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Nanomaterials of sodium titanate: structure, morphology and photocatalytic and sensor properties

Grant number: 19/12114-7
Support type:Scholarships in Brazil - Master
Effective date (Start): September 01, 2019
Effective date (End): February 28, 2021
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Maria Aparecida Zaghete Bertochi
Grantee:Isabela Marcondelli Iani
Home Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
Associated research grant:13/07296-2 - CDMF - Center for the Development of Functional Materials, AP.CEPID


Nanotubes of sodium titanates have been shown to be important materials for photocatalytic applications, initially studied by the IC-FAPESP project (process 2017 / 24405-0), and by preliminary tests in applications such as O2 gas sensor. This material shows promising for technological applications, such as photocatalytic or sensor, due to phenomena related to electronic structure, charge transport mechanisms and surface defect states, which, however, are still not well defined due to the complex stoichiometry (NaxH2-xTi3O7, 0 e x e 2). The main idea in this work is to improve the process of obtaining the particles through the hydrothermal-assisted microwave method (HAM), and to characterize its structural, optical, electronic, and morphological properties in relation to the compositional variation between H+ and Na+, stipulating experimentally the relationship between the hydrogen-titanate and sodium titanate phases (H2Ti6O13 and Na2Ti6O13). With this relation we intend to evaluate and control the formation of the morphology in nanotubes, as well as to improve and evaluate the photocatalytic and sensor applications. With defect states created, a reconstruction of the energy bands is expected to occur, retarding the electron recombination hole and increasing the photocatalytic efficiency of the material. In addition, it is sought to study conditions that provide increased selectivity and sensitivity with respect to the sensor property of O2 gas. The obtained materials will be characterized by spectroscopic, diffraction and microscopy techniques, besides the photocatalytic tests and sensors.