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Title: Improvement of field emission properties of α-Fe{sub 2}O{sub 3} nanoflakes due to the lowered back contact barrier after high energy X-ray irradiation

Improvement in the field emission properties of α-Fe{sub 2}O{sub 3} nanoflakes is observed after high energy X-ray irradiation from synchrotron radiation. Field emission threshold field of α-Fe{sub 2}O{sub 3} nanoflakes is found to decrease from 10.1 to 7.8 MV/m after X-ray irradiation with the dose of 9.0 × 10{sup 14} phs/cm{sup 2}. Electrical measurement reveals that the potential barrier at the back contact between the α-Fe{sub 2}O{sub 3} layer and the iron substrate changes after X-ray irradiation. The observed threshold field decrease is well explained by the changes in potential barrier at the back contact of α-Fe{sub 2}O{sub 3} nanoflakes, which indicates the back contact plays an important role in controlling the field emission properties of α-Fe{sub 2}O{sub 3} nanoflakes. Our study shows that the α-Fe{sub 2}O{sub 3} nanoflakes are a promising material for the application as field emitter under X-ray environment.
Authors:
; ; ;  [1] ; ;  [2]
  1. State Key Lab of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275 (China)
  2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
Publication Date:
OSTI Identifier:
22217870
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 18; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ELECTRIC CONDUCTIVITY; FERRITES; FIELD EMISSION; IRON OXIDES; IRRADIATION; LAYERS; NANOSTRUCTURES; SUBSTRATES; SYNCHROTRON RADIATION; X RADIATION