“…5(a)e(d) shows the N 1s spectra that are fitted by four components, i.e. ZreOeN, SieN, CeN, and/or ZreN, with binding energies of 399.2 eV [38,39,41], 397.0e397.1 eV [9,23,45], 396.5 eV [46], and 395.9 eV [9,29], respectively. The intensity of these peaks decreases with the increasing of etching time, until it is totally faded away.…”