Transparent conductors and methods for fabricating transparent conductors
View Patent ↗Transparent conductors and methods for fabricating transparent conductors are provided. In one exemplary embodiment, a transparent conductor comprises a substrate having a surface and a transparent conductive coating disposed on the surface of the substrate. The transparent conductive coating has a plurality of conductive components of at least one type and an aliphatic isocyanate-based polyurethane component.
1. A transparent conductor comprising:
a substrate having a surface;
a transparent conductive coating disposed on the surface of the substrate, the transparent conductive coating having a plurality of conductive components of at least one type at least partially embedded in a binder having an aliphatic isocyanate-based polyurethane component, wherein the conductive components comprise components selected from the group consisting of nanotubes, nanowires, and a combination thereof.
2. The transparent conductor of claim 1 , wherein the aliphatic isocyanate-based polyurethane component is an aliphatic isocyanate-based polyurethane having no more than 50% crosslinking.
3. The transparent conductor of claim 1 , wherein the aliphatic isocyanate-based polyurethane component is an aliphatic isocyanate-based polyurethane formed from an oligomer with a molecular weight of at least 2500.
4. The transparent conductor of claim 1 , wherein the aliphatic isocyanate-based polyurethane component is physically or chemically bonded to the surface of the substrate.
5. The transparent conductor of claim 4 , wherein the aliphatic isocyanate-based polyurethane component is a polar aliphatic isocyanate-based polyurethane and the substrate has a substantially polar molecular surface.
6. The transparent conductor of claim 4 , wherein at least a substantial portion of molecules at the surface of the substrate comprises alcohol (—OH)-terminated molecules and the aliphatic isocyanate-based polyurethane component comprises an isocyanate (—NCO)-terminated polyurethane.
7. The transparent conductor of claim 4 , wherein at least a substantial portion of molecules at the surface of the substrate comprises acid (—COOH)-terminated molecules and the aliphatic isocyanate-based polyurethane component comprises an isocyanate (—NCO)-terminated polyurethane.
8. The transparent conductor of claim 4 , wherein at least a substantial portion of molecules at the surface of the substrate comprises acid (—COOH)-terminated molecules and the aliphatic isocyanate-based polyurethane component comprises an alcohol (—OH)-terminated polyurethane.
9. The transparent conductor of claim 4 , wherein at least a substantial portion of molecules at the surface of the substrate comprises acid (—COOH)-terminated molecules and the aliphatic isocyanate-based polyurethane component comprises an amine (—NH 2 )-terminated polyurethane.
10. The transparent conductor of claim 1 , wherein the aliphatic isocyanate-based polyurethane component is a segmented polyurethane comprising hard and soft segments.
11. The transparent conductor of claim 1 , wherein the transparent conductor has a total light transmittance of no less than about 50% and a surface resistivity it the range of about 10 1 to about 10 12 Ω/sq.