(a) Optical signals obtained using the same sensing film cyclically exposed to acetone along 10 days. The sensing films were composed of [BMIM] [DCA], 5CB, BSG, and Milli-Q water (Hussain et al., 2017). (b) Electrical signals obtained using the same sensing film for different VOCs exposure. The electrical films were composed of [BMIM] [DCA], 5CB, BSG, Sorbitol, and Milli-Q water (Hussain et al., 2017).