Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4938006
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Funding
- National Key Basic Research Program of China [2010CB327703, 2013CB933601]
- National Natural Science Foundation of China [60925001]
- Fundamental Research Funds for the Central Universities
- Science and Technology Department of Guangdong Province
- Guangzhou Science Technology and Innovation Commission
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A transmission type flat-panel X-ray source in diode structure was fabricated. Large-scale patterned ZnO nanowires grown on a glass substrate by thermal oxidation were utilized as field emitters, and tungsten thin film coated on silica glass was used as the transmission anode. Uniform distribution of X-ray generation was achieved, which benefited from the uniform electron emission from ZnO nanowires. Self-ballasting effect induced by the intrinsic resistance of ZnO nanowire and decreasing of screening effect caused by patterned emitters account for the uniform emission. Characteristic X-ray peaks of W-L lines and bremsstrahlung X-rays have been observed under anode voltages at a range of 18-20 kV, the latter of which were the dominant X-ray signals. High-resolution X-ray images with spatial resolution less than 25 mu m were obtained by the flat-panel X-ray source. The high resolution was attributed to the small divergence angle of the emitted X-rays from the transmission X-ray source. (C) 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
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