图案化处理以及金纳米颗粒修饰增强的碳纳米管光电阴极

【作者】 徐林； 王琦龙； 齐志央； 马祥宇； 张建； 徐季； 张晓兵；

【机构】 东南大学电子科学与工程学院；

【摘要】 针对高稳定性、高亮度的光阴极在大科学装置和电子束加工与分析仪器中的重要应用需求,一维的纳米材料碳纳米管作为新型的光电发射材料被广泛的关注与研究。本文分析了基于碳纳米管的光电发射电子源的特征,针对当前其量子效率与实用化指标差距较大的瓶颈问题,提出图案化的碳纳米管阵列以充分增强边缘效应,并利用金纳米颗粒修饰碳纳米管表面,借助表面等离激元效应来实现增强的光吸收和局域电场增强。制备获得的20×20μm的正方形阵列碳纳米管,经利用金纳米颗粒进行管壁表面修饰后,在连续激光和飞秒脉冲激光分别照射下,该型碳纳米管光电阴极的电子发射量子效率可达到4.98×10^-5。更多还原

【Abstract】 High-stability, high-brightness photoelectric cathode have important application in large scientific device and electron beam processing and analysis instruments. One-dimensional carbon nanotubes are a new type of photoelectric emission material, so they are widely concerned and studied. In this paper, the characteristics of a photoelectric emission electron source based on carbon nanotubes are analyzed. The current bottleneck problem of carbon nanotubes is large gaps between quantum efficiency and practical indicators. This paper proposes patterned carbon nanotube arrays to fully enhance the edge effect. And then the surface of carbon nanotubes was modified with the gold nanoparticles with the help of the plasmon resonance effect. It enhances light absorption and localized electric field. The prepared 20×20μm square arrayed carbon nanotubes are modified with gold nanoparticles. By testing its photoelectronic emission performance, the quantum efficiency of the carbon nanotubes photoelectric cathode can reach 4.98×10^-5 irradiating with a continuous laser and a femtosecond pulsed laser.更多还原