Selective surface patterning via nanoimprinting
Substrates comprising dual functional polymer layered surfaces and the preparation thereof by using UV nano-imprinting processes are disclosed. The substrates can be used as flow cells, nanofluidic or microfluidic devices for biological molecules analysis.
1. A method of preparing a substrate, comprising:
providing a substrate comprising a first patterned polymer layer on a surface of the substrate;
depositing a first photonic crystal material on top of and in direct contact with the entire first patterned polymer layer such that the first photonic crystal material adopts the patterns in the first patterned polymer layer; and
forming a second patterned polymer layer on top of and in direct contact with the entire first photonic crystal material, wherein forming the second patterned polymer layer involves:
depositing a photocurable polymer composition on the first photonic crystal material;
imprinting a stamp on the photocurable polymer composition;
subjecting the photocurable polymer composition to ultraviolet curing; and
grafting primers to the second patterned polymer layer;
wherein the first patterned polymer layer and the second patterned polymer layer include poly(N-(5-azidoacetamidylpentyl)acrylamide-coacrylamide).
2. The method of claim 1 , wherein the providing comprises preparing the first patterned polymer layer by mechanical embossing, nanoimprint lithography, or resist-free nanoimprint lithography.
3. The method of claim 2 , wherein the first patterned polymer layer is prepared by resist-free nanoimprint lithography.
4. The method of claim 1 , wherein the patterns in the first patterned polymer layer are substantially the same as the patterns in the second patterned polymer layer.
5. The method of claim 1 , wherein the patterns in the first patterned polymer layer are complementary to the patterns in the second patterned polymer layer.
6. The method of claim 1 , wherein the first photonic crystal material has high refractive index and low adsorption.
7. The method of claim 6 , wherein the first photonic crystal material comprise Ta 2 O 5 .
8. The method of claim 1 , wherein the patterns in the first patterned polymer layer and the second patterned polymer layers comprise micro-scale or nano-scale channels, micro-scale or nano-scale trenches, micro-scale or nano-scale posts, micro-scale or nano-scale wells, or combinations thereof.