Patent ID: 8048483

Claim:
A method of chemically depositing a thin film on a flexible polymer substrate, the method comprising: evaporating a precursor by an evaporator to provide a source vapor; transferring the source vapor to a shower head disposed in a reaction chamber; heating the shower head by a heating source provided with the shower head disposed in the reaction chamber to a temperature identical to or higher than the decomposition temperature of the precursor; holding the transferred source vapor in the shower head for a predetermined time sufficient to thermally decompose the source vapor into nano-size single phase nanoparticles; and depositing the nano-size single phase nanoparticles on the flexible polymer substrate, wherein the precursor of the source vapor is a mixture of bismuth and niobium, the shower head is heated to a temperature of 220° C. to 270° C., and the flexible polymer substrate is at 40° C. to 60° C.