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

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(H2 O2)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/ PEI-MWNTs/ GCE)进行了表征。示差脉冲实验表明,该电极对 H2 O2有优异的电催化效果,在9.2×10-8~2.1×10-3 mol/ L 范围内 H2 O2的浓度与电流响应呈线性关系,线性相关系数0.9994,检出限3.1×10-8 mol/ 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 H2 O2 with the wide linear range from 9. 2 ×10-8 mol/ L to 1. 3 ×10-3 mol/ L. The correlation coefficient was 0. 9994 and the low detection limit was 3. 1×10-8 mol/ L at the signal-to-noise of 3.