Properties of vertically oriented mesoporous film prepared by electrochemical deposition

Journal of Porous Materials, August 2014, Volume 21, Issue 4, pp 395-399.

Yuan Zhou, Yunzhou Ma, Min Tan, Qiming Liu.

 

Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072, China and

GuoDian Science and Technology Research Institute, Nanjing, 210031, China and

State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China.

 

Abstract

A mesoporous silica film with highly ordered vertically oriented channels was successfully prepared using electrochemical deposition. During preparation, negative potential was applied to the working electrode that was immersed into the original sol to induce OH ions. These ions were then used as catalyst to promote the condensation polymerization and self-assembly of TEOS to form a mesoporous film with vertical orientation. We studied the effect of the supporting electrolyte on the TEOS hydrolysis and the electrodeposition process. Results showed that neutral nitrate is a high efficient supporting electrolyte. The scanning electron microscopy and transmission electron microscopy characterization of the film surface showed that the channels of the mesoporous film were cylindrical in shape and arranged in an orderly manner. However, regional “polycrystalline” structures with defects were also observed. Ultraviolet–visible spectroscopy analysis was also performed to characterize the transmittance of the prepared mesoporous films. Results showed that the prepared film is a promising optical amorphous antireflection film with larger porosity.

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