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Missing-Linker 2D Conductive Metal Organic Frameworks for Rapid Gas Detection
ACS Sensors ( IF 8.2 ) Pub Date : 2021-01-11 , DOI: 10.1021/acssensors.0c01933 Congyue Liu 1 , Yuming Gu 2 , Cheng Liu 1 , Shengtang Liu 1 , Xiaoshan Li 1 , Jing Ma 2 , Mengning Ding 1
ACS Sensors ( IF 8.2 ) Pub Date : 2021-01-11 , DOI: 10.1021/acssensors.0c01933 Congyue Liu 1 , Yuming Gu 2 , Cheng Liu 1 , Shengtang Liu 1 , Xiaoshan Li 1 , Jing Ma 2 , Mengning Ding 1
Affiliation
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The structural diversity and tunability of metal organic frameworks (MOFs) represent an ideal material platform for a variety of practical scenarios ranging from gas storage/separation to catalysis, yet their application in chemiresistive gas sensing is relatively lacking, due to the requirements of combined electrical conductivity and optimized gas adsorption properties. Here, we report an effective chemical sensing strategy based on missing-linker two-dimensional conductive MOF, with incorporated defects via a simple ligand oxidization method. The multiple hydroxyl defect sites in the conductive 2D missing-linker amorphous Ni-HAB (aNi-HAB) enable rapid adsorption and desorption of water molecules compared to crystalline Ni-HAB (cNi-HAB). As a result, the aNi-HAB sensory device shows good sensitivity, selectivity, linearity, fast response/recovery rate, and excellent stability, which can be further improved by Nafion functionalization. Theoretical investigations including transient current measurement, density functional theory (DFT) calculations, and systematic performance evaluation of isostructural 2D aM-HAB (M = Cu, Fe, Co) MOF showed that unique transport mechanism and adsorption/activation energies originated from hydrogen bonding at defective sites are critical for enhanced humidity response, and further confirmed that defect engineering through missing linker incorporation is a general and effective approach to tune the sensing properties of conductive MOF materials.
中文翻译：
用于快速气体检测的Missing-Linker 2D导电金属有机框架
金属有机框架（MOF）的结构多样性和可调谐性代表了从气体存储/分离到催化的各种实际情况的理想材料平台，但是由于组合电的要求，它们在化学阻滞气体传感中的应用相对缺乏。电导率和优化的气体吸附性能。在这里，我们报告基于缺失的连接器二维导电MOF的有效的化学传感策略，通过简单的配体氧化方法结合缺陷。与结晶Ni-HAB（cNi-HAB）相比，导电2D缺失连接剂无定形Ni-HAB（aNi-HAB）中的多个羟基缺陷位点能够快速吸附和解吸水分子。结果，aNi-HAB传感设备显示出良好的灵敏度，选择性，线性，Nafion功能化可以进一步提高响应/恢复速度，以及出色的稳定性。理论研究包括瞬态电流测量，密度泛函理论（DFT）计算以及同构2D aM-HAB（M = Cu，Fe，Co）MOF的系统性能评估，结果表明，独特的传输机制和吸附/活化能源自氢键有缺陷的部位对于增强湿度响应至关重要，并进一步证实，通过缺失连接子并入来进行缺陷工程是调节导电MOF材料感测特性的通用且有效的方法。
更新日期：2021-02-26
中文翻译：
用于快速气体检测的Missing-Linker 2D导电金属有机框架
金属有机框架（MOF）的结构多样性和可调谐性代表了从气体存储/分离到催化的各种实际情况的理想材料平台，但是由于组合电的要求，它们在化学阻滞气体传感中的应用相对缺乏。电导率和优化的气体吸附性能。在这里，我们报告基于缺失的连接器二维导电MOF的有效的化学传感策略，通过简单的配体氧化方法结合缺陷。与结晶Ni-HAB（cNi-HAB）相比，导电2D缺失连接剂无定形Ni-HAB（aNi-HAB）中的多个羟基缺陷位点能够快速吸附和解吸水分子。结果，aNi-HAB传感设备显示出良好的灵敏度，选择性，线性，Nafion功能化可以进一步提高响应/恢复速度，以及出色的稳定性。理论研究包括瞬态电流测量，密度泛函理论（DFT）计算以及同构2D aM-HAB（M = Cu，Fe，Co）MOF的系统性能评估，结果表明，独特的传输机制和吸附/活化能源自氢键有缺陷的部位对于增强湿度响应至关重要，并进一步证实，通过缺失连接子并入来进行缺陷工程是调节导电MOF材料感测特性的通用且有效的方法。
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