Fig. 2

a XPS survey spectra of Ni₆/AB composites (red line) and Ni₆(SC₁₂H₂₅)₁₂ (black line). b The Ni 2p deconvulted XPS spectrum of Ni₆/AB composites (bottom one) and Ni₆(SC₁₂H₂₅)₁₂ (upper one). c The S 2p deconvulted XPS spectrum of Ni₆/AB composites (bottom one, black line), and Ni₆(SC₁₂H₂₅)₁₂ (upper one, red line). d The FTIR spectra of Ni₆/AB composites(red line) and Ni₆(SC₁₂H₂₅)₁₂ (black line). The inset in Fig. 2d is the amplifying region around 390 cm⁻¹