Figure 5
From: Synthesis and thermochromic property studies on W doped VO2 films fabricated by sol-gel method

The infrared transmittance curves of the 1.5%W doped samples in the (a) heating and (b) cooling in the range of 1000–4000 cm−1. Hysteresis loops for the temperature dependent transmittance of (d) Undoped; (d) nominal 1 at.% W doped; (e) nominal 1.5 at.% W doped; (f) nominal 2 at.% W-doped VO2 films annealed at 470 and 500 °C.