensing mechanism. Finally, the relationship between the characterization and the observed gas sensor response may contribute to developing engineering strategies for effective gas sensors that could have potential technological applications. | |
| News published in Agência FAPESP Newsletter about the scholarship: | |
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