XPS Si 2p spectra of the functionalized nanoparticles. The central silicon peak is a superposition of the Si 2p1/2 and the Si 2p3/2 signals. The energy range in which the silicon oxide peak is expected to show is implied.
Bywalez et al. Nanoscale Research Letters 2012 7:76 doi:10.1186/1556-276X-7-76