Surface-Modified Phthalocyanine-Based Two-Dimensional Conjugated Metal–Organic Framework Films for Polarity-Selective Chemiresistive Sensing

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

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.

Details

OriginalspracheEnglisch
Seiten (von - bis)18666-18672
Seitenumfang7
FachzeitschriftAngewandte Chemie - International Edition
Jahrgang60
Ausgabenummer34
PublikationsstatusVeröffentlicht - 16 Aug. 2021
Peer-Review-StatusJa

Externe IDs

PubMed 34032341
ORCID /0000-0002-8487-0972/work/142247554

Schlagworte

ASJC Scopus Sachgebiete

Schlagwörter

  • 2D conjugated MOFs, chemiresistive sensors, polarity selectivity, surface modification, volatile organic compounds