Acetone plays a critical role in environmental protection and human healthcare, thus necessitating sensitive and selective detection. In this regard, a resistive microelectromechanical system (MEMS) acetone sensor featuring a sensing layer of
$\alpha $
-Fe2O3 nanoparticles modified tungsten trioxide (WO3) nanoplates is utilized in this work. After optimizing the composition proportion and operating temperature, the Fe/W:0.2 sensor delivered a wide detection range (0.05–80 ppm), and an approximately sevenfold higher response of 40.6 toward 10 ppm acetone at
$217~^{\circ }$
C than pure WO3 analog. In addition, a limit of detection (LoD) of 50 ppb was achieved, which ranks among the lowest cases thus far. Together with excellent repeatability, selectivity, and long-term stability, the sensor also showed a humidity-enhanced response. This work offers an alternative strategy to realize trace acetone detection within high-humidity conditions and showcases a huge application potential in exhaled breath-involving diabetes monitoring in the future.
A W-containing inorganic–organic nanohybrid with a plate-like morphology has been successfully prepared through a nonaqueous synthetic route using WCl6 as the tungsten source and benzyl alcohol as the solvent. The as-prepared hybrid nanomaterial was used directly as an efficient precursor for the formation of WO3 nanoplates via a simple thermal treatment process. The as-obtained WO3 material maintains the plate-like morphology of the precursor and possesses a unique uneven surface structure. It is noted that the use of a inorganic–organic hybrid precursor is essential for the creation of an uneven surface on the WO3 nanoplates, which exhibit high sensitivity and selectivity for the detection of acetone vapour at a relatively low operating temperature (200 °C). The excellent sensing performance of the WO3 nanomaterial is attributed to its unique uneven surface structure besides the small particle size and ultrathin morphology.
危险品化学品经营许可证（带存储）