快速制备胶态银纳米粒子

通过紫外光与热激发协同作用于Ag(NH3)2]+络合离子与聚乙烯吡咯烷酮水溶液，制备高浓度、粒径分布均匀的胶态银纳米粒子，并用紫外-可见吸收光谱对银纳米粒子的形核与增长过程进行监控。结果表明：所制得银纳米粒子的等离子共振吸收峰对应的波长大约为419 nm。TEM结果显示，大多数银纳米粒子为球形，其平均粒径约为1.32 nm，标准偏差只有0.53 nm。所得产物的pH值几乎是中性，这使得该银胶有着更广泛的应用。

A Facile Method to Prepare Quickly Colloidal Silver Nanoparticles

A high-concentration silver colloidal nanoparticles with a narrow size distribution were obtained using Ag(NH3)2]+-PVP(poly (N-vinyl-2-pyrrolidone)) solution via the synergistic action of UV and heat excitation. The nucleation and growth of the silver nanoparticles were monitored by UV-vis. absorption spectroscopy. The results show surface plasma resonance peaks of silver nanoparticles are located at about 419 nm. Transmission electron microscopy (TEM) reveals that most of the particles possess spherical shape with an average size of about 1.32 nm and standard deviation 0.53 nm. Moreover, the pH value of the obtained samples is nearly neutral, which will lead to a more extensive application.