纳米金/碳催化剂的合成及其在多巴胺电化学检测中的应用(英文)

建立了一种合成碳负载型金纳米颗粒(AuC)的新方法.将酵母菌、葡萄糖及HAuCl4溶液混合后置于恒温摇床中,在310K下振荡数天得到酵母菌吸附的金前体盐(AuY);将AuY在氮气气氛中1 273K下煅烧得到AuC.采用扫描电镜和透射电镜观察了AuC的形貌;将AuC修饰在玻碳电极上并用于多巴胺的电化学检测.结果表明,AuY培养3d后,其酵母菌颗粒粒径分布不均匀,这主要是由于大量葡萄糖的吸附和包裹以及酵母孢子的存在所致;而AuY培养6d后得到的金颗粒粒径分布均匀,粒径约为10nm.此外,AuC在多巴胺电化学检测中具有非常好的响应,且检出限较低,其电化学过程为混合动力学控制过程.

Synthesis of gold nanoparticles/carbon catalyst and its applicaton in electrochemical detection of dopamine

A new method has been developed for the synthesis of carbon-supported gold nanoparticles（denoted as AuC）.Thus yeast,glucose and HAuCl4 solution were mixed with a shaker under 310 Kfor several days to afford precursor salt of gold adsorbed by yeast（coded as AuY）.Resultant AuY was calcinated in N2 at 1 273 Kaffording title catalyst.The morphology of the product was observed with a scanning electron microscope and a transmission electron microscope.Furthermore,as-prepared AuC was introduced onto the surface of glassy carbon electrode generating AuC-modified glassy carbon electrode for the electrochemical detection of dopamine.It was found that,after AuY precursor was cultured for 3d,the size of the yeast is not uniform because of the absorption and package of plenty of glucose and the existence of many yeast spores.The size of gold nanoparticles in AuY cultured for 6dis about 10 nm,and they are uniformly dispersed on the carbon substrate.In the meantime,AuC-modified glassy electrode shows excellent response to the electro-oxidation of dopamine and has a low detection limit,while its electrochemical process is dominated by a hybrid kinetic mechanism.