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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.
A new method of synthesizing carbon-supported Au nanoparticles (AuC) was established.The yeasts, glucose and HAuCl4 solutions were mixed and placed in a thermostatic shaker at 310K for several days to obtain the gold precursor salts adsorbed by yeast (AuY). AuY was calcined at 1 273K in a nitrogen atmosphere to obtain AuC. The morphology of AuC was observed by scanning electron microscopy and transmission electron microscopy. AuC was modified on glassy carbon electrode and used for the electrochemical detection of dopamine. The results showed that AuY After 3 days of culture, the size distribution of yeast particles was not uniform, which was mainly caused by the adsorption and encapsulation of a large amount of glucose and the presence of yeast spores. However, the gold particles obtained after 6 days of AuY were evenly distributed with a particle size of about In addition, AuC has a very good response in the dopamine electrochemical detection, and the detection limit is low. The electrochemical process is the hybrid control process.