Substrate with sliding dielectric film and method of manufacturing the same
A substrate formed by using a sliding dielectric film with a low surface energy that activates surface migration of metal adatoms and a method of manufacturing the same. More particularly, a substrate with a sliding dielectric film includes a substrate; a sliding dielectric film with a low surface energy formed on the substrate; and a nanoparticle formed on the sliding dielectric film, wherein the surface energy of the nanoparticle is at least 1000 mJ/m 2 greater than the surface energy of the sliding dielectric film. The substrate has a very high SERS enhancement factor with low light loss characteristics in the entire visible region by maximizing the plasmonic coupling between highly-dense and spaced-apart nanoparticles and between the lower substrate and the upper nanoparticles.
1. A substrate with a sliding dielectric film comprising:
a substrate, the substrate being a polymer or a resin;
a first metal-containing thin film formed on a surface of the substrate;
a sliding dielectric film with a lower surface energy compared to the surface energy of a nanoparticle formed on the substrate; and
the nanoparticle formed on the sliding dielectric film and having an average particle size of 40 nm or greater,
wherein the surface energy of the nanoparticle is at least 1000 mJ/m 2 greater than the surface energy of the sliding dielectric film, and
wherein the first metal-containing thin film includes concave grooves in grain boundary regions.
2. The substrate of claim 1 , wherein the surface energy of the sliding dielectric film is 100 mJ/m 2 or less.
3. The substrate of claim 1 , wherein the sliding dielectric film is formed of at least one selected from alkanethiol, alkyldisulfide, fluorocarbon thiol, fluorocarbon silane, chlorocarbon silane, fluorocarbon carboxylic acid, fluorocarbon amine, fluorocarbon polymer and a derivative thereof.
4. The substrate of claim 1 , wherein a thickness of the sliding dielectric film is 0.5 nm to 100 nm.
5. The substrate of claim 1 , wherein the sliding dielectric film is formed by vapor deposition or solution process.
6. The substrate of claim 1 , further comprising a plurality of nanostructures formed on the surface of the substrate, each nanostructure of the plurality of nanostructures being spaced-apart from each other.
7. The substrate of claim 6 , wherein the plurality of nanostructures are formed by plasma etching, soft lithography, nanoimprint lithography, photo lithography, or holographic lithography.
8. The substrate of claim 6 , further comprising the first metal-containing thin film formed on a surface of the nanostructure.
9. The substrate of claim 1 , wherein the first metal-containing thin film is formed by vacuum depositing a Raman active material.
10. The substrate of claim 9 , wherein the Raman active material is Au, Ag, or an alloy thereof.
11. The substrate of claim 9 , wherein the first metal-containing thin film is formed by vacuum depositing the Raman active material to a thickness of 10 nm or more.
12. The substrate of claim 1 , further comprising a second metal-containing thin film formed between the substrate and the first metal-containing thin film,
wherein the second metal-containing thin film has a lower surface energy than the first metal-containing thin film.
13. The substrate of claim 12 , wherein the second metal-containing thin film is formed of one selected from Ag, Cu, Pt, Pd, Ti, and an alloy thereof.
14. The substrate of claim 1 , wherein the nanoparticle is a metal-containing nanoparticle.
15. The substrate of claim 1 , wherein the nanoparticle is formed by vacuum depositing a Raman active material.
16. The substrate of claim 15 , wherein the Raman active material is Au, Ag or an alloy thereof.
17. A method for manufacturing a substrate with a sliding dielectric film of claim 1 , the method comprising:
forming the substrate, the substrate being a polymer or a resin;
forming a first metal-containing thin film formed on a surface of the substrate;
forming a sliding dielectric film with a low surface energy on the substrate; and
forming a nanoparticle on the sliding dielectric film, the nanoparticle having an average particle size of 40 nm or greater,
wherein the surface energy of the nanoparticle is at least 1000 mJ/m 2 greater than the surface energy of the sliding dielectric film.
18. The substrate of claim 1 , wherein the nanoparticle is formed on one of the concave grooves of the substrate by surface migration on the sliding dielectric film.