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Functionalisation of the template-free and template-structured silica films synthesised on glass substrates by sol–gel technique
Authors:Tetyana Levchenko  Yuri Plyuto  Nina Kovtyukhova
Institution:(1) Institute of Surface Chemistry of NASU, 17 General Naumov Str., 03164 Kiev, Ukraine;(2) The Pennsylvania State University, University Park, PA 16802, USA
Abstract:Possibility of the post-synthesis functionalisation of the template-free and template-structured silica films of ca. 200 nm thickness on glass slides was evaluated. The films were prepared by dip-coating from TEOS sol–gel precursor in the absence or presence of CTAB template. It has been found out that the template-structured silica films can be functionalised with Ag nanoparticles via Ag(NH3)2]NO3 ion-exchange or with adsorbed Methylene Blue (MB) cationic dye due to the presence of the well-organised mesopores after template removal. In contrast, only the external geometric surface of the template-free silica films appeared to be accessible for modifier molecules. Possibility of functionalisation of the multi-layered template-structured silica film depends on the sequence of dip-coating and calcination steps upon their preparation. When preparation includes reiteration of dip-coating and calcination steps, only the latest top silica film appears to be accessible to modifier molecules. When preparation includes successive dip-coating cycles accomplished by calcination of the final multi-layered film, all pores appear to be accessible since their formation occurs via simultaneous removal of the template molecules over the whole thickness of the multi-layered template-structured silica film.
Keywords:Sol–  gel synthesis  Silica film  Surface functionalisation  Nanoparticle
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