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Nanosheet-assembled, hollowed-out hierarchical γ-Fe2O3 microrods for high-performance gas sensing
- Source :
- Journal of Materials Chemistry A. 8:3754-3762
- Publication Year :
- 2020
- Publisher :
- Royal Society of Chemistry (RSC), 2020.
-
Abstract
- Preventing the stacking of two-dimensional (2D) structured nanomaterials is important for developing high-performance gas sensors. To address this challenge, three-dimensional (3D) hollowed-out hierarchical Fe2O3 microrods assembled by nanosheets were successfully fabricated via a facile MgO-mediated chemical template conversion strategy. Structurally, the large active surface area of the microrods significantly enhanced gas adsorption, thereby resulting in a high response. Additionally, the hollow interior and the well-aligned porous structure between adjacent nanosheets were favorable for the rapid diffusion of detected gases, reducing the response/recovery times. Gas sensing measurements revealed that the nanosheet-assembled, hollowed-out hierarchical γ-Fe2O3 microrods calcined at 300 °C (i.e., Fe2O3-300) exhibited the best performance among the as-prepared samples with different phases. Strikingly, the sensitivity to 100 ppm acetone at 220 °C reached 125.5, and the response/recovery times were only 0.9/15 s, respectively. Compared to α-Fe2O3 obtained at 500 °C (i.e., Fe2O3-500), Fe2O3-300 with the γ-phase exhibits superior capacity to chemisorb oxygen and the bulk resistance effect, which are intrinsically beneficial for enhancing its gas sensing performance. In addition, the as-synthesized nanosheet-assembled, hollowed-out hierarchical γ-Fe2O3 microrods exhibited outstanding repeatability and remarkable long-term stability, which suggests their potential application in fabricating highly sensitive gas sensors. This work provides a viable approach for synthesizing various nanosheet-assembled, hollowed-out hierarchical metal oxides.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
Diffusion
Stacking
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Nanomaterials
law.invention
Metal
Adsorption
Chemical engineering
law
visual_art
visual_art.visual_art_medium
General Materials Science
Calcination
0210 nano-technology
Porosity
Nanosheet
Subjects
Details
- ISSN :
- 20507496 and 20507488
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry A
- Accession number :
- edsair.doi...........db052d58832b6dd16b4f625bca1a2533