• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nanotechnology >Wet chemical synthesis of gold nanoparticles using silver seeds: a shape control from nanorods to hollow spherical nanoparticles - art. no. 115608
【24h】

Wet chemical synthesis of gold nanoparticles using silver seeds: a shape control from nanorods to hollow spherical nanoparticles - art. no. 115608

机译：使用银种子湿化学合成金纳米颗粒：从纳米棒到空心球形纳米颗粒的形状控制-艺术。没有。 115608

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A seed-mediated method was employed here for CTAB-assisted gold nanoparticle growth 3-4 nm silver aqueous colloid was stabilized by sodium citrate and used as seed solution to initial gold particle growth. The concentration of seed solution was calculated based on its relationship with silver atom concentration and seed particle statistical mean volume. It was found that there is a maximum seed concentration of 8.57 x 10(-12) M (similar to 25 mu l 0.343 x 10(-8) M seed solution added) in 10 ml 2.5 x 10(-4) M HAuCl4 growth solution for growth of rodlike particles. Below this seed amount, the aspect ratio of nanorods could be controlled by varying the silver seed amount, i.e. nanorods with aspect ratio similar to 18.9 were obtained when the seed concentration in the growth solution was 0.343 x 10(-12) M by adding 1 mu l 0.343 x 10(-8) M silver seed solution and nanorods with aspect ratio similar to 9.69 were obtained when the seed concentration in the growth solution was 1.715 x 10(-12) M by adding similar to 25 mu l 0.343 x 10(-8) M silver seed solution. As the seed concentration in the growth solution was more than 8.58 x 10(-12) M ( 25 mu l 0.343 x 10(-8) M silver seed solution was added), there were no rodlike particles formed but spherical ones instead. These spheres were further studied by TEM and found to all be hollow structures. It was suggested that there were probably two different nucleation processes for growth of nanorods and spheres. For hollow spheres, the reaction between Ag seeds and Au ions formed hollow structures based on the Ag particle template effect. Then further growth of Au on these hollow structures produced hollow gold nanospheres. For nanorods, due to the very low concentration of silver seed ( molar ratio of Ag seed: Au = 3.426 x 10(-8)), the growth process here probably was started by silver-induced Au nucleation, in which reduction of gold ions by silver resulted in small gold clusters. These gold clusters further grew up into nanoparticles and nanorods in the presence of CTAB.
机译：本文采用种子介导的方法进行CTAB辅助金纳米颗粒的生长。3-4 nm的银胶体被柠檬酸钠稳定，并用作初始金颗粒生长的种子溶液。根据种子溶液与银原子浓度和种子颗粒统计平均体积的关系，计算种子溶液的浓度。发现在10 ml 2.5 x 10（-4）M HAuCl4生长中，最大种子浓度为8.57 x 10（-12）M（类似于添加的25μl0.343 x 10（-8）M种子溶液）棒状颗粒生长的解决方案。低于此种子量，可以通过改变银种子的量来控制纳米棒的长宽比，即，当生长溶液中的种子浓度为0.343 x 10（-12）M时，添加1可以得到长宽比与18.9相似的纳米棒。当生长溶液中的种子浓度为1.715 x 10（-12）M时，通过加入25μl0.343 x 10的溶液，可获得0.343 x 10（-8）M的银种子溶液和长宽比接近9.69的纳米棒。 （-8）M银种子溶液。当生长溶液中的种子浓度大于8.58 x 10（-12）M（添加25μl0.343 x 10（-8）M银种子溶液）时，没有形成棒状颗粒，而是球形的颗粒。 TEM对这些球进行了进一步研究，发现它们都是空心结构。有人认为，纳米棒和球的生长可能有两种不同的成核过程。对于空心球，Ag种子与Au离子之间的反应基于Ag颗粒模板效应形成空心结构。然后，金在这些空心结构上的进一步生长产生了空心金纳米球。对于纳米棒，由于银种子的浓度非常低（Ag种子的摩尔比：Au = 3.426 x 10（-8）），此处的生长过程可能是由银诱导的Au成核而开始的，其中金离子的还原白银产生的金簇很小。在CTAB存在下，这些金簇进一步长成纳米颗粒和纳米棒。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号