纳米银粒子的化学法制备及其表征

采用化学还原法制备纳米银粒子,制备过程先后使用两种保护剂,用聚乙烯吡咯烷酮(PVP)作保护剂、N,N-二甲基甲酰胺(DMF)作还原剂,还原硝酸银溶液得到纳米银粒子.该体系的还原主要通过煮沸法进行;以聚乙二醇(PEG)作为保护剂、还原剂、稳定剂和反应介质,还原硝酸银溶液得到纳米银粒子,并且对所制备的纳米银粒子分别用紫外光谱、荧光光谱、X-射线衍射、做了详细地表征.     

Spectrophotometric detection of diethylstilbestrol on the basis of the plasmon resonance absorption of silver nanoparticles

In this study, a spectrophotometric detection method for diethylstilbestrol (DES) was proposed by reducing silver nitrate (AgNO3) to obtain silver nanoparticles (AgNPs) in the medium of ammonia and sodium hydroxide. It was found that the resulting AgNPs have plasmon resonance absorption (PRA) characteristic at 415 nm, and the PRA is proportional to the increase of DES concentration in the range of 4.0×10-8-1.0×10-5M with the detection limit (3σ) of 1.2×10-7M. Most of the coexisting substances at high concentrations did not affect the detection of real samples, such as tablets. The recovery was in the range of 96.01%-107.41% and the RSD was lower than 4.7%. This method can be successfully applied to control preparation quality of DES.