电子元件与材料2025，Vol.44Issue(6)：642-648,7.DOI:10.14106/j.cnki.1001-2028.2025.1509
柱面型CNTs阵列制备及电子发射特性研究
Preparation of cylindrical CNTs arrays and their electron emission characteristics
摘要
Abstract
The cathode is the core component of vacuum electronic devices that can directly affect the device efficiency.Compared with traditional thermal electron emission cathodes,cold cathodes have advantages such as no heating requirements,higher emission efficiency,and faster startup.Among them,cylindrical cold cathodes have broad applications in small magnetrons.To address the issue that the traditional cylindrical cathodes cannot meet the high-performance requirements of magnetrons,a novel cylindrical carbon nanotube(CNT)array cold cathode was fabricated on a copper tube substrate by using pressure injection technology.The field emission performance was evaluated using a coaxial nested diode structure.Results indicate that,under the optimal emission condition,the turn-on field strength is 0.6 V/μm,and a current of 10 mA(current density is about 26.02 mA/cm2)is achieved at a field strength of 1.77 V/μm.Compared with existing cylindrical cold cathodes,it has the advantages of simple fabrication,low power consumption,and superior electron emission performance.The array distribution of the macroscopic CNT emission region and the irregularity of the microscopic CNT distribution can simultaneously avoid the electromagnetic shielding and improve the current extraction capacity.Moreover,the addition of SrO can reduce the potential barrier for electrons to escape from the cathode surface,which further improves the electron emission characteristics of the cold cathode of the cylindrical CNT array.The findings of this study contribute to the development of cold cathode magnetrons.关键词
柱面型/碳纳米管阵列冷阴极/直流场发射/磁控管Key words
cylindrical/carbon nanotube array cold cathode/DC field emission/magnetron分类
信息技术与安全科学引用本文复制引用
秦鑫垚,曾凡光,夏欢欢,麻华丽,霍海波,杨鹏..柱面型CNTs阵列制备及电子发射特性研究[J].电子元件与材料,2025,44(6):642-648,7.基金项目
河南省自然科学基金(232300420097) （232300420097）
河南省科技攻关项目(232102231055,242102220001,242102240068) （232102231055,242102220001,242102240068）
