Zhang Dongming, Chen Mingpeng, Zou Haiyuan, Zhang Yumin, Hu Jicu, Wang Huapeng, Zi Baoye, Zhang Jin, Zhu Zhongqi, Duan Lele, Liu Qingju
School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/nano Materials & Technology, Yunnan University, Kunming 650091, People's Republic of China.
Nanotechnology. 2020 May 22;31(21):215601. doi: 10.1088/1361-6528/ab73b5. Epub 2020 Feb 7.
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 LaFeO has been studied widely because of its promising physicochemical properties. However, there remains several problems to develop a controllable synthesis of LaFeO-based p-n heterojunctions. In this work, α-FeO was further compounded with LaFeO to form a porous and hollow α-FeO/LaFeO 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.
为解决有害气体检测和环境污染防治的紧迫问题，人们对各种用于气体传感和催化还原的功能材料进行了研究。具体而言，p型钙钛矿LaFeO因其具有良好的物理化学性质而受到广泛研究。然而，开发可控合成的LaFeO基p-n异质结仍存在若干问题。在这项工作中，通过微波辅助水热法将α-FeO与LaFeO进一步复合，形成多孔中空的α-FeO/LaFeO异质结，以提高其气敏性能和光催化效率。在作为丙酮气体传感器进行评估时，优化后的样品表现出优异的性能，包括高响应度（48.3）、优异的选择性、良好的可逆性、快速的响应和恢复能力。此外，它还是一种降解亚甲基蓝的高效催化剂。这可归因于其较大的比表面积、快速扩散、增强的表面活性和p-n异质结的增强作用。此外，这项工作提供了一种快速合理的合成策略，以制备具有增强气敏性能和改善光催化性能的金属氧化物。
