We found that nanosized graphene sheets induced high electrochemical activity in pure carbon films, which prepared by electron cyclotron resonance (ECR) plasma sputtering under low-energy electron irradiation condition. The electrochemical properties were studied by electrochemical impedance spectroscopy and cyclic voltammetry. The graphene sheets embedded carbon (GSEC) films showed a wide potential window over 3.2 V. The charge transfer resistance and the oxidation-reduction peak separation (ΔE_P) of the GSEC films are lower than amorphous carbon films in several redox systems (Fe(CN)₆^4−/3-, Ru(NH₃)₆^2+/3+, dopamine and ascorbic acid), especially in the inner-sphere system, the ΔE_P is only half of amorphous carbon films. The high electrochemical activity of GSEC films originated from the nanosized graphene sheets, which offered faster electron transfer path and more reaction active sites. Our results indicate the GSEC films have great potential to be an electrochemical biosensor in detecting biomolecules with high oxidation potential.

我们发现，纳米石墨烯片在纯碳膜中具有较高的电化学活性，这是在低能电子辐照条件下通过电子回旋共振（ECR）等离子体溅射制备的。通过电化学阻抗谱和循环伏安法研究了电化学性能。石墨烯片嵌入碳（GSEC）片显示宽电位窗超过3.2V。电荷转移电阻和氧化-还原峰的分离（ΔE _P的GSEC膜）比在几个氧化还原体系的非晶碳膜低铁（Fe（ CN）₆ ^{4- / 3-}，钌（NH ₃）₆ ^{2 + / 3 +}，多巴胺和抗坏血酸），特别是在所述内球的系统，所述ΔE _P仅是非晶碳膜的一半。GSEC膜的高电化学活性源自纳米级石墨烯片，它提供了更快的电子传输路径和更多的反应活性位点。我们的结果表明，GSEC膜在检测具有高氧化电位的生物分子方面具有巨大的潜力，可作为电化学生物传感器。