XPS C 1s spectra of acrylic acid-functionalized nanoparticles. The maximum of the C-C peak is lying at 287.1 eV, and the Si-C peak is centered at 285.4 eV, displaying a shift of 1.7 eV. The peak attributed to the carboxyl group is located at 291 eV.
Bywalez et al. Nanoscale Research Letters 2012 7:76 doi:10.1186/1556-276X-7-76