ZIF-8 derived ZnO-CsPbBr3 polyhedrons for efficient triethylamine detection

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. • ZIF-8 derived ZnO-CsPbBr 3 polyhedrons are employed as a triethylamine sensor. • Prominently, its response time is 2 s and the detection limit is 5 ppb. • The vinylamine intermediate is firstly confirmed by DRIFT. • Such distinguished performance is closely related to n-n heterojunction.