Morphology modification of TiO2 film by adding ammonium nitrate in precursor sol

作者：Dong Rulin^*; Fang Min; Hirata Yoshihiro; Chen Zhidong; Jin Changchun

来源：Thin Solid Films, 2012, 522: 254-260.

DOI：10.1016/j.tsf.2012.08.028

• Titanium dioxide
• Thin films
• Ammonium nitrate
• Surface modification
• Sol-gel deposition

The surface morphology of TiO2 film was modified with pore or particle by adding ammonium nitrate into TiO2 precursor sol and controlling the humidity of air during drying of dip-coated TiO2 sol film over glass substrate. Water vapor in the surrounding air condenses to the coated sol film during drying process and decreases the compatibility between the precursor and the solvent. Introduction of ammonium nitrate into the TiO2 sol causes a further increase of interfacial tension, which results in the formation of different morphologies of TiO2 film due to a phase separation between the precursor and the solvent. The formation process of pores or particles in TiO2 film is closely related to the condensation rate of water vapor. The RMS roughness of TiO2 film is significantly increased after the surface is modified with pore or particle, and can be controlled by varying the coating times. Adding NH4NO3 into the precursor sol cannot only modify the surface morphology but can also cause N element doping into the TiO2 film.

• 出版日期2012-11-1
• 单位常州大学