摘要
金刚石/石墨烯复合薄膜电极因能发挥金刚石的低背景电流和宽电势窗口,且兼具石墨烯的高电化学活性,引起了人们的广泛关注.本文采用氩/氧等离子体对纳米金刚石/石墨复合薄膜进行刻蚀,通过改变刻蚀时间调控薄膜表面的石墨层数,获得少层石墨烯包覆纳米金刚石的表面结构,进而构建少层石墨烯包覆纳米金刚石的表层和石墨组分较多的导电性良好的底层,形成双层结构.结果表明,氩/氧等离子体处理时间达到5 min时,薄膜表层石墨组分被刻蚀成少层石墨包覆纳米金刚石的结构,增大了电阻率(2918.3Ω·cm)及电势窗口(3.43 V);并且表面态由氢终止转变成氧终止,使金刚石晶粒具有正电子亲和势,电化学活性面积从387μC/cm^(2)增加到2893μC/cm^(2).随着处理时间继续延长至20 min时,薄膜表面的石墨层数不断减少,裸露的金刚石相含量增多,薄膜的电阻率增加,电化学活性面积减少;当刻蚀时间达到25 min时,复合薄膜下层石墨层暴露,金刚石表面的石墨转变为少层石墨烯,形成少层石墨烯包覆金刚石的顶层和石墨底层的双层结构,使得电化学活性再次提升(775μC/cm^(2)),并降低了复合薄膜的电阻率(1060.0Ω·cm)并拓宽电势窗口(3.50 V).本研究提供了一种等离子体刻蚀制备纳米金刚石/石墨烯复合电极的新方法,为充分发挥金刚石/石墨烯的协同效应提供了新思路.
The diamond/graphene composite electrode has garnered significant attention due to its ability to synergistically combine the low background current and broad potential window of the diamond component with the high electrochemical activity of the graphitic component.In this study,argon-oxygen plasma etching is employed to treat nanodiamond/graphite composite films,and the surface structure of the few-layer graphene-coated nanodiamond is obtained by adjusting the etching time to control the number of graphite layers on the surface of the film,and then the surface layer of the few-layer graphene-coated nanodiamond and the bottom layer with good conductivity with more graphite components are constructed to form a double-layer structure.The experimental findings demonstrate that when the argon/oxygen plasma treatment time reaches 5 min,the graphite components on the surface layer of the film are etched into a structure of small-layer graphite coated nanodiamond,which increases the resistivity(2918.3 W·cm)and potential window(3.43 V).In addition,the surface state is changed from hydrogen termination to oxygen termination,so that the diamond grain has a positron affinity potential,and the electrochemical active area increases from 387 to 2893μC/cm2.As the treatment time continues to extend to 20 min,the number of graphite layers on the surface of the film decreases,the diamond phase content increases,the resistivity of the film increases,and the electrochemically active area decreases.When the etching time reaches 25 min,the graphite layer under the composite film is exposed,and the graphite on the surface of the diamond is transformed into few-layer graphene,forming a double-layer structure of the top layer of few-layer graphene-coated diamond and the bottom layer of graphite,which synergistically improves the electrochemical activity(775μC/cm2),reduces the resistivity of the composite film(1060.0 W·cm)and broadens the potential window(3.50 V).This work provides a novel plasma-etching strategy for fabricating diamond/graphene hybrid electrodes,and new insights into using the complementary advantages of these carbon allotropes for advanced electrochemical applications.
作者
姜波
张建平
蒋梅燕
陈爱盛
胡晓君
JIANG Bo;ZHANG Jianping;JIANG Meiyan;CHEN Aisheng;HU Xiaojun(College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Moganshan Diamond Research Center,Deqing 313200,China;Diamond Joint Research institute for Zhejiang University of Technology and Tanghe Scientific&Technology Company,Deqing 313200,China;Moganshan Institute of Zhejiang University of Technology,Deqing 313200,China)
出处
《物理学报》
北大核心
2025年第16期389-397,共9页
Acta Physica Sinica
基金
国家自然科学基金-浙江省两化融合联合重点项目(批准号:U1809210)
国家国际科技合作专项(批准号:2014DFR51160)
浙江省重点研发计划国际合作“一带一路”专项(批准号:2018C04021)
国家自然科学基金(批准号:52102052)
浙江大学温州研究院横向项目(批准号:XMGL-CX-202305,XMGL-KJZX-202307)
唐合科技公司项目(批准号:KYY-HX-20230024)资助的课题。
