Phase transformation of TiO2 nanoparticles by femtosecond laser ablation in aqueous solutions and deposition on conductive substrates. Issue 18 (27th April 2017)

• Record Type: Journal Article
• Authors: Russo, Paola; Liang, Robert; He, Rui Xiu; Zhou, Y. Norman
• Is Part Of: Nanoscale. Volume 9:Issue 18(2017)
• Page Start: 6167
• Page End: 6177
• Publication Date: 2017-04-27
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c7nr00201g
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Femtosecond laser ablation as a tool for the phase transformation and bandgap engineering of TiO2 nanoparticles. Abstract : Titanium dioxide (TiO2 ) is a wide bandgap semiconductor that is chemically stable, non-toxic, and economical compared to other semiconductors and has been implemented in a wide range of applications such as photocatalysis, photovoltaics, and memristors. In this work we studied the femtosecond laser ablation of titanium dioxide powders (P25) dispersed either in water or deposited onto a fluoride-doped tin oxide (FTO) substrate. The process was used as a route to induce the phase-transformation of TiO2 nanoparticles which was governed by laser parameters such as ablation time and power. It was observed that upon increase of the ablation time of TiO2 dispersion in water a bandgap widening occurred, leading to the possibility of bandgap engineering of TiO2 using controlled laser parameter profiles.