申请人:Luo Jiazhong
公开号:US20060113510A1
公开(公告)日:2006-06-01
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.
本发明涉及使用碳纳米管(CNT),特别是单壁碳纳米管与聚合物粘合剂形成的柔性透明导电涂层和薄膜。涂层和薄膜最好由应用于透明基底的碳纳米管形成,形成一个或多个纳米级厚度的导电层。聚合物粘合剂应用于具有开放结构的 CNT 网络涂层,通过渗透提供保护。这样可以增强防潮、耐热、耐磨和界面粘附等性能。聚合物可以是热塑性塑料或热固性塑料,也可以是它们的组合。聚合物也可以是绝缘的或固有导电的,或两者的任意组合。聚合物可由单层或多层组成,作为 CNT 涂层下面的底层,或 CNT 涂层上面的面层,或形成夹层结构的底层和面层的组合。将含氟聚合物粘合剂(一种含氟聚合物或含氟聚合物混合物的溶液,可使用添加剂配制)涂在透明基底(如 PET 和玻璃)上的纳米级厚度的碳纳米管透明导电涂层上。含氟聚合物或混合物可以是半结晶(结晶度低)或无定形,最好是折射率低的无定形。粘合剂涂层的厚度可通过改变粘合剂浓度、涂布速度和/或其他工艺条件来调整。这种粘合剂涂层能大大提高光学透明度,还能保持或提高 CNT 涂层的导电性。这种粘合剂涂层及其制成的产品还具有耐磨、耐热和防潮等优点,可用于显示器和电子应用领域。