Abstract
Herein, a novel approach of ion beam irradiation (nitrogen beam dose ∼ 1013 ions/cm2, 40 keV for 30 min in ultra-high vacuum conditions) is explored for the preparation of nanocrystalline anatase TiO2 modified with nitrogen (N) and silver (Ag). The prepared materials characterized using XRD, Raman, UV–Visible spectroscopy, EIS and wettability techniques. The structural-optical studies revealed the interstitial and/or substitutional doping of N in O-Ti-O matrix supported by Williamson-Hall lattice strain values and dispersion of Ago particles at the TiO2 surface. Raman spectra confirmed the crystallization of anatase TiO2 wherein red shifting-broadening of Raman active modes are due to the phonon confinement and structural defects due to favored substitutional N3– doping in TiO2 lattice. The higher values of Z′, Z″, and RCT in Nyquist plots and the blue shift of ωmax in Bode plots for irradiated films further supported the substitutional doping of N rather than the interstitial one.
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