中国物理B ›› 2015, Vol. 24 ›› Issue (5): 57102-057102.doi: 10.1088/1674-1056/24/5/057102

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Experimental and theoretical study on field emission properties of zinc oxide nanoparticles decorated carbon nanotubes

李昕, 周伟满, 刘卫华, 王小力   

  1. Department of Microelectronics, Xi'an Jiaotong University, Xi'an 710049, China
  • 收稿日期:2014-10-03 修回日期:2014-12-30 出版日期:2015-05-05 发布日期:2015-05-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 91123018, 61172040, and 61172041) and the Natural Science Foundation of Shaanxi Province, China (Grant No. 2014JM7277).

Experimental and theoretical study on field emission properties of zinc oxide nanoparticles decorated carbon nanotubes

Li Xin (李昕), Zhou Wei-Man (周伟满), Liu Wei-Hua (刘卫华), Wang Xiao-Li (王小力)   

  1. Department of Microelectronics, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2014-10-03 Revised:2014-12-30 Online:2015-05-05 Published:2015-05-05
  • Contact: Li Xin E-mail:lx@mail.xjtu.edu.cn
  • About author:71.55.-i; 71.15.Mb; 73.23.Ad; 73.63.Fg
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 91123018, 61172040, and 61172041) and the Natural Science Foundation of Shaanxi Province, China (Grant No. 2014JM7277).

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摘要： Field emission properties of zinc oxide (ZnO) nanoparticles (NPs) decorated carbon nanotubes (CNTs) are investigated experimentally and theoretically. CNTs are in situ decorated with ZnO NPs during the growth process by chemical vapor deposition using a carbon source from the iron phthalocyanine pyrolysis. The experimental field emission test shows that the ZnO NP decoration significantly improves the emission current from 50 μA to 275 μA at 550 V and the reduced threshold voltage from 450 V to 350 V. The field emission mechanism of ZnO NPs on CNTs is theoretically studied by the density functional theory (DFT) combined with the Penn–Plummer method. The ZnO NPs reconstruct the ZnO–CNT structure and pull down the surface barrier of the entire emitter system to 0.49 eV so as to reduce the threshold electric field. The simulation results suggest that the presence of ZnO NPs would increase the LDOS near the Fermi level and increase the emission current. The calculation results are consistent with the experiment results.

关键词: carbon nanotubes (CNTs), ZnO, field emission, Penn–, Plummer model

Abstract: Field emission properties of zinc oxide (ZnO) nanoparticles (NPs) decorated carbon nanotubes (CNTs) are investigated experimentally and theoretically. CNTs are in situ decorated with ZnO NPs during the growth process by chemical vapor deposition using a carbon source from the iron phthalocyanine pyrolysis. The experimental field emission test shows that the ZnO NP decoration significantly improves the emission current from 50 μA to 275 μA at 550 V and the reduced threshold voltage from 450 V to 350 V. The field emission mechanism of ZnO NPs on CNTs is theoretically studied by the density functional theory (DFT) combined with the Penn–Plummer method. The ZnO NPs reconstruct the ZnO–CNT structure and pull down the surface barrier of the entire emitter system to 0.49 eV so as to reduce the threshold electric field. The simulation results suggest that the presence of ZnO NPs would increase the LDOS near the Fermi level and increase the emission current. The calculation results are consistent with the experiment results.

Key words: carbon nanotubes (CNTs), ZnO, field emission, Penn–Plummer model

中图分类号:  (Impurity and defect levels)

  • 71.55.-i
71.15.Mb (Density functional theory, local density approximation, gradient and other corrections) 73.23.Ad (Ballistic transport) 73.63.Fg (Nanotubes)