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以不同平均分子质量的聚乙烯吡咯烷酮(PVP,通常用K值来表示PVP溶液相对粘度的特征值,粘度越大,PVP平均分子质量越大,平均分子质量为8000、40000、160000、360000的PVP分别标记为K17、K30、K60、K90)为表面活性剂,通过水热法合成了形貌和光学共振峰可控的银纳米结构.将反应体系加入到60 mL的不锈钢高压反应釜中,在一定的温度下加热数小时.我们在K17的水溶液中合成了尺寸均一的五重孪晶银纳米十面体.而在K30、K60和K90的乙二醇(EG)溶液中得到了纵横比随着PVP分子质量增大而增大的银纳米线.产物的形貌和微结构通过透射电镜(TEM)和场发射扫描电镜(FE-SEM)进行表征,表面等离子共振(SPR)吸收峰通过紫外-可见分光光度计进行测试,结果显示银纳米结构的表面等离子共振随着其形貌和尺寸的改变而发生变化.
With different average molecular weight of polyvinylpyrrolidone (PVP, K value is usually used to represent the characteristic value of the relative viscosity of PVP solution, the greater the viscosity, the greater the average molecular weight of PVP, the average molecular weight of 8000, 40000, 160000, 360000 PVP Respectively, labeled as K17, K30, K60, K90) as a surfactant, hydrothermal method was synthesized morphology and optical formable silver nanostructures for formant.Will the reaction system was added to 60 mL of stainless steel autoclave, at Heated for a few hours at a certain temperature.We synthesized five-fold twin silver nanoscahedron with uniform size in K17 aqueous solution.While the aspect ratio of K30, K60 and K90 in ethylene glycol (EG) The morphology and microstructure of the product were characterized by transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM). The surface plasmon resonance (SPR) absorption peaks were observed by UV- Visible spectrophotometer test showed that the surface plasmon resonance of silver nanostructures changes with the changes in morphology and size.