摘要
以葡萄糖为还原剂,采用化学镀原位合成纳米银-石墨烯复合材料(Ag/GR),通过X射线衍射(XRD)、X射线能量色散谱(EDS)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和傅里叶红外光谱(FTIR)等方法对材料的结构形态进行表征分析。结果表明,石墨烯表面银的负载形态为预期的单质状态,AgNPs平均粒径约为21 nm。同时,利用循环伏安法(CV)、交流阻抗谱(EIS)、线性伏安扫描法(LSV)和差分脉冲伏安法(DPV)对抗坏血酸(AA)在Ag/GR/GCE电化学传感器上的电化学响应进行研究。电化学测试结果表明,Ag/GR复合材料具有最高的响应电化学信号212.9μA和最低的电荷转移电阻90.5Ω,峰值电流约为石墨烯电极(110μA)的2倍和玻碳电极(42.5μA)的5倍,AgNPs与石墨烯具有良好的协同作用,对AA具有明显的电催化活性。AA的阳极峰电流在5-120μmol/L浓度范围内线性增加。然而,AA的阳极峰电流与浓度范围为50-120μmol/L的自然对数高度相关,检测限为0.06μmol/L。
Using glucose as the reducing agent,the nano-silver-graphene composite material(Ag/GR)was synthesized in situ by electroless plating,the structural morphology of the material was characterized and analyzed by X-ray diffraction(XRD),X-ray energy dispersive spectroscopy(EDS),X-ray photoelectron spectroscopy(XPS),scanning electron microscope(SEM)and Fourier infrared spectrometry(FTIR).The results show that the loading morphology of silver on the graphene surface is the single state that meets the expectation.The average particle size of AgNPs is about 21 nm.At the same time,the electrochemical response of ascorbic acid(AA)on Ag/GR/GCE electrochemical sensors was studied using the electrochemical test methods of cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS),linear sweep voltammetry(LSV)and differential pulse voltammetry(DPV).The electrochemical test results show that the Ag/GR composite has the highest response electrochemical signal of 212.9μA and the lowest resistance of charge transfer of 90.5Ω.The peak current is about twice that of the graphene electrode(110μA)and about five times that of the glassy carbon electrode(42.5μA).Due to the good synergistic effect of AgNPs and graphene,it has obvious electrocatalytic activity for AA.And the anode peak current and concentration show positive correlation linear change trend in the range of 5-120μmol/L.However,the anode peak current of AA is highly correlated with the natural logarithm of the concentration range from 50μmol/L to 120μmol/L.The low limits of detection is 0.06μmol/L.
作者
李金磊
邓凌峰
张淑娴
谭洁慧
覃榕荣
王壮
LI Jin-lei;DENG Ling-feng;ZHANG Shu-xian;TAN Jie-hui;QIN Rong-rong;WANG Zhuang(School of Materials Science and Engineering,Central South University of Forestry and Technology,Changsha 410004,China;Hunan Province Key Laboratory of Materials Surface and Interface Science and Technology,Central South University of Forestry and Technology,Changsha 410004,China;Hunan Xineng New Material Co.,Ltd.,Changsha 410205,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2021年第8期127-138,共12页
Journal of Materials Engineering
基金
国家自然科学基金重点资助项目(31530009)
湖南省科研创新资助项目(CX2018B458)。
关键词
化学镀
银纳米粒子
石墨烯
抗坏血酸
electroless plating
silver nanoparticle
graphene
ascorbic acid
作者简介
通讯作者:邓凌峰(1970-),男,副教授,博士,主要从事能源材料的研究,联系地址:湖南省长沙市天心区韶山南498号中南林业科技大学研究生院(410004),E-mail:denglingfeng168@126.com。
