Time-Resolved Small-Angle X-ray Scattering Study on the Growth Behavior of Silver Nanoparticles
Time-Resolved Small-Angle X-ray Scattering Study on the Growth Behavior of Silver Nanoparticles
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DOI：
10.1021/jp502482c
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发表时间：
2014-05
影响因子：
3.7
通讯作者：
Shi Yan;Zhonghua Wu;Hongying Yu;Yu Gong;Yuanyuan Tan;R. Du;Wen Chen;Xue-qing Xing;G. Mo;Zhongjun Chen;Q. Cai;Dong-bai Sun
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文献类型：
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作者：
Shi Yan;Zhonghua Wu;Hongying Yu;Yu Gong;Yuanyuan Tan;R. Du;Wen Chen;Xue-qing Xing;G. Mo;Zhongjun Chen;Q. Cai;Dong-bai Sun
以聚乙烯吡咯烷酮（PVP）为稳定剂，采用化学还原法制备了银纳米粒子。在银纳米粒子的合成过程中，硝酸银水溶液被用作前体，硼氢化钠被用作还原剂。制备四种Ag-纳米颗粒悬浮液，其中在相应的前体中的初始Ag+浓度为2、4、6和8 mM。采用时间分辨小角X射线散射（SAXS）技术对银纳米粒子的成核和生长过程进行了原位监测。通过逐切线法分析SAXS数据，获得了粒度随时间的变化。小角X射线散射结果表明，银纳米颗粒的生长表现为线性关系的初始生长阶段（<1 s），这是用来评估的临界粒径。银纳米粒子的生长在整个形成过程中经历了一个快速生长阶段和一个缓慢生长阶段。提出了扩散-聚结模型。
Silver nanoparticles were prepared with a chemical reduction method in the presence of polyvinylpyrrolidone (PVP) used as a stabilizing agent. During the synthesis of Ag nanoparticles, aqueous silver nitrate solutions were used as the precursors and sodium borohydride was used as the reducing agent. Four Ag-nanoparticle suspensions were prepared with the initial Ag+ concentrations of 2, 4, 6, and 8 mM in the corresponding precursors. The in-situ time-resolved small-angle X-ray-scattering (SAXS) technique was used to monitor the nucleation and growth processes of Ag nanoparticles. The particle-size change with time was obtained by analyzing the SAXS data with a tangent-by-tangent method. The SAXS results demonstrate that the Ag nanoparticle growth behaves as a linear relation in the initial growth stage (<1 s), which was used to evaluate the critical particle size. The growth of Ag nanoparticles experienced a fast stage and then a slow stage in their whole formation process. A diffusion–coalescence model h...