Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (7): 1430-1436.doi: 10.3866/PKU.WHXB201505112

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles    

Effect of HCl Post-Treatment on Morphology of Hydrothermally Prepared Titanate Nanomaterials with Optical Limiting Properties

SHI Chen-Yang, HE Hui-Bin, HONG Zan-Fa, ZHAN Hong-Bing, FENG Miao   

  1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, P. R. China
  • Received:2015-04-03 Revised:2015-05-11 Published:2015-07-08
  • Contact: FENG Miao E-mail:mfeng@fzu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51172045, 51402051), and Research Fund for the Doctoral Program of Higher Education of China (20113514120006).

Abstract:

The effect of post-treatment HCl concentration on titanate-titania transformation was investigated. Titanate was prepared by the alkaline hydrothermal treatment of TiO2, and then transformed to titania/titanate upon subsequent washing with 0.10-0.55 mol·L-1 HCl. The titanate almost completely transformed to rutile when treated with HCl concentrations>0.78 mol·L-1. Accompanying this phase transformation, the morphology of the sample changed from nanotubes to nanosheets and nanoparticles. This was related to the rate of phase transformation, which depended on the HCl concentration. Titanate became resolved into detached TiO6 octahedra during HCl treatment, and titanate-titania transformation occurred via rearrangement of the TiO6 octahedra. The phase transformation and morphological evolution were studied by X- ray diffraction, and transmission and scanning electron microscopies. The linear and nonlinear optical properties of the products were investigated using ultraviolet-visible absorption spectroscopy and the open aperture Z-scan technique, respectively. The minimum transmittance at Z=0 and maximum optical limiting effect were obtained when the HCl concentration was 0.55 mol·L-1. Different nonlinear optical effects were exhibited by different morphologies.

Key words: Acid treatment, Titanium dioxide, Morphology, Phase transformation, Nonlinear optical property

MSC2000: 

  • O642