Two‐Dimensional Conjugated Metal‐Organic Frameworks with Large Pore Apertures and High Surface Areas for NO2 Selective Chemiresistive Sensing

Abstract

AbstractThe emergence of two‐dimensional conjugated metal–organic frameworks (2D c‐MOFs) with pronounced electrical properties (e.g., high conductivity) has provided a novel platform for efficient energy storage, sensing, and electrocatalysis. Nevertheless, the limited availability of suitable ligands restricts the number of available types of 2D c‐MOFs, especially those with large pore apertures and high surface areas are rare. Herein, we develop two new 2D c‐MOFs (HIOTP‐M, M=Ni, Cu) employing a large p‐π conjugated ligand of hexaamino‐triphenyleno[2,3‐b:6,7‐b′:10,11‐b′′]tris[1,4]benzodioxin (HAOTP). Among the reported 2D c‐MOFs, HIOTP‐Ni exhibits the largest pore size of 3.3 nm and one of the highest surface areas (up to 1300 m2 g−1). As an exemplary application, HIOTP‐Ni has been used as a chemiresistive sensing material and displays high selective response (405 %) and a rapid response (1.69 min) towards 10 ppm NO2 gas. This work demonstrates significant correlation linking the pore aperture of 2D c‐MOFs to their sensing performance.