物理化学学报 >> 2014, Vol. 30 >> Issue (3): 569-575.doi: 10.3866/PKU.WHXB201312253

材料物理化学 上一篇    下一篇

聚乙烯吡咯烷酮辅助的水热法合成形貌可控的银纳米结构

徐丽红1, 阚彩侠1,2, 王长顺1, 从博1, 倪媛1, 施大宁1   

  1. 1 南京航空航天大学理学院应用物理系, 南京 211106;
    2 南京航空航天大学, 纳智能材料器件教育部重点实验室, 南京 211106
  • 收稿日期:2013-10-28 修回日期:2013-12-23 发布日期:2014-02-27
  • 通讯作者: 阚彩侠, 施大宁 E-mail:cxkan@nuaa.edu.cn;shi@nuaa.edu.cn
  • 基金资助:

    国家自然科学基金(11274173,51032002,61222403,11374159)及中央高校基本科研业务费专项资金(NZ2013304)资助项目

Synthesis of Ag Nanostructures with Controlled Shapes by a Polyvinylpyrrolidone-Assisted Hydrothermal Method

XU Li-Hong1, KAN Cai-Xia1,2, WANG Chang-Shun1, CONG Bo1, NI Yuan1, SHI Da-Ning1   

  1. 1 Department of Applied Physics, College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, P. R. China;
    2 Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, P. R. China
  • Received:2013-10-28 Revised:2013-12-23 Published:2014-02-27
  • Contact: KAN Cai-Xia, SHI Da-Ning E-mail:cxkan@nuaa.edu.cn;shi@nuaa.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (11274173, 51032002, 61222403, 11374159) and Fundamental Research Funds for the Central Universities, China (NZ2013304).

摘要:

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.

关键词: 银纳米线, 五重孪晶, 十面体, 聚乙烯吡咯烷酮, 生长机制

Abstract:

Ag nanostructures with well-defined shapes and optical resonances have been masssynthesized by a hydrothermal method. Polyvinylpyrrolidone (PVP) polymers with average molecular weights (MW) of 8000, 40000, 160000, and 360000 denoted as K17, K30, K60, and K90, respectively, were chosen as surfactants (K is usually used to represent the characteristic value of relative viscosity of the PVP solution). It was found that the larger MW of PVP, the higher relative viscosity of the PVP solution. All of the reactants were transferred into a 60 mL stainless steel autoclave and heated at a certain temperature for hours. Five-fold twinned Ag nanodecahedrons with nearly uniform size were synthesized in the aqueous solution of K17. Ag nanowires were obtained with the presence of K30, K60, and K90 in ethylene glycol (EG) solution, and the aspect ratios of the Ag nanowires increased with increasing the MW of PVP. The morphology and microstructures of the obtained products were characterized by transmission electron microscopy (TEM) and field emission-scanning electron microscopy (FE-SEM). The surface plasmon resonance (SPR) spectra of the Ag nanostructures were measured using an UV-Vis spectrophotometer. The results showed that the surface plasma resonance of the Ag nanostructures was dependent on their shape and size.

Key words: Ag nanowire, Five-fold twinned crystal, Decahedron, Polyvinylpyrrolidone, Growth mechanism

MSC2000: 

  • O649