Optical investigation on sulfur-doping effects in titanium dioxide nanoparticles

• Published in: Applied physics. A, Materials science & processing Vol. 97; no. 1; pp. 243 - 248
• Main Authors: Wu, X. W., Wu, D. J., Liu, X. J.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.10.2009; Springer
• Subjects: Absorption spectra; Anatase; Characterization and Evaluation of Materials; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Machines; Manufacturing; Nanocrystals and nanoparticles; Nanoparticles; Nanotechnology; Optical and Electronic Materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Phases; Physics; Physics and Astronomy; Processes; Raman spectra; Rutile; Spectroscopy; Surfaces and Interfaces; Thin Films; Titanium dioxide; 61.72.uj; 78.67.Bf; 64.70.Nd; 82.50.-m; 81.05.Ea; Nanoparticles; Raman spectra; Sulfur additions; Phase transformations; Doping; Ultraviolet visible spectrum; Electronic density of states; Titanium oxide; Lattice parameters; Spectral line shift; Local density approximation
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-009-5212-4

The sulfur-doping (S-doping) effects in TiO 2 nanoparticles are investigated by means of Raman spectroscopy and UV–Vis spectroscopy with different S-doping levels (10 and 50%). Raman spectra indicate that the rutile and anatase phases dominate for the low S-doped (10%) and high S-doped (50%) TiO 2 nanoparticles, respectively. The variation of phase with different S-doping levels has been ascribed to the different S-doping processes into TiO 2 nanoparticles. In addition, an extra absorption band is observed in both the S-doped TiO 2 nanoparticles. With increasing S-doping level from 10 to 50%, the extra absorption band shows a blue-shift from 470 to 445 nm, which may be ascribed to the variation of phase from rutile to anatase for TiO 2 .