Hierarchical and Hollow Fe2O3 Nanoboxes Derived from Metal–Organic Frameworks with Excellent Sensitivity to H2S

Hierarchical and hollow porous Fe2O3 nanoboxes (with an average edge length of ∼500 nm) were derived from metal–organic frameworks (MOFs) and the gas sensing characteristics were investigated. Sensors based on Fe2O3 nanoboxes exhibited a response (resistance ratio) of 1.23 to 0.25 ppm (ppm) hydrogen...

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Published inACS applied materials & interfaces Vol. 9; no. 35; pp. 29669 - 29676
Main Authors Tian, Kuan, Wang, Xiao-Xue, Yu, Zhu-Ying, Li, Hua-Yao, Guo, Xin
Format Journal Article
LanguageEnglish
Published American Chemical Society 06.09.2017
Subjects
gas sensor
H2S
nanobox
hierarchical porous nanostructure
Fe2O3
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Summary:Hierarchical and hollow porous Fe2O3 nanoboxes (with an average edge length of ∼500 nm) were derived from metal–organic frameworks (MOFs) and the gas sensing characteristics were investigated. Sensors based on Fe2O3 nanoboxes exhibited a response (resistance ratio) of 1.23 to 0.25 ppm (ppm) hydrogen sulfide (H2S) at 200 °C, the response/recovery speed is fast and the selectivity to H2S is excellent. Remarkably, the sensor showed fully reversible response to 5 ppm of H2S at 50 °C, demonstrating its promise for operating at near room temperature, which is favorable for medical diagnosis and indoor/outdoor environment monitoring. The excellent performance of the Fe2O3 nanoboxes can be ascribed to the unique morphology with high specific surface area (SSA) and porous nanostructure.
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ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.7b07069