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

Kuan Tian; Xiao-Xue Wang; Zhu-Ying Yu; Hua-Yao Li; Xin Guo

doi:10.1021/acsami.7b07069

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

ACS Appl Mater Interfaces. 2017 Sep 6;9(35):29669-29676. doi: 10.1021/acsami.7b07069. Epub 2017 Aug 22.

Authors

Kuan Tian^{1

2}, Xiao-Xue Wang¹, Zhu-Ying Yu¹, Hua-Yao Li³, Xin Guo¹

Affiliations

¹ Laboratory of Solid State Ionics, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan 430074, P. R. China.
² Department of Material and Chemical Engineering, Zhengzhou University of Light Industry , Zhengzhou 450001, China.
³ Department of Materials Science and Engineering, Korea University , Seoul 02841, Republic of Korea.

PMID: 28770983
DOI: 10.1021/acsami.7b07069

Abstract

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.

Keywords: Fe2O3; H2S; gas sensor; hierarchical porous nanostructure; nanobox.