Surface‐Modified Phthalocyanine‐Based Two‐Dimensional Conjugated Metal–Organic Framework Films for Polarity‐Selective Chemiresistive Sensing. Issue 34 (12th July 2021)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Angewandte Chemie international edition. Volume 60:Issue 34(2021)
• Page Start: 18666
• Page End: 18672
• Publication Date: 2021-07-12
• Subjects: 2D conjugated MOFs -- chemiresistive sensors -- polarity selectivity -- surface modification -- volatile organic compounds; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202104461
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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 Ni2 [MPc(NH)8 ] 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 Ni2 [MPc(NH)8 ] 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. Abstract : Surface‐modification of phthalocyanine‐based two‐dimensional conjugated metal‐organic framework (2D c ‐MOF) films by grafting aliphatic alkyl chains is developed for achieving high‐performance polarity‐selective chemiresistive sensing toward humidity and polar alcohols.