MOF-derived hierarchical ZnO/ZnFe2O4 hollow cubes for enhanced acetone gas-sensing performance. Issue 55 (11th July 2017)

• Record Type: Journal Article
• Authors: Ma, Xiang; Zhou, Xinyuan; Gong, Yan; Han, Ning; Liu, Haidi; Chen, Yunfa
• Is Part Of: RSC advances. Volume 7:Issue 55(2017)
• Page Start: 34609
• Page End: 34617
• Publication Date: 2017-07-11
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra04437b
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A simple and direct pyrolysis of Fe III modified IRMOF-3 is employed to synthesize ZnO/ZnFe2 O4 hollow cubes for enhanced acetone gas sensing. Abstract : ZnO/ZnFe2 O4 hollow cube composites with heterogeneous structure are synthesized by a facile strategy through simple and direct pyrolysis of Fe III -modified Zn-based metal–organic frameworks. The as-synthesized ZnO/ZnFe2 O4 hollow cubes have well-defined cube morphology with an ∼2 μm and multiple porous shell constructed from interpenetrated ZnO and ZnFe2 O4 heterogeneous nanoparticles, providing structurally combined mesoporous channels for facilitating the diffusion and surface reaction of gas molecules. In addition, a comparative sensing performance investigation between ZnO/ZnFe2 O4 hollow cubes and singular ZnO demonstrates that, in contrast with ZnO, the ZnO/ZnFe2 O4 hollow cubes show significantly enhanced chemical sensing sensitivity towards low-concentration acetone. Furthermore, the ZnO/ZnFe2 O4 hollow cubes exhibit good reproducibility and selectivity towards gaseous acetone. The enhanced sensing performance of the MOF-derived ZnO/ZnFe2 O4 hollow cubes is ascribed to the unique hierarchical structure with high specific surface area, abundant exposed active sites with surface-adsorbed oxygen species and heterojunctions formed at the interfaces between ZnO and ZnFe2 O4 .