Zhao Jiuzhou, Li Zhenjun, Cole Matthew Thomas, Wang Aiwei, Guo Xiangdong, Liu Xinchuan, Lyu Wei, Teng Hanchao, Qv Yunpeng, Liu Guanjiang, Chen Ke, Zhou Shenghan, Xiao Jianfeng, Li Yi, Li Chi, Dai Qing
Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
CAS Key Laboratory of Nanophotonic Materials and Devices, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.
Nanomaterials (Basel). 2021 Nov 29;11(12):3244. doi: 10.3390/nano11123244.
The nanocone-shaped carbon nanotubes field-emitter array (NCNA) is a near-ideal field-emitter array that combines the advantages of geometry and material. In contrast to previous methods of field-emitter array, laser ablation is a low-cost and clean method that does not require any photolithography or wet chemistry. However, nanocone shapes are hard to achieve through laser ablation due to the micrometer-scale focusing spot. Here, we develop an ultraviolet (UV) laser beam patterning technique that is capable of reliably realizing NCNA with a cone-tip radius of ≈300 nm, utilizing optimized beam focusing and unique carbon nanotube-light interaction properties. The patterned array provided smaller turn-on fields (reduced from 2.6 to 1.6 V/μm) in emitters and supported a higher (increased from 10 to 140 mA/cm) and more stable emission than their unpatterned counterparts. The present technique may be widely applied in the fabrication of high-performance CNTs field-emitter arrays.
纳米锥形碳纳米管场发射体阵列（NCNA）是一种近乎理想的场发射体阵列，它结合了几何形状和材料的优点。与以前的场发射体阵列方法相比，激光烧蚀是一种低成本且清洁的方法，不需要任何光刻或湿化学处理。然而，由于微米级聚焦光斑，通过激光烧蚀很难实现纳米锥形形状。在此，我们开发了一种紫外（UV）激光束图案化技术，利用优化的光束聚焦和独特的碳纳米管 - 光相互作用特性，能够可靠地实现锥尖半径约为300 nm的NCNA。与未图案化的对应物相比，图案化阵列的发射体具有更小的开启场（从2.6 V/μm降低到1.6 V/μm），并支持更高（从10 mA/cm增加到140 mA/cm）且更稳定的发射。本技术可广泛应用于高性能碳纳米管场发射体阵列的制造。
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