Inkjet-printed porphyrinic metal–organic framework thin films for electrocatalysis

Abstract

In this study, a simple and effective direct inkjet printing method was developed to prepare porphyrinic metal-organic framework (MOF) thin films for electrocatalysis. First, crystals of a zirconium-based porphyrinic MOF (MOF-525) with crystal sizes ranging from 100 to 700 nm were synthesized by adjusting the content of benzoic acid in the solvothermal synthetic process. The synthesized crystals showed similar surface area of 2500 m 2 /g with a unique pore size of 1.85 nm. However, some structural defects was found in the smallest crystals of 100 nm due to the fast crystallization process. After suspended in dimethylformamide, the MOF crystal suspensions were inkjet printed to fabricate uniform MOF-525 thin film patterns. With the help of great precision in liquid deposition, thicknesses of the printed MOF-525 thin films can be accurately controlled by the number of printed layers. With smaller crystal size, the printed MOF thin films showed more compact stacking and better contact with the substrate. The printed MOF thin films were applied for electrocatalytic nitrite oxidation. The effects of both film thickness and crystal size on printed film morphology and electrocatalytic activity were investigated in details. The printed MOF nitrite sensor showed a great detection limit of 0.72 μM and a high sensitivity of 40.6 μA/mM-cm 2 . In summary, this study demonstrated the feasibility of the proposed printing process for electrochemically addressable MOF thin films and can be further applied for many other electrochemical applications.

Printed Combinatorial Sensors for Simultaneous Detection of Ascorbic Acid, Uric Acid, Dopamine, and Nitrite

“…Recently, printing sensing materials over chemically inert electrodes have been reported to provide an alternative sensor preparation. 21 These printing methods not only can deposit materials with accurate amounts but can also deliver inks to specific locations with patterns. It would be of scientific interest to utilize these printing methods to deposit GONRs and PEDOT derivatives and investigate the combinatorial effects of these two sensing materials for simultaneous detection of DA, AA, UA, and NO 2 – .…”

In Situ Laser-Induced Fabrication of a Ruthenium-Based Microelectrode for Non-Enzymatic Dopamine Sensing

“…Numerous approaches can be used to manufacture materials with surface areas that demonstrate a high degree of porosity. Among them are inkjet printing [15], direct laser writing (DLW) [16], selective laser sintering (SLS) [17], screen printing [18], and chemical vapor deposition (CVD) [19]. Despite their many merits, some of these methods have substantial shortcomings, such as expensive reagents and equipment [15,18,19], as well as insufficient adhesion properties of the produced structures [17] and low deposition rates [19].…”

One-step synthesis of green emission carbon dots for selective and sensitive detection of nitrite ions and cellular imaging application

“…4 Up to now, a large number of analytical methods have been developed for quantitative analysis of NO 2 À in the aquatic environment, such as chromatography, 5 colorimetry, 6 capillary electrophoresis, 7 spectrophotometry 8 and electrochemical. [9][10][11][12][13] However, among them, some methods usually involve precision instruments, time-consuming and high costs. Therefore, developing more novel low-cost and nontoxic uorescent materials for efficiency determination of nitrite is very important.…”