@article{Zhao2025, 
author = {Yuli Zhao and Mingyuan Wang and Siwei Liu and Xiangzhao Zhang and Guiwu Liu and Guanjun Qiao},
title = {Pt decorated CoFe2O4/Co3O4 nanosheets derived from 2D Fe–Co MOF for enhanced HCHO detection},
year = {2025},
journal = {Journal of Advanced Ceramics},
volume = {14},
number = {6},
pages = {9221092},
keywords = {nanosheets, heterojunction, gas sensing, Pt/CoFe2O4/Co3O4},
url = {https://www.sciopen.com/article/10.26599/JAC.2025.9221092},
doi = {10.26599/JAC.2025.9221092},
abstract = {Highly sensitive and selective detection of volatile organic compounds (VOCs) is highly important, and designing a suitable microstructure and constructing heterostructures are two main effective strategies for gas-sensing materials to achieve this goal. In this study, Pt nanoparticle-decorated CoFe2O4/Co3O4 nanosheets were prepared via a solution method for highly accurate detection of formaldehyde (HCHO), where the CoFe2O4/Co3O4 nanosheets were derived from a two-dimensional Fe‒Co metal-organic framework (MOF). The response (Rg/Ra, where Rg represents the electrical resistance of the gas sensor when exposed to a specific target gas under defined conditions; Ra denotes the baseline resistance of the gas sensor in clean air) of the ternary Pt2/CoFe2O4/Co3O4 composite to 100 ppm HCHO at 280 °C can be calculated as 95.5, and it still exhibits a very high response to low concentrations of HCHO (1.26 to 50 ppb HCHO gas) and an ultralow limit of detection (LOD) of 6 ppb. The ternary composite also presented excellent reproducibility, selectivity, and long-term stability. The first-principles calculations demonstrated that the Pt/CoFe2O4/Co3O4 model presented the most stable structure and the strongest adsorption capacity for HCHO. The high sensitivity of Pt/CoFe2O4/Co3O4 to HCHO can be attributed mainly to the formation of multiple heterojunctions and the catalytic effect of the Pt nanoparticles. This work describes the facile preparation of MOF-derived multi-heterojunction materials and highlights the superior gas-sensing performance to that of VOCs.}
}