In situ diffusion growth of CoMoO 4 nanoparticles on the surface of MoO 3 nanobelts was achieved through a facile method. The microstructures, morphologies, and chemical composition of the nanocomposites were investigated based on X-ray diffraction, field-emission electron scanning microscopy, transmission electron microscopy , energy dispersive spectroscopy, and X-ray photoelectron spectra. The characterization results confirmed CoMoO 4 nanoparticles uniformly distributed on the surface of the MoO 3 nanobelts. The trimethylamine sensing properties of pristine MoO 3 and CoMoO 4 /MoO 3 nanocomposites were investigated using a static system. The experimental results revealed that heterojunction structure of CoMoO 4 /MoO 3 nanocomposites displayed low working temperature and enhanced sensing performance. The response of CoMoO 4 /MoO 3 nanocomposites to 100 ppm trimethylamine was ∼104.8 at 220 °C, which was four times higher than that of pure MoO 3 at 280 °C. The reason for the enhanced sensing properties of CoMoO 4 /MoO 3 nanocomposites is attributed mainly to the formation of the p–n junction between the p-type CoMoO 4 nanoparticles and the n-type MoO 3 nanobelts.
Ji Li,Ruoqi Xiao,Xiaoli Cheng,Xianfa Zhang,Yingming Xu,Lihua Huo
The effective detection of diisopropylamine gas is one of great significance in industrial production and human health. In this study, the availably detect of diisopropylamine gas was achieved by constructing CoMoO 4 /MoO 3 materials. The CoMoO 4 /MoO 3 sensor has highly selective diisopropylamine (S=87.6–10 ppm diisopropylamine) at 170 °C, with a response time of only 5.3 s. The lowest detection limit of the sensor is 5 ppb, which is the lowest detection limit in diisopropylamine gas sensors to date. Meanwhile, the CoMoO 4 /MoO 3 sensor also shows perfect diisopropylamine gas selectivity, moisture resistance, and long-term stability. Based on the advantages of p-n heterostructures and the synergistic effect of 2D nanosheets , CoMoO 4 /MoO 3 materials exhibits excellent diisopropylamine gas sensing properties. This work provides useful guidance for constructing of high-performance diisopropylamine sensors in the future.
危险品化学品经营许可证（带存储）