Imidazole-based ionogel as room temperature benzene and formaldehyde sensor.

A room temperature benzene and formaldehyde gas sensor system with an ionogel as sensing material is presented. The sensing layer is fabricated employing poly(N-isopropylacrylamide) polymerized in the presence of 1-ethyl-3-methylimidazolium ethyl sulfate ionic liquid onto gold interdigitated electrodes. When the ionogel is exposed to increasing formaldehyde concentrations employing N as a carrier gas, a more stable response is observed in comparison to the bare ionic liquid, but no difference in sensitivity occurs.