Search results for " Thermal oxidation"

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Electronic Properties of Thermal Oxides on Ti and Their Influence on Impedance and Photoelectrochemical Behavior of TiO2 Nanotubes

2017

Thermal oxidation of titaniumwas carried out at 350◦C, 450◦C, and 550◦C for 2 h or 12 h.X-rayDiffraction and Raman Spectroscopy suggest that the thermal oxides are scarcely crystallinewhen the annealing temperature is low, while both anatase and rutile are present for high annealing temperature and time. Photoelectrochemical measurements allowed estimation of a bandgap decreasing from 3.35 eV to 3.15 eV with increasing annealing temperature. The impedance spectra confirmed the formation of n-type semiconductors, with an impedance strongly decreasing on going from a reverse bias toward a forward bias regime. TiO2 nanotubes grown by anodizing Ti in NH4F and water containing ethylene glycol so…

Materials scienceRenewable Energy Sustainability and the EnvironmentAnnealing anodizing Impedance photoelectrochemistry Thermal oxidation Ti TiO2 Nanotubes020209 energyNanotechnology02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsSettore ING-IND/23 - Chimica Fisica ApplicataThermal0202 electrical engineering electronic engineering information engineeringMaterials ChemistryElectrochemistry0210 nano-technologyElectrical impedanceElectronic properties
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