Impregnation of Graphene Quantum Dots into a Metal–Organic Framework to Render Increased Electrical Conductivity and Activity for Electrochemical Sensing

Abstract

Graphene quantum dots (GQD) with an average size of 3 1 nm were incorporated into a mesoporous porphyrinic zirconium-based metal–organic framework (MOF) by direct impregnation to render the donor–acceptor charge transfer from GQDs to porphyrinic linkers The hybrid material still possesses around half porosity of the pristine MOF and shows a 100-fold higher electrical conductivity compared to that of the parent MOF By utilizing the porphyrinic linkers as catalytically active units the GQD-MOF material exhibits a better electrochemical sensing activity toward nitrite in aqueous solutions compared to both the pristine MOF and GQD The linear range of the hybrid material for the determination of nitrite is 40-18000 μM and the limit of detection is 6 4 μM

Date of Award	2020
Original language	English
Supervisor	Chung-Wei Kung (Supervisor)