PVP表面修饰Ag纳米粒子制备及动力学研究  

Study on preparation and kinetic behavior of Ag nanoparticles stabilized by PVP

作　　者：孙丽 陈延明[1] SUN Li;CHEN Yan-ming(School of Petrochemical Engineering,Shenyang University of Technology,Liaoyang 111003,China)

机构地区：[1]沈阳工业大学石油化工学院,辽宁辽阳111003

出　　处：《应用化工》2019年第S02期221-225,共5页Applied Chemical Industry

摘　　要：以PVP(聚乙烯吡咯烷酮)为大分子表面活性剂,AgNO_(3)为前驱体,乙醇-水为溶剂,通过乙醇的还原作用和PVP的弱还原作用,在乙醇-水体系中制备得到了Ag纳米粒子。实验过程中,系统考察了水/乙醇体积比、反应温度、反应时间、PVP浓度、AgNO_(3)浓度等因素对Ag纳米粒子生成过程动力学的影响。通过紫外-可见吸收光谱(UV-Vis)和透射电子显微镜(TEM)对所合成的Ag纳米粒子生长的动力学过程和形貌进行了表征。UV-Vis测试结果表明,随着乙醇-水混合溶剂中水含量的增加,Ag纳米粒子的吸光度明显减小;随着反应温度、PVP浓度、AgNO_(3)浓度和反应时间的增加,Ag纳米粒子的吸光度均有所增加,其中PVP和AgNO_(3)浓度对反应过程的影响更为显著。TEM测试结果表明,所得到的Ag纳米粒子具有球状结构,且具有较窄的尺寸分布。Ag nanoparticles were obtained by using polyvinylpyrrolidone(PVP)as macromolecular surfactant,AgNO_(3)as precursor,ethanol-water as mixer solvent through the reduction of ethanol and weak reduction of PVP.The effects of kinetic process for the formation of Ag nanoparticles were studied by changing volume ratio of water and ethanol,reaction temperatures,reaction times,PVP and AgNO_(3)concentrations.The kinetic process for the formation of Ag nanoparticles and Ag nanoparticles morphology were determined by UV-Vis absorption spectrum and transmission electron microscopy(TEM).UV-Vis results show that the absorption strength of Ag nanoparticles decreases apparently as the increase of the volume ratio of water and ethanol,meanwhile,the absorption strength of Ag nanoparticles increases as the in increase of reaction time,reaction temperatures,PVP and AgNO_(3)concentrations.The influence of PVP and AgNO_(3)concentration is much stronger.TEM result shows that the obtained Ag nanoparticles with spherical morphology has a narrow size distributions.

关 键 词：银 纳米粒子 PVP 动力学过程 

分 类 号：TB383[一般工业技术—材料科学与工程]