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High Field Emission Performance of Needle‐on‐Fiber Hierarchical‐Structure ZnO
Author(s) -
Liu Yanxia,
Xie Yizhu,
Chen Jiangtao,
Liu Jing,
Gao Caitian,
Yun Chao,
Lu Bingan,
Xie Erqing
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04734.x
Subject(s) - field electron emission , materials science , electrospinning , cathode , nanofiber , fiber , current density , nanotechnology , chemical engineering , optoelectronics , composite material , polymer , chemistry , physics , quantum mechanics , electron , engineering
Hierarchical‐structure ZnO consisting of ZnO nanoneedles on ZnO nanofibers was fabricated by a two‐step procedure – first electrospinning and then aqueous solution processes. Field emission ( FE ) property of the needle‐on‐fiber hierarchical‐structure ZnO was tested. The low turn‐on field of the field emission at 4.8 V/μm was obtained with the current density of 10 μA/cm 2 . The field enhancement factor was estimated as high as 3400. Such high FE performances of the hierarchical‐structure ZnO derived from the tapered‐tip structure of the ZnO nanoneedles, the high aspect ratio of the hierarchical structure and the undulant space distribution of the ZnO nanoneedles. These results would benefit the potential application of the hierarchical‐structure ZnO in cold‐cathode‐based devices.