碳纳米管表面化学镀银及场发射性能研究

Study on field emission properties of CNTs electroless plating with Ag

利用化学镀方法对碳纳米管(carbon nano-tubes,CNTs)表面金属化镀银,研究表面化学镀银碳纳米管的场发射性能。碳纳米管经氧化处理后,表面存在一些羰基(CO)、羧基(—COOH)和羟基(—OH)等活性基团,经敏化、活化处理后,形成金属钯活化中心,进而还原金属银离子,从而获得表面化学镀银的碳纳米管。表面化学镀银碳纳米管阴极的开启电场约为0.19V/μm,当电场强度为0.37V/μm时,最大发射电流达6mA/cm2,场增强因子约为25565。实验结果表明,化学镀银层可以提高碳纳米管的电子传输和热传输能力,提高碳纳米管的场发射电流和发射稳定性,有利于碳纳米管在场发射平板显示领域的应用。

Ag were deposited on the surface of carbon nanotubes （CNTs） by eleetroless palting method, and the field emission properties of CNTs electroless plating with Ag were studied. The carbonyl, carboxyl and hydroxy groups on the surface of CNTs were produced by oxidization in mixed acid. The turn-on field of CNTs electroless plating with Ag was 0.19V/μm, and the maximal emission current achieved 6mA/cm2 at the field of 0. 37 V/μm, which the field enhancement factor was calculated as 25565. The results showed that the improvement of emission stability was attributed to the electronic and thermal conductivity of CNTs, which caused by Ag electroless plating on CNTs surface. The proposed CNT/Ag cathodes possess good field emission properties and have potential for application in field emission displays.