Oxide semiconducting nanotubes: novel synthetic strategies and optical and structural properties studies

• Grant number: 11/22098-7
• Support Opportunities: Regular Research Grants
• Start date: March 01, 2012
• End date: February 28, 2014
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Paulo Noronha Lisboa Filho
• Grantee: Paulo Noronha Lisboa Filho
• Host Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil

Abstract

Titanium dioxide nanotubes (TiO2) have been appointed as one of the most promising technology for solar energy conversion and environmental applications, mainly because it is an oxide of low cost material, chemically stable and environmentally harmless. Also, TiO2 has a wide gap, but it does not absorb in the visible region. Otherwise, UV light is responsible for the generation of electron-hole pairs, which induce chemical reactions on the surface of the material. In this sense, there is an increasing interest in the applications of TiO2 materials and doping with rare earths may improve its applications for absorption in regions with longer wavelengths. This project deals to the synthesis, morphological, optical properties and electronic structure of TiO2 nanotubes doped with different rare earths (Ce, Pr and Gd). The samples will be synthesized by two methods: a template synthesis and chemical synthesis. Prepared specimens will be studied by X-ray diffraction (XRD) associated with the Rietveld method, and morphological studies carried out by transmission electron microscopy (TEM). Chemical analysis of specimens will be performed by infrared spectroscopy (IRFT) spectroscopy and X-ray photoemission (XPS). For the analysis of the electronic structure and charge transfer processes will be employed techniques of ultraviolet photoelectron spectroscopy (UPS) and absorption spectroscopy in the UV-Vis. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ARRUDA, LARISA B.; SANTOS, CASSIO M.; ORLANDI, MARCELO O.; SCHREINER, WIDO H.; LISBOA-FILHO, PAULO N.. Formation and evolution of TiO2 nanotubes in alkaline synthesis. CERAMICS INTERNATIONAL, v. 41, n. 2, B, p. 2884-2891, MAR 2015. (11/22098-7)

CATTO, ARIADNE C.; DA SILVA, LUIS F.; BERNARDI, MARIA I. B.; LI, MAXIMO S.; LONGO, ELSON; LISBOA-FILHO, PAULO N.; NASCIMENTO, OTACIRO R.; MASTELARO, VALMOR R.. An investigation into the influence of zinc precursor on the microstructural, photoluminescence, and gas-sensing properties of ZnO nanoparticles. JOURNAL OF NANOPARTICLE RESEARCH, v. 16, n. 12, DEC 2014. (12/15170-6, 11/22098-7, 13/09573-3)

ARRUDA, LARISA B.; SANTOS, CASSIO M.; ORLANDI, MARCELO O.; SCHREINER, WIDO H.; LISBOA-FILHO, PAULO N.. Formation and evolution of TiO2 nanotubes in alkaline synthesis. CERAMICS INTERNATIONAL, v. 41, n. 2, p. 8-pg., 2015-03-01. (11/22098-7)