N-doped graphene sheets induced high electrochemical activity in carbon film

被引:20
作者
Huang, Liangliang [1 ,2 ]
Cao, Yuanyuan [1 ]
Diao, Dongfeng [1 ]
机构
[1] Shenzhen Univ, INSE, Guangdong Prov Key Lab Micro Nano Optomechatron E, Shenzhen 518060, Peoples R China
[2] Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China
基金
中国博士后科学基金;
关键词
Carbon film; N-doped graphene sheets; Electrochemical activity; Biosensor; ELECTRON-TRANSFER KINETICS; PERFORMANCE; SITES; BORON;
D O I
10.1016/j.apsusc.2018.11.075
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, we prepared a carbon film with clearly shaped N-doped graphene sheets by electron cyclotron resonance (ECR) plasma sputtering under low-energy electron irradiation. We found the N-doped graphene sheets remarkably improved the electrochemical activity of carbon film. The charge-transfer resistance was decreased from 21.62 Omega cm(2) to 1.37 Omega cm(2), and the redox peak separation was reduced to a low value of 65.4 mV in Fe(CN)(6)(4-/3-) redox system. The high electrochemical activity of N-doped graphene sheets embedded carbon (N-GSEC) films was ascribed to the formation of smaller sized N-doped graphene sheets. The smaller sized N-doped graphene sheets with high electronic density of states produced abundant edge defects, which served as active sites, facilitated the adsorption of Fe(CN)(6)(4-/3-) on film surface and enhanced the electron transfer. In detecting DNA base of adenine, the N-GSEC film showed a low oxidation potential and high sensitivity. These results demonstrate the N-GSEC film is a promising candidate material for construction sensitivity electrochemical biosensor.
引用
收藏
页码:205 / 211
页数:7
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