摘要
在纳米金表面原位沉积普鲁士蓝,然后在核壳结构纳米金-普鲁士蓝的表面包覆一层易氧化聚合的多巴胺保护膜,利用多巴胺聚合表面残留的大量氨基和羟基进一步将纳米铂粒子修饰于聚多巴胺膜表面制得普鲁士蓝-聚多巴胺-纳米铂多层纳米复合材料。将此复合材料修饰于金电极表面,协同使用辣根过氧化物酶用于H_2O_2浓度的检测。结果表明:聚多巴胺的引入有效增加了普鲁士蓝的稳定性,增大了纳米铂的负载量以及辣根过氧化物酶的生物活性;由于普鲁士蓝、纳米铂和辣根过氧化物酶的多重信号放大作用,酶功能化纳米复合材料修饰电极对H_2O_2表现出良好的电还原活性。优化条件下,对H_2O_2的检测范围为2.0×10^(-7)~1.0×10^(-3)mol·L^(-1),检出限(S/N=3)为1.2×10^(-7)mol·L^(-1)。
In this paper, prussian blue (PB) coated gold nanoparticles ( Au NPs) were firstly pre- pared by in situ method. Then, polydopamine (PDA) wrapped Au - PB was synthesized based on the characteristic of one-step oxidative polymerization of dopamine. The bioinspired surface enriched amino and hydroxyl groups were further used as a support to anchor active platinum nanoparticles (Pt NPs). Horseradish peroxidase (HRP) functionalized Au - PB - PDA - Pt nanocomposites was also used for the fabrication of H2O2 biosensor. By taking advantages of the excellent biocompatibility and film forming ability of PDA, the large surface area and high biocompatibility of Pt NPs, and the syn- ergistic employ of PB, Pt and HRP, the HRP functionalized nanocomposites modified electrode exhibited an excellent electroreduction activity to H2O2. Under the optimum conditions, the linear de- tection range from 2.0×10-7 -- 1.0 × 10-3 mol·L-1 was observed, and a detection limit was 1.2× 10-7 mol · L-1
出处
《分析测试学报》
CAS
CSCD
北大核心
2016年第10期1289-1294,共6页
Journal of Instrumental Analysis
基金
国家自然科学基金资助项目(21065009)
教育部重点资助项目(210251)
兵团重点领域创新团队计划(2015BD003)
作者简介
通讯作者:洪成林,教授,研究方向:纳米材料和电化学分析,Tel:0993—2057270,E-mail:hcl_tea@shzu.edu.cn
齐誉,研究方向:有机及电化学分析,Tel:0993—2057270,E-mail:qy_01tea@shzu.edu.eft