This invention relates to flexible, transparent and conductive coatings and films formed using carbon nanotubes (CNT) and, in particular, single wall carbon nanotubes, with
polymer binders. Preferably, coatings and films are formed from carbon nanotubes applied to transparent substrates forming one or multiple conductive
layers at nanometer level of thickness.
Polymer binders are applied to the CNT network
coating having an
open structure to provide protection through infiltration. This provides for enhancement of properties such as
moisture resistance,
thermal resistance, abrasion resistance and
interfacial adhesion. Polymers may be thermoplastics or thermosets, or a combination thereof. Polymers may also be insulative or inherently electrical conductive, or any combination of both. Polymers may comprise single or multiple
layers as a basecoat underneath a CNT
coating, or a topcoat above a CNT
coating, or combination of the basecoat and the topcoat forming a sandwich structure. A
fluoropolymer containing binder, which is a solution of one
fluoropolymer or a blend of fluoropolymers, which may be formulated with additives, is applied onto a
carbon nanotube-based transparent
conductive coating at nanometer level of thickness on a clear substrate such as PET and glass. The fluoropolymers or blend can be either semi-crystalline (with low level of
crystallinity) or amorphous, preferably to be amorphous with low
refraction index. Binder coating thickness can be adjusted by changing binder concentration, coating speed and / or other
process conditions. This binder coating significantly improves
optical transparency, and also maintain or increases
conductivity of the CNT-based coating. With other benefits such as abrasion, thermal and
moisture resistance, this binder coating and the resulting products is used for display and electronic applications.