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在NiWO₄SCES绝缘体上替代性合Fe的新兴NO₂气体探测

Jong Hyun Lee¹, Se Hwang Kang², Gi Hyun Park¹

¹Department of Materials Science and Engineering, Yonsei University, Seoul, Republic of Korea.

Frontiers in chemistry

|November 20, 2024

概括

将铁引入- (NiWO) 强相关电子系统 (SCES) 能够进行NO2气体传感. 这种修改激活了典型的绝缘材料,以敏感检测二氧化.

科学领域:

材料科学材料科学材料科学
固态化学固态化学
气体传感器技术技术

背景情况:

-tungstate (NiWO₄) 是一个强相相关的电子系统 (SCES),带有大带间隙 (>3.0 eV),由于强大的库伦比反射,表现出绝缘行为.
内在NiWO₄显示气体传感能力较差,限制了其在环境监测中的应用.
了解和修改SCES属性对于开发新型功能材料至关重要.

研究的目的:

通过在 (Ni) 部位引入替代铁 (Fe) 来研究NiWO₄中气体传感能力的出现.
探索Fe doping对NiWO₄的电子结构和物理性质的影响.
为了评估改性材料的NO₂气体传感性能.

主要方法:

合成单相Fe_0.5Ni_0.5WO₄. 这是一个非常重要的过程.
使用分析结构性,振动性,磁性和电子性质的技术进行表征.
密度函数理论 (DFT) 计算,包括哈伯德U校正,以建模电子结构.
在各种温度下对NO₂进行气体传感测量.

主要成果:

与原始的NiWO相比,Fe_0.5Ni_0.5WO₄表现出[NiO₆]对称振动模式的显著转变和磁化增加.
理论计算证实了宽带间隙的保留,带间隙内的Fe和O水平表明调制的库伦比克排斥.
Fe_0.5Ni_0.5WO₄显示出显著的NO₂气体传感,在200°C时的响应 (R_g/R_a) 为11,低检测极限 (LOD) 为46.4ppb.

结论:

替代性Fe兴奋剂有效调节NiWO₄SCES绝缘体中的库伦比克排斥,使其具有气体感应特性.
开发的Fe-doped NiWO₄材料显示了NO₂检测的有希望的性能.
这项研究提出了一种可行的策略,通过阴离子位子兴奋剂来增强大带间隙SCES材料的功能.

关键词:

二氧化气体是什么 NO2气体这就是NiWO4WO.这就是SCES SCES.气体传感器是一个气体传感器.金属氧化物的金属氧化物.

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