Varela J.A. – TechConnect Briefs

Microwave-assisted hydrothermal synthesis of Cu-doped titanate nanotubes: photoluminescence and photocatalysis properties

Manfroi D.C., Andrade L.P., Cavalheiro A.A., Jos A.A., Teixeira G.F., Perazolli L.A., Varela J.A., Zaghete M.A., Universidade Estadual Paulista, BR

Alkali titanates have been intensively investigated mostly because of their properties. And the interest for transition metal doping of 1D titanate nanostructures is enormous, especially copper. In the present work we report the synthesis of [...]

Microwave-assisted hydrothermal synthesis of Cu-doped titanate nanotubes: photoluminescence and photocatalysis properties

Manfroi D.C., Andrade L.P., Cavalheiro A.A., Jos A.A., Teixeira G.F., Perazolli L.A., Varela J.A., Zaghete M.A., Universidade Estadual Paulista, BR

Alkali titanates have been intensively investigated mostly because of their properties. And the interest for transition metal doping of 1D titanate nanostructures is enormous, especially copper. In the present work we report the synthesis of [...]

Funcional lead-free composite

Teixeira G.F., de Oliveira J.A.M., Zaghete M.A., Longo E., Varela J.A., Chemistry Institute, UNESP- Araraquara, BR

In the work reported here was obtained a lead-free NaNbO3 / PVDF composite, starting from photoluminescent ceramics particles with 1D morphology obtained by microwave-assisted hydrothermal method. Photoluminescence spectrum of the NaNbO3 particles shown emission around [...]

ZnO nanorods decorated with Au nanoparticles applied as gas sensors

Gasparotto G., Mazon T., Gasparotto G., Silva R.A., Zaghete M.A., Perazolli L.A., Varela J.A., CTI, BR

Zinc oxide (ZnO) is a n-type semiconductor with energy band gap of 3:37 eV and a large binding energy of 60 meV at room temperature. ZnO nanostructures can be easily obtained with different morphologies by [...]

Crystallization and optical properties of CCTO thin films under pressure influence

Sequinel T., Tebcherani S.M., Varela J.A., Kubaski E.T., Oliveira L.H., Siu Li M., Universidade Estadual Paulista, BR

The goals of this work were to decrease the synthesis temperature of CCTO thin films using the pressure method, and to improve the homogeneity and density of the CCTO films in order to obtain better [...]

CdMoO4 synthesized by a microwave-assisted hydrothermal method and their photoluminescence and photocatality properties

de Moura A.P., Oliveira L.H., Xavier C.S., Rosa I.L.V., Li M.S., Longo E., Varela J.A., Universidade Estadual Paulista, BR

Metal molybdates had a high application potential in various fields such as photoluminescence, microwave applications, optical fibers, scintillator materials, humidity sensors, and catalysis. In this work CdMoO4 nanoparticles were obtained under hydrothermal conditions using microwave [...]

Microwave-assisted hydrothermal synthesis of ZnO powders with different reagents

Xavier C.S., de Moura A.P., Li M.S., Longo E., Varela J.A., Cava S., Universidade Federal de Pelotas, BR

Zinc oxide (ZnO) is an exceptionally important semiconductor with a direct wide band gap (3.37 eV) and large excitation binding energy (60 meV) at room temperature [1]. In this work, zinc oxide powders were synthesized [...]

Structural refinement and photoluminescence properties of cube-like (Ca1-xCux)TiO3 crystals synthesized by the microwave-hydrothermal method

Oliveira L.H., de Moura A.P., Cavalcante L.S., Gutierrez S.A., Longo E., Varela J.A., Universidade Federal de São Carlos, BR

In this work, (Ca1-xCux)TiO3 crystals with (x = 0, 0.01 and 0.02), were synthesized by the microwave-hydrothermal method at 140ºC for 32 min. The photo-physical properties were studied to analyze the influence of Cu2+ doping [...]