Figure 5
XPS on metal oxide ENPs. Al 2p, Sn 4d, Cu 3p and Zn 3p photoelectron spectra have been measured for agglomerates generated from different electrodes. The blue dots show the raw data and the black lines are the sum of the fitted individual peaks (shaded profiles). In all four cases, metal oxide is formed on the surface of the agglomerates. (a), (b) Al and Sn were generated in a carrier gas composed of N2 with 5% H2. (c), (d) Cu and Zn ENPs were generated in N2. |