物理化学学报 >> 2010, Vol. 26 >> Issue (11): 3095-3100.doi: 10.3866/PKU.WHXB20101132

材料物理化学 上一篇    下一篇

线状和树枝状银纳米结构、形成机理及表面增强拉曼散射性质

吴馨洲1, 裴梅山1, 王庐岩1,2, 李肖男1, 陶绪堂2   

  1. 1. 济南大学化学化工学院, 山东省氟化学化工材料重点实验室, 济南250022;
    2. 山东大学晶体材料国家重点实验室, 济南250100
  • 收稿日期:2010-04-21 修回日期:2010-06-17 发布日期:2010-10-29
  • 通讯作者: 王庐岩, 陶绪堂 E-mail:chm_wangly@ujn.edu.cn, txt@icm.sdu.edu.cn
  • 基金资助:

    国家自然科学基金(50872042, 51003040), 晶体材料国家重点实验室(山东大学)开放课题(KF0802)和山东省博士后创新项目专项资金 (200703075)资助

Synthesis, Formation Mechanism and Surface-Enhanced Raman Scattering Properties of Silver Tangled Nanowires and Dendritic Structures

WU Xin-Zhou1, PEI Mei-Shan1, WANG Lu-Yan1,2, LI Xiao-Nan1, TAO Xu-Tang2   

  1. 1. Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China;
    2. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China
  • Received:2010-04-21 Revised:2010-06-17 Published:2010-10-29
  • Contact: WANG Lu-Yan, TAO Xu-Tang E-mail:chm_wangly@ujn.edu.cn, txt@icm.sdu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50872042, 51003040), Open Research Project (KF0802) from State Key Laboratory of Crystal Material (Shandong University) and the Special Fund Project for Post Doctoral Innovation of Shandong Province, China (200703075).

摘要:

以聚丙烯酰胺(PAM)为模板, 在液相中通过不同浓度的抗坏血酸还原硝酸银能够得到缠结的线状和树枝状银纳米结构. 该方法合成条件温和(常温常压)、产率高、成本低、操作简单, 并且得到了特殊形貌的缠结在一起的线状银纳米结构. 通过透射电子显微镜(TEM), 扫描电子显微镜(SEM)、拉曼光谱和紫外-可见吸收光谱对线状和树枝状银纳米结构的形貌和性质进行了表征. 研究表明, PAM对线形产物的形成起了决定性作用. 在反应初期, 大量新生成的银核被PAM链吸附, 小颗粒逐渐长大, 进而相连, 导致生成了缠结的线状银纳米结构. 另外, 抗坏血酸的浓度越高, 越不利于线状结构的生成. 利用对巯基苯胺(PATP)为探针分子研究了银纳米结构的表面增强拉曼散射(SERS)活性, 结果表明线状银纳米结构具有较强的表面增强拉曼散射效果.

 

关键词: 银, 缠结, 纳米线, 树枝状, 表面增强拉曼散射

Abstract:

Silver tangled nanowires and dendritic structures were readily synthesized in high yield by reducing silver nitrate with different concentrations of ascorbic acid in a polyacrylamide (PAM) aqueous solution at mild conditions (normal temperature and pressure). The structures obtained all have tangled morphology, which is different from the silver nanowires reported previously. The structures of the obtained sliver structures were investigated using transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman spectroscopy, and UV-Vis spectroscopy. PAM plays a key role in the formation of these anisotropic nanostructures as the capping agent and as a soft template. During the initial stage, silver nuclei are formed and PAM molecules simultaneously adsorb on their surfaces. Then, small silver particles will collide with each other along the polymer chains leading to the formation of tangled structures. Additionally, a too high concentration of ascorbic acid is unfavorable for the growth of tangled silver nanowires, and dendritic structures are formed. The surface-enhanced Raman scattering (SERS) activity was investigated using p-aminothiophenol (PATP) as a probe molecule. The silver tangled nanowires and dendritic structures show efficient surface enhanced Raman scattering property.

 

Key words: Silver, Tangled, Nanowire, Dendritic, Surface-enhanced Raman scattering

MSC2000: 

  • O641