Fabrication of nanometer-sized anatase particles by a pulsed laser ablation method

Abstract

TiO2 particles of <10 nm have been prepared by ablating a rutile target rod with a pulsed laser beam, which was assisted by the synchronized injection of an Ar–O2 mixture. By controlling the wavelength of laser beam, injecting pressure ( p) and O2 concentration in the gas mixture, ultrasmall anatase particles could be obtained. In the present work, λ=532 nm, p=5×105 Pa and O2 concentration <5% resulted in anatase particles of <6 nm.