Figure 4

Energy spectra.
The copper ion energy spectra (a,b) from 7 nm and 15 nm particle coated targets respectively measured using the TPS images. Inset shows the SEM images of the corresponding targets.
Energy spectra.
The copper ion energy spectra (a,b) from 7 nm and 15 nm particle coated targets respectively measured using the TPS images. Inset shows the SEM images of the corresponding targets.