Programming Surface Morphology of TiO2 Hollow Spheres and Their Superhydrophilic Films

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• 作者：Bo Peng ; Longfei Tan ; Dong Chen ; Xianwei Meng ; Fangqiong Tang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：January 25, 2012
• 年：2012
• 卷：4
• 期：1
• 页码：96-101
• 全文大小：341K
• 年卷期：v.4,no.1(January 25, 2012)
• ISSN：1944-8252

文摘

Long-term stable superhydrophilic films without UV irradiation consisting of hierarchical raspberrylike metal-ion-doped TiO₂ hollow spheres were fabricated by a simple spinning-coat method. The hierarchical surface morphology of metal-ion-doped TiO₂ hollow spheres can be programmed from 鈥渟mooth鈥? 鈥渕oderate roughness鈥?to 鈥渞oughness鈥?by adjusting the molar ratio of Co²⁺ ions to Zn²⁺ ions. Our results show that the substitution Co²⁺ and Zn²⁺ for Ti⁴⁺ has effect on the phase transformation from anatase to rutile and further lead to different papillas on the surface of hollow nanospheres. And their films consisting of corresponding hollow nanospheres can be controlled from hydrophilic to superhydrophilic: 28, 7, and 0掳. Therefore, our works open an avenue to design hierarchical surface morphology of nanospheres and further fabricate antifogging superhydrophilic films.

Keywords:

metal-ion-doped; anatase-rutile transformation; hierarchical surface; hollow TiO₂ spheres; superhydrophilic films; without UV irradiation