Insights into dehydration of layered cobalt hydroxide for gas sensor application with low-temperature response behavior

作者：Li, Junyao; Li, Ruixiang; Sang, Chuanye; Xu, Mingji; Luo, Chunhua; Peng, Hui; Lin, Hechun^*

来源：Materials Chemistry and Physics, 2024, 315: 128977.

DOI：10.1016/j.matchemphys.2024.128977

• Layered metal hydroxides
• Dehydration
• Nanostructure
• Layered cobalt hydroxide gas sensor
• Semiconductor

Dehydration of layer metal hydroxides at controlled annealing temperatures is an efficient strategy for regulating the material properties. In this work, we studied the dehydration process of alpha-Co(OH)(2) with flower-like nanostructure under various conditions and explored their gas sensing application. Stable dehydrated alpha-Co(OH)(2) obtained by solidification in air at 140 degrees C, exhibits specific selective low-temperature gas-sensing behavior for Et3N. The response to 50 ppm Et3N was up to 9.52 at 140 degrees C operating temperature with short response and recovery time. The sensor is the high reversibility and the excellent reproducibility with ppb level detection limit. The partial oxidation of the dehydration alpha-Co(OH)(2) in the air has a significant impact on the sensing performance. The large specific surface area of the dehydration alpha-Co(OH)(2) affords rich reactive sites for both reaction and adsorption of Et3N molecules. This research provides a new solution for building low-temperature high-performance amine sensor.