Triethylamine , as a typical gas of volatile organic compounds, is a growing threat to human health due to its extensive applications in industry. In this study, ZIF-8 derived ZnO polyhedrons are decorated by CsPbBr 3 quantum dots via electrostatic adsorption. Then a highly sensitive sensor towards triethylamine based on ZnO-CsPbBr 3 composite is successfully fabricated. Compared with sensors based on pristine ZnO and ZnO (nanoparticles)-CsPbBr 3 , ZnO-CsPbBr 3 displays a higher response value (~ 60 towards 100 ppm of TEA), shorter response/recovery time (2/18 s), and lower detection limit (5 ppb). Thus, highly-sensitive detection and efficiently-catalytic oxidation of trimethylamine can be achieved. Such distinguished performance can be ascribed to its unique architecture and n-n heterojunction . Notably, the sensing mechanism is thoroughly interpreted by X-ray photoelectron spectroscopy, temperature programmed desorption of O 2 and in-situ diffuse scattering Fourier transform infrared spectra.
Biomass derived nitrogen-doped porous carbon (NPC) has received considerable interest in various fields, resulting from that biomass is abundant, renewable, fast generation and low cost. However, few studies were focused on the gas sensing properties of NPC. In this work, by simple calcination and hydrothermal method, chrysanthemum tea derived NPC is originally introduced on ZIF-8 derived ZnO polyhedrons to form ZnO/NPC heterostructure as a novel acetone sensor. Remarkably, the response of ZnO/NPC towards 100 ppm acetone (25.47) is 8 times more than that of ZnO (3.33) and 14 times higher than that of NPC (1.85). DFT calculations results demonstrate that the adsorption energy between acetone molecules and ZnO/NPC heterostructure is higher than the adsorption energy between acetone molecules and pure NPC (or pure ZnO). These experimental and theoretical results can be adopted for the fundamental investigation of other gas sensing materials based on biomass derived NPC.
危险品化学品经营许可证（带存储）