Patent ID: 7459182

Claim:
A process for the preparation of a material comprising an organic substrate and at least one dielectric layer consisting of one or more oxides of a metal selected from groups 3 to 15 of the periodic table, which comprises the steps of: (a) suspending the organic substrate in an aqueous solution of a fluorine scavenger; (b) adding an aqueous solution of one or more fluorine containing metal complexes which are the precursors of the desired metal oxide coating; and (c) subjecting said suspension to microwave radiation to deposit the metal oxide onto said organic substrate, wherein steps (b) and (c) can optionally be repeated using different fluorine containing metal complexes to produce one or more metal oxide layers or a gradient of concentration of 2 different metal oxides across the thickness and which steps further comprise dissolving of the organic substrate, to yield one or more of the deposited free metal oxides or mixed metal oxides.