Abstract
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 CsPbBr3 quantum dots via electrostatic adsorption. Then a highly sensitive sensor towards triethylamine based on ZnO-CsPbBr3 composite is successfully fabricated. Compared with sensors based on pristine ZnO and ZnO (nanoparticles)-CsPbBr3, ZnO-CsPbBr3 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 O2 and in-situ diffuse scattering Fourier transform infrared spectra.
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