Production of TiO₂ Nanotubes and Nanoparticles

Abstract

TiO2 nanotubes and nanoparticles were obtained by anodization of metallic Ti foil in a 0.5% HF, 1:7 acetic acid aqueous solution. Voltages of 23 and 35 V were applied and the anodization time was varied. Scanning Electron Microscope (SEM) and Raman scattering spectroscopy were utilized to analyze the obtained structures. It was observed that nanotubes with larger diameter are obtained for higher anodization voltages, also a morphology and crystalline phase dependency on anodization time, for a given voltage, were observed. Nanotubes with diameters in the 20nm to 90 nm range were obtained for different anodization times and voltages.

INVESTIGAÇÃO DOS PARÂMETROS FOTOELETROCATALÍTICOS DO m-BiVO4 NA OXIDAÇÃO DE GLICOSE

“…Assim, o potencial aplicado entre o eletrodo de trabalho (ET) onde é fixado o semicondutor e o eletrodo de referência (ER), faz com que os elétrons fotoexcitados fluam do eletrodo de trabalho ao contra-eletrodo (CE), diminuindo a recombinação e -/h + , aumentando o tempo de vida dos h + para que neles ocorram processos de oxidação, conforme ilustra a Figura 1 (BRUGNERA, 2009;FRAGA;PEREYRA;ALBERTIN, 2011;GARCÍA PÉREZ et al, 2011) .…”

Biochemical Sensors: Comparison of the Performance of TiO2, SnO2:F and ITO Used as the Main Sensing Element

“…Many materials are widely used in sensors, such as zinc oxide (ZnO) (3), pure tin oxide (SnO 2 ) (8), fluorine doped tin oxide (SnO 2 :F) (9), titanium dioxide (TiO 2 ) (10), among others. TiO 2 is a material with a large range of applications, due to its versatility (11), high refractive index, photo stability, and biocompatibility (12). These oxide thin films have been proposed for applications in sensors due to their extensive response range as a function of pH, as well as low cost and high sensitivity (13).…”