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不添加任何还原剂,在PVP保护下通过微波辐射[Ag(NH3)2]OH络合物水溶液激发自由电子还原Ag+形成纳米银溶胶。UV-Vis吸收光谱测试表明,胶态纳米银粒子的吸光度随微波辐射时间的延长而增加,但最大吸收波长基本不变。当Ag+/PVP质量比为1:8,微波辐射时间为5min时,吸光度趋于稳定。TEM观测和图像分析结果表明,纳米银粒子的形貌为球形、单分散、平均粒径1.36nm、标准偏差0.54nm。
Without adding any reducing agent, the free electrons are excited by microwave radiation [Ag (NH3) 2] OH complex under the protection of PVP to reduce the Ag + to form a nano-silver sol. UV-Vis absorption spectra showed that the absorbance of colloidal silver nanoparticles increased with the increase of microwave irradiation time, but the maximum absorption wavelength remained unchanged. When Ag + / PVP mass ratio of 1: 8, microwave irradiation time of 5min, the absorbance tends to be stable. The results of TEM and image analysis show that the morphology of the nano-silver particles is spherical and monodispersed with an average particle size of 1.36 nm and a standard deviation of 0.54 nm.