Reviewed by Lexie CornerMay 28 2025
In a examine revealed within the Journal of Superior Ceramics on Could 14, 2025, a analysis staff led by Guiwu Liu from Jiangsu College, China, reported the synthesis of Pt nanoparticle-decorated CoFe2O4/Co3O4 utilizing a solution-based methodology for the selective detection of formaldehyde (HCHO). The nanosheets had been derived from a two-dimensional Fe-Co metal-organic framework (MOF).
The ensuing Pt2/CoFe2O4/Co3O4 composite demonstrated robust sensing efficiency for HCHO, together with excessive sensitivity, selectivity, repeatability, and long-term stability. The sensor responded to HCHO concentrations between 95.5 and 100 ppm at 280 °C and exhibited a detection restrict as little as 6 ppb.
Temperature-programmed desorption (TPD) and in situ diffuse reflectance infrared Fourier rework spectroscopy (DRIFTS) had been used to review HCHO adsorption and desorption on the fabric floor. Density useful principle (DFT) calculations confirmed that the Pt2/CoFe2O4/Co3O4 construction had the bottom adsorption vitality and was essentially the most steady configuration amongst these examined.
Theoretical analyses prompt that the fabric’s sensing capacity stems from electron switch throughout heterogeneous interfaces and floor reactions with HCHO. The improved sensitivity is attributed to the formation of a number of heterojunctions and the catalytic exercise of the Pt nanoparticles.
This work presents a simple method to producing high-performance risky natural compound (VOC) sensors by fabricating MOF-derived heterojunctions embellished with noble metals.
On this work, we synthesized Pt nanoparticles modified CoFe2O4/Co3O4 nanosheets derived by 2D Fe-Co MOF by a facile answer methodology, and explored the optimum loading capability of Pt. The Pt2/CoFe2O4/Co3O4 composite displays excellent sensing efficiency to HCHO, together with sensitivity, selectivity, reproducibility, and long-term stability. The Pt2/CoFe2O4/Co3O4 sensor achieves a response of 95.5 to 100 ppm HCHO at 280 ºC and a theoretical LOD of 6 ppb.
Guanjun Qiao, Professor, Faculty of Supplies Science and Engineering, Jiangsu College
Moreover, Guanjun Qiao is a senior specialist whose analysis focuses on gas-sensitive supplies and sensors, light-thermal-electrical conversion units, and superior ceramics and their composites.
Qiao added, “Two-dimensional metal-organic frameworks (2D MOFs) primarily based on transition metals (Fe, Co, Ni, and so on) are thought of to be promising self-template gasoline sensing supplies proudly owning to bigger particular floor space derived from the porous construction, which may make them have a number of lively websites in gasoline sensing reactions.”
Floor modification with noble metallic nanoparticles usually results in important efficiency enhancements as a result of mixed results of enhanced catalytic exercise and improved dispersion. Notably, 2D supplies will help forestall noble metals from agglomerating, permitting for uniform distribution throughout the nanosheet floor.
“Utilizing 2D Fe-Co MOFs as a precursor can obtain the impact of killing two birds with one stone,” added Guanjun Qiao.
The Pt2/CoFe2O4/Co3O4 composite demonstrated the strongest response among the many samples examined, displaying reactivity 14.7, 6.77, and a pair of.9 instances greater than CoFe2O4, Co3O4, and CoFe2O4/Co3O4, respectively. The elevated responsiveness of CoFe2O4/Co3O4 is primarily attributed to the formation of p–p junctions.
Moreover, CoFe2O4/Co3O4 synthesized utilizing a 2D MOF template exhibited a reactivity of 33 to HCHO, which is considerably greater than that of bulk CoFe2O4/Co3O4 (20.5). This enchancment is as a result of bigger particular floor space and larger variety of reactive websites within the 2D-MOF-derived materials.
Qiao famous, “For the Pt2/CoFe2O4/Co3O4, the loading of Pt nanoparticles ends in the formation of Schottky heterojunctions with CoFe2O4 and Co3O4, additional enhancing the gasoline sensing efficiency. Moreover, the launched small-sized Pt can act as a catalyst for chemical sensitization to dissociate oxygen molecules, improve the quantity of oxygen species adsorbed on the floor, and enhance the sensitivity of supplies.”
Yuli Zhao, Xiangzhao Zhang, and Guiwu Liu from the Faculty of Supplies Science and Engineering at Jiangsu College in Zhenjiang, China; Mingyuan Wang from the Faculty of Mechanical Engineering, Jiangsu College; and Siwei Liu from the Key Laboratory for Concept and Expertise of Clever Agriculture Equipment and Tools at Jiangsu College additionally contributed to the examine.
This analysis was supported by the Nationwide Pure Science Basis of China (Grant No. 51950410596), Jiangsu Province’s Key Analysis and Improvement Plan (BE2019094), the Innovation and Entrepreneurship Program (JSSCTD202146), and the Jiangsu Funding Program for Glorious Postdoctoral Expertise (2024ZB216).
The analysis staff extends their gratitude to Jiangsu College’s Excessive Efficiency Computing Platform and the Superior Computing East China Sub-center for offering the computational sources used on this examine.
Journal Reference:
Zhao, Y., et al. (2025). Pt embellished CoFe2O4/Co3O4 nanosheets derived from 2D Fe–Co MOF for enhanced HCHO detection. Journal of Superior Ceramics. doi.org/10.26599/jac.2025.9221092.
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