posted on 2024-01-26, 23:05authored byAndrews Boakye, Kun Yu, Huining Chai, Tailin Xu, Lystra Sarah Houston, Benjamin K. Asinyo, Xueji Zhang, Guangyao Zhang, Lijun Qu
Due
to their highly exposed active sites and high aspect ratio
caused by their substantial lateral dimension and thin thickness,
two-dimensional (2D) metal–organic framework (MOF) nanosheets
are currently considered a potential hybrid material for electrochemical
sensing. Herein, we present a nickel-based porphyrinic MOF nanosheet
as a versatile and robust platform with an enhanced electrochemical
detection performance. It is important to note that the nickel porphyrin
ligand reacted with Cu(NO3)2·3H2O in a solvothermal process, with polyvinylpyrrolidone (PVP) acting
as the surfactant to control the anisotropic development of creating
a 2D Cu–TCPP(Ni) MOF nanosheet structure. To realize the exceptional
selectivity, sensitivity, and stability of the synthesized 2D Cu–TCPP(Ni)
MOF nanosheet, a laser-induced graphene electrode was modified with
the MOF nanosheet and employed as a sensor for the detection of p-nitrophenol (p-NP). With a detection
range of 0.5–200 μM for differential pulse voltammetry
(DPV) and 0.9–300 μM for cyclic voltammetry (CV), the
proposed sensor demonstrated enhanced electrochemical performance,
with the limit of detection (LOD) for DPV and CV as 0.1 and 0.3 μM,
respectively. The outstanding outcome of the sensor is attributed
to the 2D Cu–TCPP(Ni) MOF nanosheet’s substantial active
surface area, innate catalytic activity, and superior adsorption capacity.
Furthermore, it is anticipated that the proposed electrode sensor
will make it possible to create high-performance electrochemical sensors
for environmental point-of-care testing since it successfully detected p-NP in real sample analysis.