Physico-chemical Processes and Kinetics of Sunlight-Induced Hydrophobic ⇆ Superhydrophilic Switching of Transparent N-Doped TiO2 Thin Films

被引:28
|
作者
Sahoo, Madhusmita [1 ]
Mathews, Tom [1 ]
Antony, Rajini P. [1 ]
Krishna, D. Nandagopala [2 ]
Dash, S. [1 ]
Tyagi, A. K. [1 ]
机构
[1] Indira Gandhi Ctr Atom Res, Surface & Nanosci Div, Kalpakkam 603102, Tamil Nadu, India
[2] Indira Gandhi Ctr Atom Res, Corros Sci & Technol Div, Kalpakkam 603102, Tamil Nadu, India
关键词
N-doped TiO2; thin films; photoinduced superhydrophilicity; hydrophobic-hydrophilic switching; switching mechanism; X-ray photoelectron spectroscopy; LIGHT-INDUCED HYDROPHILICITY; PHOTOCATALYTIC ACTIVITY; NITROGEN; ELECTRON; SURFACE; CONVERSION; ROUGHNESS; XPS;
D O I
10.1021/am400785x
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Sunlight-responsive anatase N-doped TiO2 thin films undergoing reversible and switchable hydrophobic to superhydrophilic transition were synthesized by ultrasonic spray pyrolysis in a single step. Film thickness, roughness, surface morphology, crystal structure, composition, band gap, and wetting properties were studied using surface profilometry, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis spectroscopy, and water contact angle measurements, respectively. Surface X-ray photoelectron spectroscopy before and after sunlight irradiation revealed the major physicochemical process responsible for the hydrophobic -> hydrophilic transition as surface hydroxylation and that responsible for hydrophilic -> superhydrophilic transition as destruction of surface adsorbed organic species. The kinetic rates of the hydrophobic -> superhydrophilic transition under sunlight and superhydrophilic -> hydrophobic transition when kept under dark are found to be 0.215 min(-1) and 2.03 x 10(-4) min(-1), respectively.
引用
收藏
页码:3967 / 3974
页数:8
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