Nanocrystalline Au:Ag:SnO2 films prepared by pulsed magnetron sputtering

Abstract

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Silver Nanoparticle-Decorated Tin Oxide Thin Films: Synthesis, Characterization, and Hydrogen Gas Sensing

“…Tauc relation (αE) 2 = A (E − E g ) was used to calculate the optical band gap of these films by plotting the values of (αE) 2 against E and extrapolating the linear portion of the curves, where E and E g are the photon energy of incident light and optical band gap, respectively, A is a constant, and α is the absorption coefficient (Kumar et al, 1999). As can be seen from the extrapolation in Figure 4B, the optical band gap of the both annealed SnO 2 and AgNPs/SnO 2 increased in comparison with the as-deposited SnO 2 sample, and hence, the absorption edge was shifted to shorter wavelength as shown in Figure 4A (Reddy et al, 2013). As an effect of the annealing process, the Ag diffuses into the SnO 2 crystal.…”