Hu, Jingjie, Yaun, Qiming, Zhang, Cheng, Zhang, Jian, He, Lifang, Gao, Hongliang, Jin, Ling, Fan, Liyuan, Zhang, Kui, Chu, Xiangfeng, and Meng, Fanli (2022) A facile cotton biotemplate to fabricate porous ZnFe₂O₄ sheets for acetone gas sensing application. Sensors and Actuators B: Chemical, 371. 132587.

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Abstract

Developing methods to synthesize semiconductor oxides with hierarchically porous architecture is an effective way to improve their sensing properties. Herein, a strategy using cotton as biotemplates involving immersion, solvothermal reaction and calcination has been developed to synthesize ZnFe₂O₄ with porous flaky and curly sheets structure. The calcination temperature was optimized, and sensing properties of the as-prepared porous ZnFe₂O₄ sheet composites were investigated. For comparison, without cotton template, ZnFe₂O₄ nanoparticle (NPs) was synthesized. Meanwhile, without solvothermal reaction, ZnFe₂O₄ mixture of fiber-like structure and NPs (ZnFe₂O₄ fiber/NPs) was obtained. Sensors based on these comparison samples showed poor sensing performance to various gases. Whereas, the sensor based on porous ZnFe₂O₄ sheet composite calcined at 600 ℃ exhibited good selectivity, fast response and stability to acetone, and a high response of 66.7–100 ppm was also obtained at 220 ℃. The good sensing performance of the porous ZnFe₂O₄ sheet composite was mainly attributed to its porous structure and the formation of heterojunctions with ZnO and Fe₂O₃ found in the composite. The strategy might also be an effective way to fabricate other porous nanomaterials for applications besides ZnFe₂O₄.

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