核壳结构Au-Pd纳米花的制备及其用于多巴胺的电化学检测

Preparation of Au-Pd core-shell nanodendrites and their application for electrochemical detection of dopamine

以CTAC包被的金纳米球作为种子,制备了尺寸为40 nm的核壳结构Au-Pd纳米花。通过吸附聚丙烯酸(PAA),得到了电负性的Au-Pd/PAA纳米颗粒。并用透射电子显微镜(TEM)、高分辨TEM、zeta电位仪和傅里叶变换红外光谱仪(FT-IR)对制备的纳米颗粒进行了表征。为了研究核壳结构Au-Pd纳米颗粒的催化能力,制备了Au-Pd/PAA修饰的玻碳电极,并用于多巴胺的电化学检测,多巴胺的线性范围为1.0×10-6~7.0×10-5mol/L,检出限为5.0×10^(-7)mol/L。

Using CTAC-capped gold nanoparticles as seeds,core-shell Au-Pd nanodendrites with size of 40 nm were prepared. By adsorption of polyacrylic acid（ PAA）,negatively charged Au-Pd / PAA was obtained. The asprepared nanoparticles were characterized by transmission electron microscopy（ TEM）,high-resolution TEM,zeta potential measurements and infrared absorption. To investigate the catalytic ability of core-shell Au-Pd nanodendrites,Au-Pd / PAA modified glass carbon electrode was prepared and used for dopamine determination.The linear range of dopamine detection was 1. 0 × 10- 6~ 7. 0 × 10- 5mol / L. The detect limit was 5. 0 ×10- 7mol / L.