A High‐Entropy Strategy for Chemoresistive Ethanol Sensors With Remarkably Rapid and Selective Response

ABSTRACT Chemoresistive gas sensors based on metal oxide semiconductors provide a stable and low‐cost platform for gas monitoring. However, single‐metal oxides exhibit limited sensitivity and selectivity due to insufficient active sites and weak catalytic activity. Although metal doping and noble‐metal decoration provide partial improvements, these strategies remain constrained by dopant instability, restricted compositional diversity, and high material costs of noble metals. High‐entropy materials offer an attractive platform for tuning structure and reactivity through large configurational entropy, which induces lattice distortion, diverse electronic coordination, and defect‐rich environments. Here, we present an ethanol (C 2 H 5 OH) gas sensor based on high‐entropy oxide (HEO) nanostructures composed of In, Sn, Fe, Zn, and W. The HEO‐based sensor exhibits a higher response to ethanol …