Construction of Cu₂O@Cu_1.75S Core‐shell Octahedrons for Enhanced NO₂ Gas Sensing at Low Temperature

Abstract

In this work, fabrication of Cu 2 O@Cu 1.75 S coreshell octahedrons was achieved through a facile water bath stirring process. Compared with pure Cu 2 O, the composite showed enhanced sensing performance for NO 2 . The response value of Cu 2 O@Cu 1.75 S to 5 ppm NO 2 at 40 °C is seven times that of Cu 2 O to 5 ppm NO 2 at 75 °C. Moreover, Cu 2 O@Cu 1.75 S has the ability to detect 100 ppb NO 2 and has good NO 2 sensing selectivity and long-term stability. This study shows that Cu 2 O@Cu 1.75 S hybrid is a type of outstanding NO 2 gas sensing material on account of its low working temperature and high sensing sensitivity.

Environmental gas sensors based on electroactive hybrid organic–inorganic nanocomposites using nanostructured materials

“…Nanostructured materials having elevated surface-to-volume ratios and surface mobility are primarily utilized to improve the sensitivity of the metal oxide semiconductor-based gas sensors. 66–74 Various kinds of nanostructures, including carbon nanotubes (CNTs), hollow spheres, and nanowires, are highly efficient for detecting different forms of reducing or oxidizing gases, viz. CO, NH 3 , liquefied petroleum gas (LPG), NO x , O 2 , methanol, ethanol, toluene, and acetone.…”