High sensitivity of isopropyl alcohol gas sensor based on memristor device operated at room temperature

In this paper, we present the high sensitivity of an isopropyl alcohol gas sensor, which is based on a memristor device that is operated at room temperature. We proposed the SnO2-based memristor to detect isopropyl alcohol and demonstrated the change in the current of the SnO2-based memristor that is monitored in real time depending on concentration of the isopropyl alcohol gas at room temperature. As a result, the current of the SnO2-based memristor is drastically decreased as we introduced isopropyl alcohol into the memristor based gas sensor. A change in current, which depends on the concentration of the isopropyl alcohol gas, was evaluated as the sensitivity and the sensitivity was 2.02 for 30 ppm isopropyl alcohol gas. In addition, in the proposed SnO2-based memristor, we observed an immediate response of < 4 s when exposed to isopropyl alcohol as well as an immediate recovery of < 6 s when flowing of the injected gas was stopped.