Transparent conductor, method for preparing the same, and optical display including the same
A transparent conductor, a method for preparing the same, and an optical display including the same, the transparent conductor including a base layer; and a conductive layer on the base layer, the conductive layer including metal nanowires and a matrix, wherein the transparent conductor has a transmissive b* value of about 1.5 or less, and the matrix is prepared from a matrix composition including a tri-functional monomer and one of a penta-functional monomer or a hexa-functional monomer a base layer; and a conductive layer formed on the base layer and including metal nanowires and a matrix, wherein the transparent conductor has a transmissive b* value of about 1.5 or less, and the matrix is formed of a composition including a penta- or hexa-functional monomer and a tri-functional monomer.
1. A transparent conductor, comprising:
a base layer; and
a conductive layer on the base layer, the conductive layer including metal nanowires and a matrix,
wherein:
the transparent conductor has a transmissive b* value of about 1.5 or less, and
the matrix is prepared from a matrix composition including a tri-functional monomer and one of a penta-functional monomer or a hexa-functional monomer, a weight ratio of the penta-functional monomer or a hexa-functional monomer to the tri-functional monomer in the matrix composition being about 2:1 to about 5:1.
2. The transparent conductor as claimed in claim 1 , wherein the tri-functional monomer includes a (meth)acrylate-based monomer.
3. The transparent conductor as claimed in claim 1 , wherein the tri-functional monomer includes a (meth)acrylate-based monomer modified with an alkoxy group.
4. The transparent conductor as claimed in claim 1 , wherein the transparent conductor has a resistance variation rate of about 10% or less, as represented by the following equation:
Resistance variation rate=| b−a|/a× 100,
wherein, “a” represents an initial sheet resistance of a sample formed by stacking a 125 μm thick transparent adhesive film and a 100 μm thick PET film sequentially on the transparent conductor, and “b” represents a sheet resistance of the sample after being left under conditions of 85° C. and 85% RH for 240 hours.
5. The transparent conductor as claimed in claim 1 , wherein the matrix composition further includes at least one of an initiator, an adhesion promoter, or an antioxidant.
6. The transparent conductor as claimed in claim 5 , wherein:
the matrix composition includes the adhesion promoter, and
the adhesion promoter is present in the matrix composition in an amount of about 1 wt % to about 15 wt %, in terms of solid content.
7. The transparent conductor as claimed in claim 5 , wherein:
the matrix composition includes the antioxidant, and
the antioxidant is present in the matrix composition in an amount of about 0.01 wt % to about 5 wt %, in terms of solid content.
8. The transparent conductor as claimed in claim 5 , wherein the matrix composition includes:
about 50 wt % to about 70 wt % of the hexa-functional monomer or the penta-functional monomer,
about 10 wt % to about 30 wt % of the tri-functional monomer,
about 1 wt % to about 15 wt % of the initiator,
about 1 wt % to about 15 wt % of the adhesion promoter, and
about 0.01 wt % to about 5 wt % of the antioxidant, all amounts being in terms of solid content.
9. The transparent conductor as claimed in claim 5 , wherein:
the matrix composition includes the adhesion promoter, and
the adhesion promoter includes at least one of a silane coupling agent or a bi-functional monomer.
10. The transparent conductor as claimed in claim 5 , wherein:
the matrix composition includes the antioxidant, and
the antioxidant includes a hindered amine light stabilizer (HALS)-based antioxidant and a phosphorus-based antioxidant.
11. The transparent conductor as claimed in claim 5 , wherein:
the matrix composition includes the antioxidant, and
the antioxidant includes a triazole-based antioxidant, a phenol-based antioxidant, and a phosphorus-based antioxidant.
12. The transparent conductor as claimed in claim 5 , wherein:
the matrix composition includes the antioxidant, and
the antioxidant includes a triazine-based antioxidant, a phenol-based antioxidant, and a phosphorus-based antioxidant.
13. The transparent conductor as claimed in claim 1 , wherein the metal nanowires include silver nanowires.
14. The transparent conductor as claimed in claim 1 , further comprising, on an upper or lower surface of the base layer, at least one of a hard coating layer, an anticorrosive layer, an anti-glare coating layer, an adhesion enhancing layer, or an oligomer elution preventive layer.
15. The transparent conductor as claimed in claim 1 , wherein the conductive layer is a patterned conductive layer.
16. An optical display comprising the transparent conductor as claimed in claim 1 .
17. The transparent conductor as claimed in claim 1 , wherein the transparent conductor has a transmissive b* value of about 0.5 to about 1.5.
18. A method for preparing the transparent conductor as claimed in claim 1 , the method comprising:
forming a metal nanowire network layer on the base layer; and
forming the conductive layer on the metal nanowire network layer using the matrix composition, the matrix composition including the tri-functional monomer, an adhesion promoter, an antioxidant, an initiator, and the one of a penta-functional monomer or a hexa-functional monomer.
19. A transparent conductor, comprising:
a base layer; and
a conductive layer on the base layer, the conductive layer including metal nanowires and a matrix,
wherein:
the transparent conductor has a transmissive b* value of about 1.5 or less,
the matrix is prepared from a matrix composition including a tri-functional monomer and one of a penta-functional monomer or a hexa-functional monomer, and
the matrix composition includes:
about 50 wt % to about 70 wt % of the hexa-functional monomer or the penta-functional monomer,
about 10 wt % to about 30 wt % of the tri-functional monomer,
about 1 wt % to about 15 wt % of an initiator,
about 1 wt % to about 15 wt % of an adhesion promoter, and
about 0.01 wt % to about 5 wt % of an antioxidant, all amounts being in terms of solid content.