CO gas sensor based on a conducting dendrimer

This paper presents the results of the gas-sensing performance of a siloxan e-based dendrimer gas sensor. We have synthesized a suitable dendrimer for sensing CO gas, and fabricated a device by spin-coating the dendrimer. For the source and drain contact, we deposited Au by thermal evaporation. The s ensor linearly responded to the various concentrations of CO gas. The highe r CO gas concentration became, the higher the current was produced. The cur rent was proportional to the CO concentrations, although it tends to gradua lly saturate above 40% of concentration. For the transient characteristics, it took about 250 s to reach 90% of the steady-state value when CO gas tur ns on. The recovery time to the baseline was about 420 s after the gas turn s off. The current conduction mechanism of the dendrimer-based sensor was f ound to be determined by interference of CO gas between the surface functio nal groups of dendrimer. (C) 2001 Elsevier Science B.V. All rights reserved .