Attachment of gold nanoparticles onto indium tin oxide surfaces controlled by adding citrate ions in a seed-mediated growth method
Attachment of gold nanoparticles onto indium tin oxide surfaces controlled by adding citrate ions in a seed-mediated growth method
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DOI：
10.1016/j.apsusc.2006.06.038
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发表时间：
2006-12
影响因子：
6.7
通讯作者：
A. Umar;M. Oyama
中科院分区：
文献类型：
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作者：
A. Umar;M. Oyama
报道了一种控制金纳米颗粒 (AuNP) 在氧化铟锡 (ITO) 表面上附着的简单方法。在种子介导的生长方法中，将用于接种过程的金胶体溶液中柠檬酸三钠的浓度从 1 调整到 50 mM，观察到 SEM 图像和实际颜色的巨大变化，表明 ITO 表面上形成的 AuNP 纳米结构的变化。当在种子溶液中添加 25mM 柠檬酸根离子时，观察到较小的具有较高密度的 AuNP 的附着，而观察到较大的 AuNP 在 50mM 时附着。根据这种差异和播种后观察到的表面 SEM 图像，讨论了柠檬酸根离子的作用。因此，推断柠檬酸根离子影响生长过程以及播种过程。柠檬酸根离子增加的负电荷所预期的排斥力并不显着，而是作为柠檬酸根离子的特殊效果而促进了致密的附着。这种对 ITO 上 AuNP 附着的控制实际上是有效的，因为仅通过改变种子溶液的成分即可实现致密附着。
A simple approach to control the attachment of gold nanoparticles (AuNPs) onto the indium tin oxide (ITO) surfaces is reported. Adjusting the concentration of trisodium citrate in the Au colloid solution for the seeding process from 1 to 50mM in the seed-mediated growth method, the dramatic changes in the SEM images and actual color were observed indicating the changes in nanostructures of AuNPs formed on the ITO surfaces. Whereas the attachment of smaller AuNPs with higher density were observed when 25mM citrate ions were added in the seed solution, larger AuNPs were observed to attach at 50mM. On the basis of this difference and the surface SEM images observed just after seeding, the roles of citrate ions were discussed. Consequently, it was inferred that the citrate ions affected the growth process as well as the seeding process. The repulsive power expected from the increased negative charges of citrate ions were not significant, but rather the dense attachment was promoted as the peculiar effect of citrate ions. Such control of the AuNPs attachment on ITO would be practically effective because the dense attachment can be performed by just changing the composition of the seed solution.