半胱氨酸亚金铵的合成、理化性质及电镀金应用  

Synthesis, properties of NH_4Au(Cys)_2 and its application in electroplating gold

作　　者：黄世玉[1] 李德良[1] JA Finch 盛国军[1] 李乐 

机构地区：[1]中南林业科技大学环境科学与工程学院,湖南长沙410004 [2]McGill University, 3610University St. [3]长沙铂鲨环保设备有限公司,湖南长沙410007

出　　处：《中南大学学报（自然科学版）》2015年第4期1197-1201,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(20976201);湖南省自然科学基金资助项目(07JJ6156)~~

摘　　要：以半胱氨酸为配体合成一种新型亚金配合物NH4Au（Cys）2,对该配合物进行元素分析、红外光谱、紫外光谱、热失重分析和导电性测量等理化性质研究;以该亚金配合物为金源开展相关的电镀金工艺探索,并通过四因素三水平的正交试验获得其最佳条件参数;采用扫描电子显微镜（SEM）和X线衍射（XRD）对镀金层的表面质量进行探讨。研究结果表明：该目标产物的分子式为NH4Au（Cys）2·2H2O,该配合物中以半胱氨酸的巯基和金配位为成健特征,在170℃以下热稳定性较好,该亚金配合物是一个典型的离子化合物。在电流密度为200-300 A/m^2,p H为10.5-12.0,温度为35-45℃,金质量浓度为15-25 g/L的电镀工艺条件下,得到粒度为0.5-1.0μm的单质金,且主要沿着（111）面进行生长。Aurous-cysteine complex was synthesized, and related characterization including elemental analysis（EA）,infrared spectroscopy（IR）, ultraviolet（UV）, thermogravimetric analysis（TGA） and conductivity were studied. The optimal electro-plating indexes were obtained by the Orthogonal test method. The micro-morphology of gold particles were investigated by SEM and XRD. The results show that the target product is NH4Au（Cys）2·2H2O, UV and IR spectra reveals a strong coordinating bond form between Au（I） and the mercapta group of the cysteine. TGA curve explains that the product is thermally stable below 170 ℃. Conductivity data shows that it is a typical ionic compound. The electroplated gold particles are obtained by operating temperature 35-45 ℃, current density 200-300 A/m^2,p H=10.5-12.0, gold mass concentration 15-25 g/L, respectively. They are pure Au0 and in an even size of 0.5-1.0 μm,and grow along（111） plane predominantly.

关 键 词：半胱氨酸亚金铵 合成 性质 电镀金 形貌 

分 类 号：TQ153.1[化学工程—电化学工业]