Wang Mingchao, Zhang Zhe, Zhong Haixia, Huang Xing, Li Wei, Hambsch Mike, Zhang Panpan, Wang Zhiyong, St Petkov Petko, Heine Thomas, Mannsfeld Stefan C B, Feng Xinliang, Dong Renhao
Center for Advancing Electronics Dresden (cfaed) and Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany.
Center for Advancing Electronics Dresden (cfaed) and Faculty of Electrical and Computer Engineering, Technische Universität Dresden, 01062, Dresden, Germany.
Angew Chem Int Ed Engl. 2021 Aug 16;60(34):18666-18672. doi: 10.1002/anie.202104461. Epub 2021 Jul 12.
2D conjugated metal-organic frameworks (2D c-MOFs) are emerging as electroactive materials for chemiresistive sensors, but selective sensing with fast response/recovery is a challenge. Phthalocyanine-based Ni [MPc(NH) ] 2D c-MOF films are presented as active layers for polarity-selective chemiresisitors toward water and volatile organic compounds (VOCs). Surface-hydrophobic modification by grafting aliphatic alkyl chains on 2D c-MOF films decreases diffused analytes into the MOF backbone, resulting in a considerably accelerated recovery progress (from ca. 50 to ca. 10 s) during humidity sensing. Toward VOCs, the sensors deliver a polarity-selective response among alcohols but no signal for low-polarity aprotic hydrocarbons. The octadecyltrimethoxysilane-modified Ni [MPc(NH) ] based sensor displays high-performance methanol sensing with fast response (36 s)/recovery (13 s) and a detection limit as low as 10 ppm, surpassing reported room-temperature chemiresistors.
二维共轭金属有机框架材料（2D c-MOFs）正作为用于化学电阻传感器的电活性材料崭露头角，但实现具有快速响应/恢复的选择性传感是一项挑战。基于酞菁的Ni [MPc(NH) ]二维c-MOF薄膜被用作对水和挥发性有机化合物（VOCs）具有极性选择性的化学电阻器的活性层。通过在二维c-MOF薄膜上接枝脂肪族烷基链进行表面疏水改性，可减少分析物扩散到MOF主链中，从而在湿度传感过程中显著加快恢复进程（从约50秒降至约10秒）。对于VOCs，该传感器在醇类中表现出极性选择性响应，但对低极性非质子烃无信号。基于十八烷基三甲氧基硅烷改性的Ni [MPc(NH) ]的传感器显示出高性能的甲醇传感，具有快速响应（36秒）/恢复（13秒）以及低至10 ppm的检测限，超过了已报道的室温化学电阻器。
