Figure 8.

(a) Image of MoS₂ semi-transparent film on the 2” sapphire substrate; (b) Cross-sectional Transmission Electron Microscopy (TEM) images, demonstrating that the synthesized MoS₂ films consisted of three layers of MoS₂; (c) Transient NO₂ gas response at 1.5 to 50 ppm concentration, at operating temperatures of RT and 100 °C. The recovery rate was faster at 100 °C than at RT; (d) Comparison of responses to NO₂ and NH₃. Reprinted with permission from [58]. Copyright (2015) Nature Publishing Group: London, UK.