分别采用柠檬酸三钠和硼氢化钠为还原剂在水相中还原氯金酸制备了稳定的金纳米溶胶。通过透射电子显微镜、激光粒度分析仪、紫外-可见分光光度计对所制备的金纳米颗粒的形貌、结构、粒度分布以及光学特性进行表征,研究了还原剂用量、加热反应时间、反应温度、pH值对水相制备金纳米颗粒的影响。结果表明通过调节合成工艺,可以实现金纳米颗粒的可控生长,制备出平均粒径在5～70nm粒度分布均匀的球形金纳米颗粒。
Respectively using citric acid three sodium and sodium borohydride as the reducing agent,we prepared stable gold colloid by reducing chloroauric acid in aqueous phase.Transmission electron microscope,dynamic light scattering,UV-Vis spectrophotometer were used to characterize the size,shape,structure,size distribution and optical properties of the prepared Au nanoparticles.The influence of reductant amounts,reacting time,reaction temperature,pH value of the precursor on the concentration,size,shape and monodispersity of Au colloid were investigated.It＇s found that we can control the synthesis of Au nanoparticles by adjusting the synthesis technics.Spherical Au nanoparticles with the average size of 5-70nm can be prepared in this method.
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