CAJ | 학술논문

通过3-巯丙基三乙氧基硅烷( METMS)将氧化石墨烯( GO)固载到玻碳电极( GCE)表面,用电化学方法还原GO制备石墨烯修饰玻碳电极( rGO-METMS-GCE )。利用傅里叶变换红外光谱( FTIR )、拉曼光谱( Raman)、扫描电子显微镜( SEM)和原子力显微镜( AFM)等技术对GO和rGO-METMS-GCE的结构和表面形貌进行表征。采用循环伏安( CV)和差分脉冲溶出伏安( DPV)法研究了rGO-METMS-GCE对多巴胺( DA)的电催化氧化性能及反应机理。结果表明,与裸GCE相比, DA在rGO-METMS-GCE电极上的氧化还原峰电流( ipa和ipc )增大4倍,氧化峰电位负移106 mV,氧化峰与还原峰电位差(驻Ep )从202 mV降低至66 mV, DA电化学氧化可逆性明显改善,表明 rGO-METMS-GCE 对 DA 电化学氧化具有显著电催化作用。 DA 在rGO-METMS-GCE上的反应机理为单电子转移过程。
통과3-구병기삼을양기규완( METMS)장양화석묵희( GO)고재도파탄전겁( GCE)표면,용전화학방법환원GO제비석묵희수식파탄전겁( rGO-METMS-GCE )。이용부리협변환홍외광보( FTIR )、랍만광보( Raman)、소묘전자현미경( SEM)화원자력현미경( AFM)등기술대GO화rGO-METMS-GCE적결구화표면형모진행표정。채용순배복안( CV)화차분맥충용출복안( DPV)법연구료rGO-METMS-GCE대다파알( DA)적전최화양화성능급반응궤리。결과표명,여라GCE상비, DA재rGO-METMS-GCE전겁상적양화환원봉전류( ipa화ipc )증대4배,양화봉전위부이106 mV,양화봉여환원봉전위차(주Ep )종202 mV강저지66 mV, DA전화학양화가역성명현개선,표명 rGO-METMS-GCE 대 DA 전화학양화구유현저전최화작용。 DA 재rGO-METMS-GCE상적반응궤리위단전자전이과정。
The graphene oxide( GO) bonded on glass carbon electrode( GCE) using 3-mercaptopropyol trime-thoxysilane( METMS) as molecular bridge were electrochemically reduced to reduced graphene oxide( rGO) to form graphene modified glass carbon electrode( rGO-METMS-GCE). GO-METMS-GCE and rGO-METMS-GCE were characterized by SEM, FTIR, Raman spectroscopy and AFM. The electrochemical performances of rGO-METMS-GCE were studied by cyclic voltammetry( CV) and differential voltammetry( DPV). The results show that the electrocatalytic oxidation current of dopamine( DA) on rGO-METMS-GCE is about 4 times that on bare GCE. The oxidation and reduction potential difference(△Ep) of rGO-METMS-GCE is 66 mV, lower than that of bare GCE(202 mV). The rGO-METMS-GCE has remarkable electrocatalytic activity toward dopa mine oxi-dation and the redox reversibility of dopamine on the rGO-METMS-GCE is improved greatly.