Figure 2
(a) UV–Vis absorption spectra of the solutions containing Pt and Co precursors with and without PNIPAM. The inset is the enlarged spectra in the wavelength region between 400 and 800 nm. (b) C K-edge NEXAFS spectra of bare carbon, PtCo/C, C-PNIPAM and PtCo/C-PNIPAM. (c) N 1s core-level XPS spectra and deconvoluted curves of C-PNIPAM (top) and PtCo/C-PNIPAM (bottom). In the deconvoluted XPS curves, blue, red and green lines indicate the amide N, Co–N and background peaks, respectively. (d) N K-edge NEXAFS spectra of C-PNIPAM and PtCo/C-PNIPAM. In the case of the N K-edge NEXAFS spectrum of PtCo/C-PNIPAM, the Co L2 second harmonic is due to the existence of Co in the sample. NEXAFS, near-edge X-ray absorption fine structure; UV–Vis, ultraviolet–visible, XPS, X-ray photoelectron spectroscopy.
