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Study of morphological and luminescent properties of HfO2 nanocrystals synthesized by precipitation method

Grant number: 19/20121-3
Support Opportunities:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): October 01, 2020
Effective date (End): November 30, 2023
Field of knowledge:Engineering - Electrical Engineering
Principal Investigator:Sonia Hatsue Tatumi
Grantee:Alvaro de Farias Soares
Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated scholarship(s):20/15562-8 - HfO2 luminescent properties and its dosimetry applications to ionizing radiation, BE.EP.DD


Thermoluminescence (TL) ionizing radiation dosimetry has been used since 1940 due to the pioneering study of Garlick & Gibson (1948). Since then, research has been carried out in the area, and currently researchers suggest the use Optically Stimulated Luminescence (OSL) of Alumina for dosimetry. The relevance of this branch is because detector materials are used to monitor doses received by workers in Nuclear Medicine, diagnostic and research centers, educational institutions, nuclear power plants, i.e., places with sources or devices that emit radiation, as well as in the environmental area. Therefore, such monitoring is essential and mandatory for public health welfare, and accurate and rapid determination of these doses is necessary in all respects, so the development of research into new materials for this area is of great importance. In this respect, a material that has gained focus in the literature, due to its properties, the Hafnium Oxide (HfO2). However, there are no studies on literature for OSL decay curves for this material, either pure or doped; TL emissions present different results according to the proposed synthesis method and type of dopant; moreover, some point out the sensitivity of the material to Ultraviolet (UV) radiation, radiation whose exposure can occur naturally by solar radiation, and artificially, as a medical, in the treatment of diseases by phototherapy,and more recently there is a proposal to disinfect medical facilities in hospitals and ICUs with UVC irradiation. In this way, the project aims to synthesize nanocrystals of pure HfO2 and doped with Ag (silver), analyze its morphological and luminescent properties, the influence of heat treatment and doping, and its application as a radiation detector, including UV. (AU)

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Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SOARES, Alvaro de Farias. Luminescence on HfO2 crystals: synthesis, heat treatment effect, related defects, and their application in ionising radiation dosimetry.. 2023. Doctoral Thesis - Universidade de São Paulo (USP). Escola Politécnica (EP/BC) São Paulo.

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