N-doped graphene sheets induced high electrochemical activity in carbon filmViews [1547] Delivery time :2018-11-14 10:56:13

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

Applied Surface Science 470 (2019) 205–211（PDF-File）

Liangliang Huang ， Yuanyuan Cao  , Dongfeng Diao*

In this study, we prepared a carbon film with clearly shaped N-doped graphene sheets by electron cyclotron  esonance (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 Ω·cm2 to 1.37 Ω·cm2 , 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.