金（核）/二氧化硅（壳）纳米颗粒的X射线光电子能谱表征

XPS characterization of Au (Core)/SiO2 (shell) nanoparticles.

作者信息

Tunc Ilknur, Suzer Sefik, Correa-Duarte Miguel A, Liz-Marzán Luis M

出版信息

J Phys Chem B. 2005 Apr 28;109(16):7597-600. doi: 10.1021/jp050767j.

Abstract

Core-shell nanoparticles with ca. 15-nm gold core and 6-nm silica shell were prepared and characterized by XPS. The Au/Si atomic ratio determined by XPS is independent of the electron takeoff angle because of the concentric spherical shape of the nanoparticles. The formula given by Wertheim and DiCenzo (Phys. Rev. B 1988, 37, 844) for spherical nanoparticles and the modified one by Yang et. al. (J. Appl. Phys. 2005, 97, 024303) for core-shell nanoparticles are used to correlate the XPS-derived composition with the geometry of the nanoparticles only after significantly modifying either the bulk density of the silica shell or the attenuation length of the photoelectrons.

摘要

制备了具有约15纳米金核和6纳米二氧化硅壳的核壳纳米颗粒，并通过X射线光电子能谱（XPS）对其进行了表征。由于纳米颗粒的同心球形形状，由XPS测定的金/硅原子比与电子出射角无关。仅在对二氧化硅壳的体密度或光电子的衰减长度进行显著修正之后，才使用Wertheim和DiCenzo（《物理评论B》1988年，第37卷，第844页）给出的用于球形纳米颗粒的公式以及Yang等人（《应用物理杂志》2005年，第97卷，024303）给出的用于核壳纳米颗粒的修正公式，将XPS得出的组成与纳米颗粒的几何形状关联起来。