文章摘要
微生物吸附-化学还原法合成金钯纳米线机理研究
Study on the Mechanism of Synthesis of Gold/Palladium Nanowires by Microbial Adsorption − Chemical Reduction Method
投稿时间:2018-01-01  
DOI:
中文关键词: 材料化学  微生物吸附-化学还原法  金钯纳米线
英文关键词: material chemistry  microbial adsorption and chemical reduction method  gold-palladium nanowires
基金项目:福建省教育厅中青年教科研项目(JAT171117)、莆田市工业科技类科研项目(2016G2020)。
作者单位E-mail
杨海贤 湄洲湾职业技术学院 化学工程系福建 莆田 351200;厦门大学 化学化工学院福建 厦门 361005 yhx507@163.com.cn 
张丽娟 厦门大学 化学化工学院福建 厦门 361005  
黄加乐 厦门大学 化学化工学院福建 厦门 361005  
李清彪 厦门大学 化学化工学院福建 厦门 361005  
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中文摘要:
      采用微生物吸附-化学还原法,以大肠杆菌(ECCs)为模板、十六烷基三甲基溴化铵(CTAB)为保护剂、抗坏血酸(AA)为还原剂制备金钯纳米线(Au-Pd NWs),考察不同金钯摩尔比对合成金钯纳米材料的影响,并通过SEM、TEM、XRD等技术进行了表征,研究其形成机理。结果表明,吸附还原作用使ECCs在短时间内还原生成了少量Pd(0)和Au(0),大量的钯离子和金离子聚集在ECCs表面周围;还原剂AA的加入使ECCs表面成为优先成核位点,菌体表面基团与晶核相互作用阻止其迁移;在CTAB的作用下,菌体表面的纳米颗粒逐渐形成链状纳米中间结构,中间结构通过Ostwald熟化作用进一步形成Au-Pd纳米线。通过ECCs和CTAB协同作用,有利于一维纳米结构的生长。
英文摘要:
      The gold and palladium nanowires (Au-Pd NWs) were prepared by microbial adsorption - chemical reduction method using Escherichia coli (ECCs) as bio-template, cetyltrimthyl ammonium bromide (CTAB) as a protective agent, and ascorbic acid (AA) as a reducing agent, respectively. The influence of different Au/Pd molar ratios on Au-Pd bimetallic nanowire morphology, and their composition was systematically studied. The as-prepared Au-Pd NWs samples were characterized by SEM, TEM and XRD spectroscopy and other technologies. The results show that the ECCs surface provided preferential nucleation sites, which were vital for growth of bimetallic nanoparticles. Through the adsorption and reduction of ECCs, a small amount of Pd(0) and Au(0) were first reduced in a short time, then a large number of Pd and Au ions were gathered around the surface of the ECCs. Upon AA addition, the reduction reaction was greatly accelerated when the Pd and Au ions on the surface of ECCs were reduced to preferential nuclei in a short time. The interaction between ECCs surface and the nuclei prevents their migration, so the metal nuclei could continue to grow. The chainlike intermediate nanostructures were formed on the cells surface in the direction of CTAB. With the addition of new atoms onto intermediate nanostructures, the small nanoparticles were consumed via Ostwald ripening during the crystallization of the chained nanostructures, thus forming nanowires. Therefore, owing to the synergism between ECCs and CTAB, the growth of one dimensional Au-Pd nanostructures was sufficiently promoted.
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