Laser-induced Microball in Well-aligned CuO Nanowire
Cheng-Hao Chuang (莊程豪)1, Chia-Hao Chen (陳家浩)2, Chih-Wei Peng (彭治維)1,2 ,
Shen-Shing Wong (翁聖勛) 1, Nae-Yeou Jih (紀乃友)1, Ping-Yao Lin (林平堯) 2, Yanwu Zhu3,
Chorng-Haur Sow3, and Minn-Tsong Lin (林敏聰)1,4
1
Department of Physics, National Taiwan University, Taipei, Taiwan
National Synchrotron Radiation Research Center, Hsinchu, Taiwan
3
Department of Physics, National University of Singapore, Singapore
4
Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan
2
One-dimensional nanomaterials which are able to control configuration or pattern are much
valuable in application of useful device, e.g. sensors, optoelectronics, and field emission devices.
Simple focused laser technology can provide an effective method to modify the nanomaterial
surface and the corresponding electronic structure. When laser beam is focused on CuO film, it can
trim away the top of CuO nanowires and locally melt nanowires into a single nanorod with a
microball on the top. The surface tension of the molten material results in a spherical shape after
cooling down. In addition, the size distribution of molten CuO depends on the laser energy
distribution. Therefore, we focused on the electronic structure difference between the as-grown 1D
nanowires and laser-induced 0D microballs with different size. Using the spatial resolved
micro-XPS, we can identify the electronic structure in the specific location related to CuO
nanowires and microball.