MOLECULAR-SIEVING PROPERTY OF SILICA OVERLAYER ON TIN OXIDE GENERATEDBY ORGANIC TEMPLATE

In order to create a molecular recognition property, tin oxide surface was modified by a chemical vapor deposition (CVD) method of silicon a lkoxide using pre-adsorbed benzaldehyde as a template. The adsorption of aldehydes with different molecular sizes on silica-deposited tin ox ide was studied at various temperatures. The molecular sieving propert y thus created was controlled by a steric hindrance between the silica overlayer and the adsorbates. The silica overlayer prepared by the CV D using alpha-naphthaldehyde showed a different adsorption property fr om the sample prepared using benzaldehyde. Thus, the molecular sieving property of silica overlayer could be adjusted by the selection of th e template molecule. (C) 1997 Elsevier Science B.V.