Fig. 3: Spectroscopic signature of coordination of the peptidic polymer to the nanoparticle surface.
From: Bidimensional lamellar assembly by coordination of peptidic homopolymers to platinum nanoparticles
a XPS spectrum at the N1s edge of PBLG4 alone. XPS spectra at the N1s edge of assemblies between platinum nanoparticles and PBLG4 at: b 1 eq. (12% of component at 398 eV); c 0.5 eq. (33% of component at 398 eV); d 0.05 eq. (45% of component at 398 eV). e Infrared spectra of CO coordinated at the nanoparticle surface and of peptide bond of the polymer within the assemblies (at 0 eq., 0.05 eq., 0.5 eq., and 1 eq.). The spectra are normalized to the signal of the CO vibration around 2040 cm−1. f Zoom on the infrared spectra of Fig. 2e at the terminal CO region. The assembly process is characterized by a specific signature both in XPS and infrared spectroscopies.
