首页> 外文期刊>RSC Advances >Morphological changes of gold nanoparticles due to adsorption onto silicon substrate and oxygen plasma treatment
【24h】

Morphological changes of gold nanoparticles due to adsorption onto silicon substrate and oxygen plasma treatment

机译:由于吸附到硅衬底上的金纳米粒子的形态学变化及氧等离子体处理

获取原文
           

摘要

Deposition of gold nanoparticles (AuNPs) on a solid substrate followed by oxygen plasma treatment is a commonly used protocol for surface functionalization. Surprisingly, the effect of the deposition process and oxygen plasma on the morphology of the AuNPs is usually overlooked in research. Here, we investigated morphological changes caused by (i) adsorption of small ligand-capped AuNPs (~5 nm in diameter) onto a silicon substrate and (ii) subsequent oxygen plasma treatment. AuNPs coated with positively and negatively charged as well as uncharged ligands have been investigated. It is found that upon the adsorption the AuNPs undergo plastic deformations and their shapes can be approximated by spherical caps. The degree of the deformation depends strongly on the AuNP coating. During the plasma treatment the AuNPs behave like droplets of a non-wetting liquid, exhibiting the ability to move and merge. We argue that the AuNP coarsening is dominated by the diffusion coalescence mechanism and show that time evolution of the surface AuNP density follows the Smoluchowski coagulation equation. The diffusivity of the AuNP scales with its mass as D ( m ) ~ m ~(? α ) with α = 2.6.
机译:在固体基材上沉积金纳米颗粒(AUNP),然后进行氧等离子体处理是用于表面官能化的常用方案。令人惊讶的是,沉积过程和氧等离子体对剖腹产形态的影响通常被忽视。在此,我们研究了(i)将小型配体覆盖的剖腹产(直径〜5nm的〜5nm)吸附到硅衬底上和(ii)随后的氧等离子体处理中引起的形态学变化。已经研究了涂有正极和带负电的AUNPS以及没有充电的配体。发现吸附在吸附后,剖腹塑性变形,它们的形状可以用球形帽近似。变形的程度在AUNP涂层上强烈取决于。在等离子体处理期间,AUNP表现得像非润湿液体的液滴,表现出移动和合并的能力。我们认为AUNP粗化由扩散聚结机构主导,并表明表面AUNP密度的时间演变遵循Smoluchowski凝固方程。具有α= 2.6的αUunp尺度的扩散性,其质量为d(m)〜m〜(α)。

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