Polydopamine composite material and manufacturing method thereof
Provided is a polydopamine composite material according to the concept of the present invention, wherein the polydopamine composite material includes a substrate with first nano-protrusions formed on a surface thereof, and a polydopamine layer on the surface of the substrate. The polydopamine layer includes second nano-protrusions protruding in a direction perpendicular to the surface of the substrate.
1 . A polydopamine composite material comprising:
a substrate having first nano-protrusions formed on a surface thereof; and
a polydopamine layer on the surface of the substrate,
wherein the polydopamine layer fills gaps between adjacent ones of the first nano-protrusions and includes second nano-protrusions on a surface thereof,
wherein the second nano-protrusions protrude in a direction perpendicular to the surface of the substrate, each of the second nano-protrusions being formed on a corresponding one of the first nano-protrusions and overlapping the corresponding one of the first nano-protrusions in the direction perpendicular to the surface of the substrate,
wherein each of the second nano-protrusions has a height less than a height of the corresponding one of the first nano-protrusions, and
wherein the polydopamine layer has a contact angle with water of less than 10 degrees.
2 . The polydopamine composite material of claim 1 , wherein the substrate comprises at least one of plastic, silicon (Si), a metal, ceramic, a synthetic fiber, or a natural fiber.
3 . The polydopamine composite material of claim 2 , wherein the surface of the substrate has any one shape among a planar shape, a curved shape, or a three-dimensional structure shape.
4 . The polydopamine composite material of claim 1 , wherein the first nano-protrusions have the shape of a nano-pillar, a nano-hair, a nano-fiber, or a combination thereof.
5 . The polydopamine composite material of claim 1 , wherein:
the height of each of the first nano-protrusions is approximately 50 nm to approximately 2.2 μm; and
a pitch between the first nano-protrusions is approximately 10 nm to approximately 1.2 μm.
6 . The polydopamine composite material of claim 1 , wherein:
the height of each of the second nano-protrusions is approximately 30 nm to approximately 1.5 μm; and
a pitch between the second nano-protrusions is approximately 10 nm to approximately 1.2 μm.
7 . The polydopamine composite material of claim 1 , further comprising functional particles disposed in the polydopamine layer, wherein the functional particles include at least one of carbon black, carbon nanotubes, graphene, graphene oxide, metal-organic frameworks, metal particles, or oxide particles.
8 . The polydopamine composite material of claim 1 , wherein a thickness of the polydopamine layer is greater than approximately 1 nm to less than approximately 10 μm.
9 . The polydopamine composite material of claim 8 , wherein a thickness of the polydopamine layer is greater than approximately 130 nm.
10 . The polydopamine composite material of claim 1 , wherein the polydopamine layer is conformally formed on the first nano-protrusions.
11 . The polydopamine composite material of claim 10 , wherein the surface of the substrate has a planar shape.
12 . The polydopamine composite material of claim 10 , wherein the polydopamine layer further includes functional particles disposed therein.
13 . The polydopamine composite material of claim 12 , wherein the functional particles include at least one of carbon black, carbon nanotubes, graphene, graphene oxide, metal-organic frameworks, metal particles, or oxide particles.
14 . A method for manufacturing a polydopamine composite material, the method comprising:
preparing a substrate;
forming first nano-protrusions on a surface of the substrate;
coating a dopamine solution on the surface of the substrate on which the first nano-protrusions are formed for 1 second to 1 minute; and
polymerizing the dopamine solution in air,
wherein the polymerizing of the dopamine solution in air forms a polydopamine layer conformally on the first nano-protrusions,
wherein the polydopamine layer fills gaps between adjacent ones of the first nano-protrusions and includes second nano-protrusions on a surface thereof,
wherein the second nano-protrusions protrude in a direction perpendicular to the surface of the substrate, each of the second nano-protrusions being formed on a corresponding one of the first nano-protrusions and overlapping the corresponding one of the first nano-protrusions in the direction perpendicular to the surface of the substrate,
wherein each of the second nano-protrusions has a height less than a height of the corresponding one of the first nano-protrusions, and
wherein the polydopamine layer has a contact angle with water of less than 10 degrees.
15 . The method of claim 14 , wherein the forming of the nano-protrusions comprises performing plasma treatment, wherein the performing of the plasma treatment includes providing at least one of O 2 , CF 4 , SF 6 , Ar, N 2 , H 2 , or a mixture gas thereof on the surface of the substrate.
16 . The method of claim 15 , wherein the performing of the plasma treatment comprises performing a reaction between plasma and the surface of the substrate within approximately 1 to approximately 90 minutes.
17 . The method of claim 14 , wherein the coating of the dopamine solution is performed within approximately 1 second to approximately 1 minute.
18 . The method of claim 14 , wherein the forming of the first nano-protrusions comprises a laser beam process, ion beam process, lithography process, or acid etching process.
19 . The method of claim 17 , further comprising adding functional particles to the dopamine solution, before coating the dopamine solution on the surface of the substrate.
20 . The method of claim 19 , wherein the functional particles include at least one of carbon black, carbon nanotubes, graphene, graphene oxide, metal-organic frameworks, metal particles, or oxide particles.