کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5426778 | 1395906 | 2006 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Reversible adsorption of Au nanoparticles on SiO2/Si: An in situ ATR-IR study Reversible adsorption of Au nanoparticles on SiO2/Si: An in situ ATR-IR study](/preview/png/5426778.png)
Adsorption and desorption of Au nanoparticles (AuNP) on the (aminopropyl)triethoxysilane (APTES) treated SiO2/Si surface was monitored by in situ attenuated total reflection (ATR) infrared spectroscopy in combination with a liquid flow cell. With increasing the AuNP coverage at the surface, the absorption by water vibration was increased due to surface enhanced infrared absorption (SEIRA). Repulsive electrostatic forces between the incoming AuNP and the already adsorbed AuNP layer lead to saturation at submonolayer coverage of the surface. We clarified that the adsorption process can be described very well by a diffusion limited first-order Langmuir-kinetics model. Furthermore, we show that the AuNPs desorb from the surface when they are exposed to the solution of aminoethanethiol (AET).
Journal: Surface Science - Volume 600, Issue 6, 15 March 2006, Pages L71-L75