银纳米线的侧向生长及其抑制研究

发布时间：2018-01-16 10:39

  本文关键词：银纳米线的侧向生长及其抑制研究　出处：《光谱学与光谱分析》2016年06期 　论文类型：期刊论文

  更多相关文章： 多元醇法 银纳米线 侧向生长 抑制

【摘要】：采用多元醇法,在不同温度,不同PVP滴加速度和加入量的条件下合成了银纳米线。利用XRD,UV-Vis,SEM和TEM对银纳米线及其侧向生长过程进行了观察和分析。UV-Vis表明银纳米线在纵向生长的同时发生了侧向生长。而且表示银纳米线侧向生长的紫外吸收光谱峰在银纳米线合成后期发生了明显的红移,由384nm红移至约388nm处,表明银纳米线合成后期直径迅速增长,银纳米线发生了快速的侧向生长。SEM研究表明银纳米线直径在反应前期(15~23min)只增加了20nm,而在反应后期(23~30min)银纳米线直径增加了近150nm,SEM观察结果与UV-Vis分析结论一致。同时还发现银纳米线直径不仅与晶种大小有关而且与银线外覆盖的银层厚度有关,银源以吸附在银线侧面的小银颗粒为附着点沿其侧面多点沉积导致了银纳米线的侧向生长;降低反应液温度(165℃降至155℃),降低PVP滴加速度(67mL·h~(-1)减小到49mL·h~(-1))以及减少银纳米线合成后期PVP加入量可抑制银纳米线的侧向生长,显著提高银纳米线长径比,银纳米线直径由200nm减小至100nm左右,长度仍保持在100μm以上。
[Abstract]:Silver nanowires were synthesized by polyol method under the conditions of different temperature, different PVP droplet acceleration and addition amount. SEM and TEM have observed and analyzed the silver nanowires and their lateral growth process. UV-Vis shows that the silver nanowires grow at the same time as the longitudinal growth, and indicate that the silver nanowires grow laterally. The UV absorption spectrum peak of silver nanowires showed a red shift in the later stage of synthesis of silver nanowires. The red shift from 384nm to 388nm indicates that the diameter of silver nanowires grows rapidly in the later stage of synthesis. The rapid lateral growth of silver nanowires. SEM showed that the diameter of silver nanowires increased only by 20 nm at 1523 min before the reaction. The diameter of silver nanowires increased by 150 nm at the end of the reaction. The results of SEM are consistent with the results of UV-Vis analysis. It is also found that the diameter of silver nanowires is related not only to the seed size but also to the thickness of silver layer covered by silver wires. Silver source with small silver particles adsorbed on the side of silver wire as the attachment point along its side multi-point deposition led to the lateral growth of silver nanowires. The temperature of the reaction solution was lowered from 165 鈩，

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