Fig. 2

XPS spectra of modified silicon samples. a High-resolution narrow scans of C 1s and b P 2s obtained from 5-hexenyl acetate monolayers on silicon (surface 2 in Fig. 1). c C 1s spectrum of hydroxyl-terminated surface 3. d High-resolution scans of C 1s and e P 2s from phosphorus-modified silicon sample (surface 4)