Journal
APPLIED SURFACE SCIENCE
Volume 493, Issue -, Pages 1299-1305Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.07.149
Keywords
ZnO:Ga nanorod array; Hydrogen plasma treatment; X-ray excited luminescence; Ultrafast; X-ray imaging
Categories
Funding
- China Postdoctoral Science Foundation [2019M651469]
- National Natural Science Foundation of China (NSFC) [11775160, 11375129, 11675121, 51772185, U1832159, 11104298]
- Ministry of Science and Technology of China [2011YQ13001902]
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Vertically aligned and highly uniform ZnO:Ga (1 mol%) nanorod array was fabricated by hydrothermal reaction method and then treated by hydrogen plasma. The results show hydrogen plasma treatment could drastically enhance ultraviolet light emission of ZnO:Ga nanorod arrays with maintaining their morphology, which is extremely important for X-ray imaging with high spatial resolution. Under the excitations of 266 nm laser and Xray, a red-shift of ultraviolet light emission was observed and confirmed to be the internal absorption of ZnO:Ga. A visible light emission in X-ray excited luminescence spectrum revealed that the diffusion of hydrogen in the array had a limited penetration depth. Furthermore, the decay time of the ultraviolet light emission was measured to be less than 1.0 ns. The present work shows the hydrogen plasma treated ZnO:Ga nanorod array can be used as a potential scintillator for the ultrafast and high-spatial-resolution X-ray imaging detectors.
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