Figure 3

PL spectra of pristine and treated Si NWA samples. PL spectra of treated Si NWA samples prepared with H₂O₂ concentrations of (a) 0.5, (b) 2, and (c) 5 M at room temperature. The symbol ‘*’ denotes the multiplying factor relative to their original PL. (d) Temperature-dependent PL spectrum of oxidized Si NWAs obtained at 5 M H₂O₂ concentration.