Pulsed voltage driving enhanced electron emission in ZnO nanowire cold cathode flat-panel X-ray source

被引：15

作者：

Zhao, Yangyang ^{[1
]}

Chen, Yicong ^{[1
]}

Zhang, Guofu ^{[1
]}

Huang, Deyi ^{[1
]}

Zhan, Runze ^{[1
]}

Deng, Shaozhi ^{[1
]}

Xu, Ningsheng ^{[1
]}

Chen, Jun ^{[1
]}

机构：

[1] Sun Yat Sen Univ, Sch Elect & Informat Technol, State Key Lab Optoelect Mat & Technol, Guangdong Prov Key Lab Display Mat & Technol, Guangzhou 510275, Peoples R China

来源：

VACUUM | 2022年 / 199卷

基金：

中国国家自然科学基金;

关键词：

Flat -panel X-ray source; Pulsed field emission; ZnO nanowire; FIELD-EMISSION; CARBON NANOTUBES; THERMAL-OXIDATION; ZINC-OXIDE; ARRAYS; AREA; MECHANISM;

D O I：

10.1016/j.vacuum.2022.110970

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A fully vacuum-sealed flat-panel X-ray source was fabricated composed of molybdenum metal anode and ZnO nanowire field emitters array cathode. The cathode current and X-ray radiation dose rate of the device were measured when the anode is applied with direct current (DC) and pulsed voltage, respectively. It is found that the peak emission current and corresponding dose rate under pulsed voltage driving are much higher than those under DC voltage driving. The phenomena may be explained by a plasma induced field emission enhancement related to the electron bombardment induced gas desorption. Clear projection X-ray imaging of moving objects was obtained using pulsed voltage driving. The result shows that owing to the enhanced emission current driven by the pulsed voltage, the flat-panel X-ray source can achieve fast and clear imaging of high-speed moving objects. Our results are of significance for the application of large area flat-panel X-ray source in dynamic imaging.

引用

页数：12

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