La-CoO_x/N/C Nanocomposites Derived from Carbon Black-Loaded ZIF-67 for Low-Temperature Detection of Methane

ACS Applied Nano Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 2, 2025

Conventional metal oxide semiconductor (MOS) gas sensors have an inherent disadvantage of high operating temperatures and low sensitivity to weakly polarized gases, such as methane. This study mainly focuses on developing specialized MOS-based for the highly sensitive detection Therefore, we designed prepared Co3O4-based nanocomposites La-CoOx/N/C via pyrolysis a La-doped zeolitic imidazolate framework (ZIF-67) hydrothermally grown carbon black (CB) nanospheres. The resulting material is dominated by hollow nanospheres, owing CB pyrolysis. In as-formed nanocomposite, dispersed La2O3 acts "fence" prevent agglomeration Co3O4 nanoparticles form rich heterojunctions. Meanwhile, N-coordinated (N/C) anchor La-CoOx attachment, which further improves dispersion composite oxides enhances their adsorption capacity methane molecules. Consequently, sensor demonstrated response 1.25 with 4/5 s recovery/response times 600 ppm at relatively temperature (130 °C). Furthermore, methane-sensing mechanism based heterostructure effects first-principles calculations. proposed device that exhibits excellent sensing performance without requiring precious metals.

Язык: Английский

Polymeric photonic crystal platform for organic amines detection based on enzyme inhibition

Analytica Chimica Acta, Год журнала: 2025, Номер 1363, С. 344200 - 344200

Опубликована: Май 14, 2025

Язык: Английский