• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2023, Vol. 59 ›› Issue (17): 258-267.doi: 10.3901/JME.2023.17.258

• 数字化设计与制造 • 上一篇    下一篇

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纳米结构碳膜的横向载流电接触特性研究

范雪1,2, 王刚1,2, 胡泽龙1,2   

  1. 1. 深圳大学机电与控制工程学院 深圳 518060;
    2. 深圳大学广东省微纳光机电工程技术重点实验室 深圳 518060
  • 收稿日期:2022-09-28 修回日期:2023-02-24 出版日期:2023-09-05 发布日期:2023-11-16
  • 通讯作者: 范雪(通信作者),女,1984年出生,博士,副教授。主要研究方向为微电子器件表面摩擦接触特性,跨尺度表面摩擦特性,界面摩擦机理的透射电镜原位研究。E-mail:fanx@szu.edu.cn
  • 作者简介:王刚,男,1994年出生,硕士。主要研究方向为电接触特性。E-mail:1910293022@email.szu.edu.cn;胡泽龙,男,1996年出生,博士研究生。主要研究方向为多尺度接触摩擦特性及机理。E-mail:2150296001@email.szu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(51975382)。

Electrical Contact Properties of Nanostructured Carbon Films under Transverse Current-carrying Condition

FAN Xue1,2, WANG Gang1,2, HU Zelong1,2   

  1. 1. College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060;
    2. Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, Shenzhen University, Shenzhen 518060
  • Received:2022-09-28 Revised:2023-02-24 Online:2023-09-05 Published:2023-11-16

摘要: 针对非晶碳膜和石墨烯纳晶碳膜两种不同纳米结构碳膜,通过导电金刚石与碳膜接触在薄膜内部产生横向载流,利用电接触纳米压痕测试研究得到石墨烯纳晶碳膜在力电耦合下具有良好的力学和电学稳定性。电流密度对两种纳米结构碳膜的力学性能的影响结果表明:非晶碳膜在电流密度增加时产生结构转变,使其力学性能增加,而石墨烯纳晶碳膜则由于原子密度低,导电性好,在电接触下表现出稳定的力学性能。电接触下的碳膜电学特性研究表明:探针与碳膜接触界面存异质结。随着外加电场强度的增加,两种碳膜的电势势垒呈线性增加;随着载荷增加,材料应变使非晶碳膜电势势垒呈线性增加;而石墨烯纳晶碳膜受应力作用下的能带调制作用较弱,电势势垒稳定,并且由于其扩散电导率较高,在电接触卸载中的电流滞后效应较弱。研究结果为纳米结构碳膜在电接触器件表面的应用提供理论基础。

关键词: 碳膜, 电接触, 力学特性, 电学特性, 纳米结构

Abstract: For the two kinds of carbon films with amorphous and graphene nanocrystallite nanostructures, transverse current-carrying condition is formed when the conductive diamond tip contact with the carbon films. Stable mechanical and electrical properties were obtained for the graphene nanocrystallited carbon films under the mechanical-electrical coupling contact. The effect of current density on the mechanical properties is investigated. Results showed that the elastic modulus and hardness of amorphous carbon film increased with the current density due to the structural transformation, and graphene nanocrystallited carbon films exhibited stable mechanical properties because of the low atomic density and high electric conductivity. Electrical property study showed that heterojunction existed between the tip and the carbon films. With the increase of electric field strength, the potential barrier increased linearly. With the increase of load, the potential barrier increased for the amorphous carbon film with material strain, while it is stable for the graphene nanocrystallited carbon film since the energy band modulation is weak under the stress effect. Besides, ascribed to the high diffused conductivity, the current hysteresis effect was weakened during the unloading process of electrical contact. The outcomes provide a theoretical basis for the application of nanostructured carbon films on the surface of electrical contact devices.

Key words: carbon film, electrical contact, mechanical property, electrical property, nanostructure

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