Thin Films and Nanoscience Laboratory, Department of Physics, Jadavpur University, Kolkata 700032, India.
Nanotechnology. 2010 Dec 17;21(50):505701. doi: 10.1088/0957-4484/21/50/505701. Epub 2010 Nov 22.
A flexible cold cathode based on a uniform array of ZnO nanowires over carbon fabrics was designed via a simple wet chemical route. The structural parameters of the nanowires (i.e. length, diameter) as well as their arrangement over the carbon fibers were tailored by adjusting nutrient solution composition and growth duration. The optimized arrays of ZnO nanowires exhibit excellent electron emission performance with ultralow turn-on as well as threshold fields of 0.27 and 0.56 V µm(-1). This threshold field value is the lowest compared to any of the previous zinc-oxide-based cold cathodes realized through either chemical or vapor phase processes. In addition, the current density can reach an exceptionally high value of ∼ 11 mA cm(-2) at an applied electric field of only 0.8 V µm(-1). Flexible electronic devices based on a field emitter cold cathode may thus be realized through chemical processing at low budget but having high efficiency.
通过简单的湿化学方法设计了一种基于均匀 ZnO 纳米线阵列的柔性冷阴极，该冷阴极覆盖在碳纤维上。通过调整营养溶液组成和生长时间，可以控制纳米线（例如，长度、直径）的结构参数及其在碳纤维上的排列方式。优化后的 ZnO 纳米线阵列具有出色的电子发射性能，开启电压和阈值电压分别低至 0.27 和 0.56 V µm(-1)。与通过化学或气相工艺实现的任何以前的基于氧化锌的冷阴极相比，这个阈值电场值是最低的。此外，在仅为 0.8 V µm(-1)的外加电场下，电流密度可达到高达约 11 mA cm(-2)的异常高值。因此，通过低成本的化学处理但具有高效率，可以实现基于场发射冷阴极的柔性电子器件。
