自组装的 (II) 中心金属有机方形网格复合物用于CO2传感
M Sooraj1, R Jayakrishnan2, E Manoj1
1Department of Applied Chemistry, Cochin University of Science and Technology, Kochi, Kerala 682022, India. manoje@cusat.ac.in.
Dalton transactions (Cambridge, England : 2003)
|April 2, 2025
概括
新的金属有机方形复合体显示出作为敏感的二氧化碳 (CO2) 气体传感器的前景. 这些薄膜传感器,特别是复杂的2,即使在照明下,也表现出增强的检测能力,提供了改进的环境监测解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
- 环境科学 环境科学
背景情况:
- 检测危险的二氧化碳 (CO2) 气体对人类健康,环境安全和实现联合国可持续发展目标 (SDGs) 至关重要.
- 由于其可调节的结构和特性,金属有机框架和协调复合体越来越多地被用于气体传感应用.
研究的目的:
- 作为薄膜CO2气体传感器,研究新的Ni (II) 金属有机方格复合体.
- 为了合成和表征两种新的Ni(II) 复合物,即[Ni(HL) ]4Cl4·26H2O (1) 和[Ni(HL) ]4(BF4) 4·20H2O (2),使用一种硫碳水化合物连体 (H2L).
- 为了评估由这些复合物制造的薄膜的二氧化碳传感性能.
主要方法:
- 金属有机方形网格复合物的自组合成.
- 使用单晶X射线衍射 (SCXRD) 和MALDI质谱法进行结构性表征.
- 热稳定性分析 (热重力测量研究) 和毛孔体积测定 (BET表面积).
- 通过滴造制造薄膜传感器的制造以及在化学阻抗模式下评估二氧化碳传感性能,有或没有白光照明.
主要成果:
- 两种稳定的Ni(II) 金属上分子方格复合物 (1和2) 已成功合成和表征.
- 综合体1的溶剂可访问孔体积为1952 Å3 (≈18.2%) 和BET表面积为2.390 m2 g-1.
- 综合体2显示出更高的BET表面积 (4.803 m2 g-1) 和半导体特性,带间隙为1.45 eV.
- 这两种复合体都展示了二氧化碳气体传感能力,复合体2的反应率为59%,复合体1的反应率为31%.
- 在白光照明下,二氧化碳传感性能得到了提高,2号综合体实现了500ppm的检测极限.
结论:
- 合成的Ni (II) 金属有机方形复合体是稳定的,具有适用于气体传感的半导体特性.
- 这些复合体,特别是复合体2的薄膜有效地作为化学阻抗CO2气体传感器发挥作用.
- 开发的二氧化碳气体传感器在照明下表现得更好,复合体2具有更高的灵敏度和较低的检测极限.
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