Synthesis and photocatalytic properties of ultra-smooth TiO2 thin films with superhydrophilicity

Main Article Content

Min Lai
Haibo Yong

Abstract

Functional TiO2 films were fabricated on glass substrates by using modified dip coating method. The properties of the films including crystal structures, thickness, surface morphology and optical properties were studied. The film coated once possessed an ultra-smooth surface with a root mean square (RMS) roughness of 2.6 ± 0.7 nm, which was attributed to the effect of N2 flow during the formation of film. The TiO2 films exhibited superhydrophilicity without UV illumination and the superhydrophilic performance was enhanced with the increase of film thickness. Tests on degradation of dyes under UV illumination indicated that the annealing temperature and thickness of the TiO2 films accounted for their photocatalytic performance. An increase of annealing temperature led to a decrease of the amount of defects and the recombination rate of electron-hole pairs. Because of change of film thickness, light absorption and amount of defects of the TiO2 films influenced photocatalytic performance simultaneously.

Downloads

Download data is not yet available.

Article Details

How to Cite
Lai, M., & Yong, H. (2018). Synthesis and photocatalytic properties of ultra-smooth TiO2 thin films with superhydrophilicity. International Journal for Innovation Education and Research, 6(3), 07-16. Retrieved from http://ijier.net/ijier/article/view/976
Section
Articles
Author Biographies

Min Lai, Nanjing University of Information Science & Technology

School of Physics and Optoelectronic Engineering

Haibo Yong, Nanjing University of Information Science & Technology

School of Physics and Optoelectronic Engineering

References

1.D.S. Xu, J.M. Li, Y.X. Yu, J.J. Li, From titanates to TiO2 nanostructures: Controllable synthesis, growth mechanism, and application, Sci. China Chem. 55(2012) 2334-2345.
2.M. Lai, S. Mubeen, N. Chartuprayoon, A. Mulchandani, M.A. Deshusses, N.V. Myung, Synthesis of Sn doped CuO nanotubes from core–shell Cu/SnO2 nanowires by the Kirkendall effect, Nanotechnology 21(2010)295601.
3.A. Fujishima, K. Honda, Electrochemical Photolysis of Water at a Semiconductor Electrode, Nature 238(1972) 37-38.
4.Y.T. Xiao, S.S. Xu, Z.H. Li, X.H. An, L. Zhou, Y.L. Zhang, Progress of applied research on TiO2 photocatalysis-membrane separation coupling technology in water and wastewater treatments, Chin. Sci. Bull. 14(2010)1345-1353.
5.F. Bensouici, T. Souier, A.A. Iratni, R. Dakhel, M. Tala-Ighil, Effect of acid nature in the starting solution on surface and photocatalytic properties of TiO2 thin films, Surf. Coat. Technol. 251(2014)170-176.
6.M. Andersson, L. österlund, S. Ljungström, A. Palmqvist, Preparation of nanosize anatase and rutile Tio2 by hydrothermal treatment of microemulsions and their activity for photocatalytic wet oxidation of phenol, J. Phys. Chem. B. 106(2002)10674-10679.
7.A. Rothschild, A. Levakov, Y. Shapira, N. Ashkenasy, Y. Komem, Surface photovoltage spectroscopy study of reduced and oxidized nanocrystalline TiO2 films, Surf. Sci. 532-535(2003)456-460.
8.B. O'Regan, M. Grätzel, A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films, Nature 353(1991),737-740.
9.G. Benkö, P. Myllyperkiö, J. pan, A.P. Yartsev, V. Sundström, Photoinduced electron injection from Ru(dcbpy)2(NCS)2 to SnO2 and TiO2 nanocrystalline films, J. Am. Chem. Soc. 125(2003)1118-1119.
10.A. Borras, A. Barranco, A.R. Gonzalez-Elipe, Reversible Superhydrophobic to superhydrophilic conversion of Ag@TiO2 composite nanofiber surfaces, Langmuir 24(2008)8021-8026.
11.T. Watanabe, A. Nakajima, R. Wang, M. Minabe, S. Koizumi, A. Fujishima, K. Hashimoto, Photocatalytic activity and photoinduced hydrophilicity of titanium dioxide coated glass, Thin Solid Films351(1999)260-263.
12.U.O.A. Arier, F.Z. Tepehan, Influence of heat treatment on the particle size of nanobrookite TiO2 thin films produced by sol–gel method, Surf. Coat. Technol. 206(2011)37-42.
13.L.L. Cao, T.P. Price, M. Weiss, D. Gao, Super Water- and Oil-Repellent Surfaces on Intrinsically Hydrophilic and Oleophilic Porous Silicon Films, Langmuir 24(2008)1640-1643.
14.I. Ruzybayev, S.I. Shah, The role of oxygen pressure in nitrogen and carbon co-doped TiO2 thin films prepared by pulsed laser deposition method, Surf. Coat. Technol. 241(2014)148-153.
15.L. Sirghi, Y. Hatanaka, Hydrophilicity of amorphous TiO2 ultra-thin films, Surf. Sci. 530(2003)L323-L327.
16.L. Sirghi, T. Aoki, Y. Hatanaka, Hydrophilicity of TiO2 thin films obtained by radio frequency magnetron sputtering deposition, Thin Solid Films422(2002)55-61.
17.X. Feng, K. Shankar, O.K. Varghese, M. Paulose, T.J. Latempa, C.A. Grimes, Vertically aligned single crystal Tio2 nanowire arrays grown directly on transparent conducting oxide coated glass: synthesis details and applications, Nano Lett. 8(2008)3781-3786.
18.Y.B. Xiong, M. Lai, J. Li, H.B. Yong, H.Z Qian, C.Q Xun, K. Zhong, S.R. Xiao, Facile synthesis of ultra-smooth and transparent TiO2 thin films with superhydrophilicity, Surf. Coat. Technol. 265(2015) 78-82.
19.J.Q. Zhong, Z.Z. Wang, J.L. Zhang, C.A. Wright, K.D. Yuan, C.d. Gu, A. Tadich, D.C. Qi, H.X. Li, M. Lai, K. Wu, G.Q. Xu, W.P. Hu, Z.Y. Li, W. Chen, Reversible tuning of interfacial and intramolecular charge transfer in individual MnPc molecules, Nano Lett. 15(2015)8091-8098.
20. G. McHale, N.J. Shirtcliffe, S. Aqil, C.C. Perry, M.I. Newton, Topography driven spreading, Phys. Rev. Lett. 93(2004) 036102.
21. W. Chen, K.P. Chen, M.D. Thoreson, A.V. Kildishev, V.M. Shalaev, Ultrathin, ultrasmooth, and low-loss silver films via wetting and annealing, Appl. Phys. Lett. 97(2010) 211107.