Figure 3.

Steady state transmission measurements carried out on SnO2NWs using a UV-IR spectrometer. The upper corner inset shows a plot of the square of the absorption versus incident photon energy, providing us with an estimate of the bandgap energy 3.77 eV. There are two broad absorption bands below the bandgap referred to as D.T.S—deep trap states and S.T.S.—shallow trap states

Othonos et al. Nanoscale Research Letters 2009 4:828-833   doi:10.1007/s11671-009-9323-9