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特定的Sn-O-Fe活性位点从原子性Sn-Doping有孔的Fe₂O₃用于超敏感的NO₂检测

Yihong Zhong¹, Guotao Yuan², Dequan Bao³

¹Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou, 215123, People's Republic of China.

Nano-micro letters

|May 25, 2025

概括

与锡 (Sn) 进行原子合的多孔氧化铁 (Fe2O3) 形成了独特的Sn-O-Fe位点. 这些位置显著提高了气体传感器在低温下检测二氧化 (NO2) 的灵敏度和选择性.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
化学工程是化学工程的重要组成部分.

背景情况:

基于金属氧化物的传统气体传感器由于吸附点有限,往往表现出不良的灵敏度和交叉灵敏度.
开发具有增强性能的先进气体传感材料对于环境监测和安全应用至关重要.

研究的目的:

为了研究原子兴奋剂对多孔Fe2O3.3的气体传感特性的影响.
为高度敏感和选择性二氧化 (NO2) 检测创建高效的吸附点.

主要方法:

原子合有孔的Fe2O3与Sn原子形成Sn-O-Fe位点.
使用X射线吸收光谱和原子分辨率扫描传输电子显微镜进行表征.
在150°C时对NO2的气体传感性能评估,包括灵敏度,选择性和检测极限.
理论计算以了解吸附机制.

主要成果:

原子成功地被纳入Fe2O3网格,形成独特的Sn-O-Fe位点.
与Fe-O-Fe和Sn-O-Sn站点相比,Sn-O-Fe站点对1ppmNO2具有更高的灵敏度 (Rg/Ra = 2646.6),比Fe-O-Fe和Sn-O-Sn站点更高.
实现了超低的检测极限 (10ppb) 和对NO2的增强选择性.
理论计算证实了Sn-O-Fe位点上更强的NO2吸附,带间隙减少促进了电子转移.

结论:

用Sn进行原子兴奋剂是一种有效的策略,用于在金属氧化物中创建定制的吸附点,用于气体传感.
开发的Sn-doped Fe2O3在低工作温度下对NO2表现出高灵敏度,选择性和低检测极限.
这种方法为设计下一代高性能气体传感器提供了一个有希望的途径.

关键词:

原子兴奋剂是一种原子性兴奋剂.气体传感器是一个气体传感器.检测NO2的检测方法特定的SnOFe站点特定吸附的特定吸附.

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