Properties
of metal–organic frameworks (MOFs) are determined
by metal centers, organic ligands, and applied synthesis methods.
For electrosynthesis of MOFs, the applied potential is expected to
play a key role in determining the morphology, thickness, electrochemical
properties, and applications of MOFs. Herein, Cu-BTC (H3BTC: 1,3,5-benzenetricarboxylic acid) films are electrosynthesized
at different cathodic potentials. They feature different morphologies,
thicknesses, and amounts of active copper centers, although they do
show similar bonding properties, chemical compositions, phase purity,
crystallinity, and surface electronic states of copper centers. Using
nicotine amide adenine dinucleotide, the sensing application of these
Cu-BTC films is explored, showing potential-dependent catalytic ability.
Further monitoring of six other organic compounds (herein xanthine,
hypoxanthine, diethylstilbestrol, estradiol, sunset yellow, and tartrazine)
reveals the morphology and thickness of Cu-BTC films and the amount
of copper centers inside these Cu-BTC films determines the accumulation
or sensing ability of Cu-BTC films. Highly sensitive detection of
these molecules individually and simultaneously is achieved with Cu-BTC
electrosynthesized at −1.30 V. Electrosynthesized Cu-BTC films
are thus excellent electrode materials for sensitive sensing of various
analytes.
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