聚乙烯亚胺功能化碳纳米管负载铂@金核壳纳米粒子的过氧化氢传感器  

A Hydrogen Peroxide Sensor Based on Pt@Au Nanoparticles Loading to Polyethyleneimine Functionalized Carbon Nanotubes

作　　者：汪维维[1] 裘宇[1] 张少鹏[1] 李嘉伟[1] 卢小泉[1] 刘秀辉[1] 

机构地区：[1]甘肃省生物电化学与环境分析重点实验室,西北师范大学化学化工学院,兰州730070

出　　处：《分析化学》2014年第6期835-841,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(Nos.21245004,20875077);国家留学基金资助~~

摘　　要：实验以聚乙烯亚胺（PEI）功能化的多壁碳纳米管（MWNTs）作为生长基质,电沉积金纳米粒子（AuNPs）作为晶种,采用种子介导生长法在玻碳电极（GCE）上生长铂纳米粒子（PtNPs）,以此制备了一种新型的过氧化氢（H2O2）传感器。利用电化学方法和冷场发射扫描电镜（FESEM）对此修饰电极（Pt@Au/PEIMWNTs/GCE）进行了表征。示差脉冲实验表明,该电极对H2O2有优异的电催化效果,在9.2×10^-8-2.1×10^-3mol/L范围内H2O2的浓度与电流响应呈线性关系,线性相关系数0.9994,检出限3.1×10^-8mol/L（S/N=3）。A novel hydrogen peroxide sensor was fabricated by the seed-mediated growth method. First, polyethyleneimine（ PEI） functionalized multiwalled carbon nanotubes（ MWNTs） were used as growth scaffold on the glass carbon electrode（ GCE）. Then,Au nanoparticles were electrodeposited uniformly as seeds. Finally,Pt nanoparticles（ PtNPs） grew on Au nanoparticles to form Pt @ Au core-shell structure nanocomposite. A new type of electrochemical sensor based on Pt @ Au / PEI-MWNTs nanocomposites for detection of hydrogen peroxide was developed,and the designed Pt@ Au / PEI-MWNTs / GCE was characterized by electrochemical methods and field emission scanning electron microscopy（ FESEM）. The Differential pulse experimental results showed that the modified electrode exhibited excellent electrocatalytic activity towards the reduction of H2O2with the wide linear range from 9. 2 × 10^-8mol / L to 1. 3 × 10^-3mol / L. The correlation coefficient was 0. 9994 and the low detection limit was 3. 1 × 10^-8mol / L at the signal-to-noise of 3.

关 键 词：种子介导法 聚乙烯亚胺 功能化碳纳米管 铂@金核壳纳米粒子 修饰电极 过氧化氢 

分 类 号：O657.1[理学—分析化学]