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Non-equilibrium Growth Processes of Porous TiO2 Nanocrystal-films during Pulsed Laser Ablation

Published online by Cambridge University Press:  10 April 2013

Ikurou Umezu ,
Nobuyasu Yagi ,
Akira Sugimura  and
Takehito Yoshida
Ikurou Umezu
Affiliation:
Department of Physics, Konan University, Kobe 658-8501, Japan
Nobuyasu Yagi
Affiliation:
Department of Physics, Konan University, Kobe 658-8501, Japan
Akira Sugimura
Affiliation:
Department of Physics, Konan University, Kobe 658-8501, Japan
Takehito Yoshida
Affiliation:
Department of Mechanical Engineering, Anan National College of Technology, Anan 774-0017, Japan
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Abstract

We performed pulsed laser ablation of titanium dioxide (TiO2) target in O2 background gas. Effects of background gas pressure and substrate target distance on the structure of deposited films are clarified. The hierarchical structures are observed when we change scale of observation. The film deposited on the substrate is composed of primary nanocrystal and secondary porous-aggregated-nanostructures. The primary nanocrystal changes from anatase to rutile phase with increasing background gas pressure or substrate target distance. The porosity of secondary aggregated structure increases with increasing background gas pressure or substrate target distance. The similarity between the effects of background gas and substrate target distance indicates that confinement of the plume between target and substrate is important for structural formation. The non-equilibrium aggregation processes of nanocrystals in the plume and on the substrate are essential for the hierarchical structure of the nanocrystal film.

Keywords

nanostructurecrystal growthlaser ablation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1497: Symposium K – Hierarchically Structured Materials for Energy Conversion and Storage , 2013 , mrsf12-1497-k03-20
Copyright
Copyright © Materials Research Society 2013

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