Indium-doped CuSnO3 perovskite hybrids for chemiresistive CO sensing

The In–doped CuSnO 3 with a perovskite framework was facilely synthesized. • The Cu 1-x In x SnO 3 sensor show high response of R a /R g  = 8.5 to 100 ppm CO at 250 °C. • The LOD of the CuSnO 3 with vs without In-doping is 16.1 ppb vs 30.1 ppb. • The sensitivity enhanced ∼2 times, and the response/recovery time significantly reduced. Metal oxide semiconductor (MOS) gas sensors for carbon monoxide (CO) detection still face challenges including slow research progress, insufficient stability, and unsatisfactory sensitivity. To address these issues, In-doped perovskite-type CuSnO 3 (Cu 1-x In x SnO 3 ) hybrids were synthesized via a one-step co-precipitation method and firstly used for CO detection in this work. The multi-level characterization analysis has confirmed the uniform elemental distribution of In, Cu, Sn, and O in Cu 1-x In x SnO 3 nanostructures (nanospheres and nanorods) with a well-defined perovskite framework. Gas-sensing evaluation revealed that the n-type Cu 1-x In x SnO 3 sensor exhibits excellent CO detection capability at 250 °C, demonstrating a high response (S = 8.5 to 100 ppm), outstanding linearity across various concentration ranges, fast response/recovery kinetics (18 s/73 s) and superior selectivity against interfering gases. The sensor also shows good reproducibility and retains ∼60% of its initial response after 35 days of storage under ambient conditions. Compared with pure CuSnO 3 , the sensitivity of In-doped CuSnO 3 is enhanced by ∼2 times, and the response/recovery time is accelerated from 30/118 s to 18/73 s, which can be attributed to the increasing of specific surface area, oxygen vacancies concentration and the formed Cu 2+ /Cu + redox couple induced by In-doping. The results presented here show a pioneering exploration of perovskite Cu 1-x In x SnO 3 for CO sensing, showcasing its potential as a high-performance sensing material. A perovskite-structured Cu 1-x In x SnO 3 hybrid was facilely synthesized via a one-step co-precipitation method and firstly used for high-sensitivity CO detection. Download: Download high-res image (166KB) Download: Download full-size image