Size-Controlled and Size-Designed Synthesis of Nano/Submicrometer Ag Particles
Size-Controlled and Size-Designed Synthesis of Nano/Submicrometer Ag Particles
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DOI：
10.1021/cg901497p
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发表时间：
2010-08-01
影响因子：
3.8
通讯作者：
Chen, Dairong
中科院分区：
文献类型：
--
作者：
Chen, Bo;Jiao, Xiuling;Chen, Dairong
用抗坏血酸在水溶液和环境条件下还原AgCl，制备了一系列粒径分布均匀的纳米/亚微米银颗粒。NaOH用于调节抗坏血酸的氧化还原电位，聚乙烯吡咯烷酮（PVP）用于平衡银的各种晶体平面生长的相对速率。在该反应条件下，银晶体的成核和生长步骤被分离，从而控制了银晶体的各向异性生长。采用透射电子显微镜（TEM）、高分辨率电子显微镜（HR-TEM）、场发射扫描电子显微镜（FE-SEM）、x射线衍射（XRD）和紫外可见分光光度法对产物进行了研究。在此基础上，建立了合成条件与产物粒度之间的关系式，该关系式可用于定量制备粒径控制和粒径设计的银颗粒。还进行了合成过程的放大，以测试大规模合成银颗粒用于实际工业应用的前景。
A series of nano/submicrometer Ag particles with uniform size-distribution are prepared using ascorbic acid to reduce AgCl in aqueous solution and at ambient conditions. NaOH is used to adjust the redox potential of ascorbic acid, and polyvinylpyrrolidone (PVP) is used to balance the relative rates at which various crystallographic planes of Ag grow. Under the reaction conditions, the nucleation and growth steps are separated, thus controlling the anisotropic growth of the Ag crystals. The products are studied using transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), field emission-scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and UV-vis spectrophotometry. On this basis, an equation for the relationship between the synthesis conditions and the size of the product was established, which can be applied to produce quantitatively size-controlled and size-designed Ag particles. Scale-up of the synthetic procedure is also conducted to test the prospect of large-scale synthesis of Ag particles for practical industrial applications.