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首页> 外文期刊>Nanotechnology >Microwave-assisted synthesis of porous and hollow alpha-Fe2O3/LaFeO3 nanostructures for acetone gas sensing as well as photocatalytic degradation of methylene blue
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Microwave-assisted synthesis of porous and hollow alpha-Fe2O3/LaFeO3 nanostructures for acetone gas sensing as well as photocatalytic degradation of methylene blue

机译：微波辅助合成多孔和中空α-Fe2O3 / LafeO3纳米结构的丙酮气体感应以及亚甲基亚甲基的光催化降解

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摘要

To address the urgent issues of hazardous gas detection and the prevention of environmental pollution, various functional materials for gas sensing and catalytic reduction have been studied. Specifically, the p-type perovskite LaFeO3 has been studied widely because of its promising physicochemical properties. However, there remains several problems to develop a controllable synthesis of LaFeO3-based p-n heterojunctions. In this work, alpha-Fe2O3 was further compounded with LaFeO3 to form a porous and hollow alpha-Fe2O3/LaFeO3 heterojunction to improve its gas-sensing performance and photocatalytic efficiency via a microwave-assisted hydrothermal method. While evaluated as sensors of acetone gas, the optimized sample exhibits excellent performance, including a high response (48.3), excellent selectivity, good reversibility, fast response, and recovery ability. Furthermore, it is an efficient catalyst for the degradation of methylene blue. This can be attributed to the enhancement effect of its larger specific surface area, fast diffusion, enhanced surface activities, and p-n heterojunction. Additionally, this work provides a rapid and rational synthesis strategy to produce metal oxides with both enhanced gas-sensing performance and improved photocatalytic properties.
机译：为了解决危险气体检测和防止环境污染的紧急问题，研究了用于气体传感和催化还原的各种功能材料。具体地，由于其有希望的物理化学性质，已经广泛研究了p型钙钛矿Lafeo3。然而，仍有几个问题，以发展基于LafeO3的P-N异质结合的可控合成。在这项工作中，α-Fe 2 O 3进一步配混在LafeO3中以形成多孔和中空α-Fe 2 O 3 / LafeO3异质结，以通过微波辅助水热法来改善其气体传感性能和光催化效率。虽然评估为丙酮气体的传感器，但优化的样品表现出优异的性能，包括高响应（48.3），优异的选择性，良好的可逆性，快速反应和恢复能力。此外，它是亚甲基蓝的降解的有效催化剂。这可以归因于其较大的比表面积，快速扩散，增强的表面活动和P-N异质结的增强效果。另外，该工作提供了一种快速和合理的合成策略，以生产具有增强的气体传感性能和改善的光催化性能的金属氧化物。

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