金纳米粒子的制备及其在碳钢电极表面自组装研究

摘要

This article describes a simple approach to synthesize Au nanoparticle chains by reducing HAuCl4 with sodium citrate in absence of any additional capping agent or surfactants.UVvis spectrophotometry and scanning electron microscopy (SEM) were employed to characterize assynthesized nanoparticles.The Au nanoparticles were assembled onto the surface of 20 carbon steel electrode by different cross-linking agents such as polyvinylpyrrolidone (PVP),acryl-thiourea (ATU) and thiourea (TU).Polarization curves and electrochemical impedance spectroscopy were used to detect the corrosion inhibition of the self-assembled Au nanoparticle films onto the the carbon steel electrode.The influences of the cross-lingking agents and assemble time on the films were also explored.The results show that all Au nanoparticle films assembled by different cross-linking agents had good corrosion inhibition,in which Au nanoparticles assembled for 12 h by ATU had the highest corrosion inhibition efficiency of 99.15 ％.%在没有使用任何添加剂和保护剂的情况下,采用柠檬酸钠还原氯金酸的方法制备出了链状金纳米粒子,并用紫外可见吸收光谱(UV-vis)和扫描电子显微镜(SEM)对其进行了表征.通过聚乙烯吡咯烷酮(PVP)、丙烯基硫脲(ATU)、硫脲(TU)等不同交联剂将金纳米粒子组装在20号碳钢电极上,并利用极化曲线和电化学阻抗谱等方法,研究了金纳米粒子自组装膜在NaCl溶液中对20号碳钢的缓蚀作用,讨论了不同交联剂、不同金纳米粒子组装时间对缓蚀性能的影响.试验结果表明,使用不同交联剂制备的金纳米粒子自组装膜对20号碳钢都有缓蚀作用,其中尤以丙烯基硫脲作交联剂、金纳米粒子组装12h抗腐蚀效果最佳,缓蚀率可达99.15％.