Jia Xilin, Wang Ning, Tian Junlong, Zhang Yong, Lu Donglin, Tan Junjiang, Qiao Ruyi, Chen Lulu, Zhang Wang, Zhong Jianxin
Hunan Key Laboratory of Micro-Nano Energy Materials and Devices, Laboratory for Quantum Engineering and Micro-Nano Energy Technology, School of Physics and Optoelectronic, Xiangtan University Hunan 411105 P. R. China
Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (Nanjing Tech) 30 South Puzhu Road Nanjing 211816 P. R. China.
RSC Adv. 2019 Jun 26;9(35):19993-20001. doi: 10.1039/c9ra02064k. eCollection 2019 Jun 25.
Metal oxide gas sensors with porous structures are widely used in numerous applications ranging from health monitoring and medical detection to safety; in this study, we report a highly sensitive SnO gas sensor with a multi-level tube/pore structure prepared biomimetic technology using flax waste as a bio-template and a simple wet chemical process combined with subsequent annealing. Indeed, MLTPS not only maintained and improved the excellence of porous structure gas sensing materials with abundant active sites and large surface-to-volume ratios, but also overcame the deficiency of the lack of gas diffusion channels in porous gas sensing materials. Thus, this novel multi-level tube/pore SnO gas sensor exhibited significantly enhanced sensing performance, an ultra-low response concentration (250 ppb), a high response (87.9), a fast response (9.2 s), a low operating temperature (130 °C) and good stability, for formaldehyde. On the basis of these results, the reuse of agricultural waste, this study provides a new concept for the low-cost synthesis of environmentally friendly and effective multi-level tube/pore gas sensor materials.
具有多孔结构的金属氧化物气体传感器广泛应用于从健康监测、医学检测到安全等众多领域；在本研究中，我们报告了一种具有多级管/孔结构的高灵敏度SnO气体传感器，该传感器采用亚麻废料作为生物模板，通过仿生技术以及简单的湿化学工艺并结合后续退火制备而成。事实上，多级管/孔结构不仅保留并提升了具有丰富活性位点和大比表面积的多孔结构气体传感材料的优异性能，还克服了多孔气体传感材料中缺乏气体扩散通道的不足。因此，这种新型的多级管/孔SnO气体传感器对甲醛表现出显著增强的传感性能，具有超低的响应浓度（250 ppb）、高响应度（87.9）、快速响应（9.2 s）、低工作温度（130 °C）以及良好的稳定性。基于这些结果，本研究实现了农业废料的再利用，为低成本合成环保且有效的多级管/孔气体传感器材料提供了新的概念。
