AP01022 Synthesis and Sensing Properties of Carbon Quantum Dots/Alq3 Nanocomposite for Hydrogen Sulfide Detection

Abstract

An electrochemical method was used to fabricate carbon quantum dots (CQDs) based gas sensor by combining the CQDs with Tris(8-hydroxyquinoline) aluminum (III) (Alq₃) polymer. A spin-coating method was utilized to apply the CQDs/Alq₃ composite film onto glass substrates. The CQDs/Alq₃ gas sensor exhibited a sensitivity of around 16% at 300°C, the change in resistance was measured, yielding a response time of 11 s and a recovery time of 25 s. The sensor demonstrated a significant reaction to hydrogen sulfide (H₂S) gas. The CQDs gas sensor subjected to H₂S at 300°C exhibited a sensitivity of 28%, with a response time of 20 s and a recovery time of 29 s. The findings indicate that the CQDs/Alq₃ sensor markedly decreased recovery time, emphasizing the role of the Alq₃ polymer in enhancing the gas sensor’s properties.