在室温下,用紫外光辐照N-乙烯基吡咯烷酮(NVP)和硝酸银(AgNO_3)水溶液,双原位一步合成了纳米银/聚乙烯吡咯(PVP)复合物.透射电镜(TEM)分析表明,纳米银/PVP复合物分散性好、粒径在5 nm左右;X射线光电子能谱(XPS)表明,C=O中C_(ls)结合能(285.61 eV)比标准C=O中C_(ls)结合能(287.79 eV)降低了2.18 eV,N_(ls)的结合能比标准的能谱峰位(399.88 eV)降低了0.38 eV;红外光谱(FT-IR)表明,纳米Ag/PVP羰基吸收峰,峰位从1673cm~(-1)变化到1661 cm~(-1),发生红移;XPS和FT-IR分析表明,纳米银不仅和羰基氧有相互作用,而且通过p-π共轭效应,与氮和羰基碳也发生了相互作用.
Nano-silver/polyvinylpyrrolidone(PVP)composite materials were prepared with the silver nitrate solution containing N-vinyl pyrrolidone(NVP) at the room temperature, in which Ag~+ ions were reduced to nano silver particles, and the monomers were polymerizated simultaneously by ultraviolet irradiation.Transmission electron microscopy showed that nano silver particles are homogeneously dispersed, and the size of spheral particles was about 5 nm.The result of infrared spectrum suggested that the characteristic peaks of the stretching vibration absorption peak of carbonyl at 1661 cm~(-1) in the nano-Ag/PVP composite is shifted 12 cm~(-1).X-ray photoelectron spectroscopy proved that the C_(ls) binding energy(285.61 eV) of C=O and the N_(ls) binding energy(399.5 eV) reduces 2.18 eV and 0.38 eV respectively.It is concluded that there is an interaction between nano silver and carbonyl oxygen and that nano silver interacts with nitrogen and carbonyl carbon through p-π conjugation effect in nano-silver/PVP.
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