491051.fig.005a
(a)
491051.fig.005b
(b)
491051.fig.005c
(c)
Figure 5: DSC curves of undoped VO2 and 2 atom% W-doped VO2 nanopowders during the heating and cooling cycles (a). The curves of as-obtained samples ( V 1 𝑥 W 𝑥 O2, x = 0–0.03, at intervals of 0.005) upon heating process (b). Effect of tungsten-doped vanadium dioxide concentration on the phase transition temperature upon heating process (c).