喷墨打印“咖啡环效应”制备柔性高性能碳纳米管透明导电薄膜

Inkjet printing of flexible high-performance carbon nanotube transparent conductive films by "coffee ring effect".

机构信息

Casali Center for Applied Chemistry, The Center for Nanoscience and Nanotechnology, Institute of Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel.

出版信息

Nanoscale. 2014 Oct 7;6(19):11084-9. doi: 10.1039/c4nr02133a.

DOI:10.1039/c4nr02133a

PMID:25014193

Abstract

Transparent and flexible conductors are a major component in many modern optoelectronic devices, such as touch screens for smart phones, displays, and solar cells. Carbon nanotubes (CNTs) offer a good alternative to commonly used conductive materials, such as metal oxides (e.g. ITO) for flexible electronics. The production of transparent conductive patterns, and arrays composed of connected CNT "coffee rings" on a flexible substrate poly(ethylene terephthalate), has been reported. Direct patterning is achieved by inkjet printing of an aqueous dispersion of CNTs, which self-assemble at the rim of evaporating droplets. After post-printing treatment with hot nitric acid, the obtained TCFs are characterized by a sheet resistance of 156 Ω sq(-1) and transparency of 81% (at 600 nm), which are the best reported values obtained by inkjet printing of conductive CNTs. This makes such films very promising as transparent conductors for various electronic devices, as demonstrated by using an electroluminescent device.

摘要

透明且柔韧的导体是许多现代光电设备的重要组成部分，例如智能手机的触摸屏、显示器和太阳能电池。碳纳米管（CNT）为可弯曲电子产品提供了一种优于常见导电材料（例如金属氧化物，如 ITO）的替代品。已经有报道称，在聚对苯二甲酸乙二醇酯（PET）等柔性基底上，可以生产出由相互连接的 CNT“咖啡环”组成的透明导电图案和阵列。通过喷墨打印 CNT 的水性分散体来实现直接图案化，该分散体在蒸发液滴的边缘自组装。喷墨打印后的 CNT 经热硝酸后处理，所得到的 TCF 的方阻为 156 Ω/sq，透光率为 81%（在 600nm 处），这是通过喷墨打印导电 CNT 获得的最佳报告值。这使得此类薄膜非常有希望成为各种电子设备的透明导体，例如通过使用电致发光器件进行演示。