Photocatalytic Lithography Based on Photocatalytic Remote Oxidation

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Photocatalytic lithography is a method for surface patterning based on photocatalytic remote oxidation. A TiO2-coated photomask is faced with a surface to be patterned, and irradiated with UV light. If a glass plate modified with alkyl chains is used, hydrophilic/hydrophobic patterns can be obtained. The alkyl chains in the irradiated regions are removed by oxidative decomposition, and those in the non-irradiated regions are left. Irradiation time is 30-60 s, and resolution is about 5 μm. This technique is potentially applicable to fabrication of biochips, lab-on-a-chip devices and simple electronic circuits.

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