对阳极氧化后的掺硼金刚石(BDD)薄膜进行表面氨基化处理,使柠檬酸根包裹的纳米金颗粒(粒径约18 nm)自组装到 BDD 薄膜的表面.通过改变纳米金溶液的 pH 值,在 BDD 薄膜表面制备出二维形貌分布均匀且相对覆盖度高(约30％)的纳米金颗粒.在[Fe(CN)6]3－/4－体系中,通过循环伏安分析和交流阻抗分析实验发现,纳米金颗粒修饰后的 BDD 电极表面异相电子转移速率常数(K app )由2．8×10－4提高到8．9×10－4.纳米金颗粒修饰的 BDD 电极对多巴胺的氧化电位由0．54 V 减小到0．3 V,且氧化峰峰值得到提高,证实了纳米金颗粒对多巴胺的催化作用.
Citrate-coated gold nanoparticles (diameter about 18 nm)were absorbed onto boron-doped diamond (BDD)film electrode through a self-assembly process after the surface of the anodized BDD film was animated. By changing the pH of gold nanoparticles solution,we synthesized gold nanoparticles modified BDD electrode with uniform distribution and high coverage (about 30%) of gold nanoparticles.In the system of [Fe (CN)6 ]3 -/4- ,through AC impedance analysis and cyclic voltammetry analysis,we find that heterogeneous elec-tron transfer rate constant (K app )of gold nanoparticles modified BDD electrode increased from 2.8 × 10 -4 to 8.9×10 -4 .After the BDD electrode was modified with gold nanoparticles,the oxidation potential of dopamine (DA)reduced from 0.54 to 0.3 V,and the oxidation peak was improved,confirming that gold nanoparticles have catalytic effect on DA.
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