Recently,
the direct utilization of plasmonic metal nanostructures in accelerating
the electrochemical reactions reveals the importance of hot charge
carriers generated by localized surface plasmon resonance (LSPR).
However, the effect of morphological forms of the same metal element
on direct plasmon-enhanced electrocatalytic activity has not yet been
well documented. Herein, four kinds of Au nanostructures with different
morphologies of nanospheres (NSPs), nanorods (NRs), nanostars (NSs),
and triangular nanoplates (NPLs) were synthesized. The shape-dependent
plasmonic enhancement effect of Au nanostructures toward the electrooxidation
of ascorbic acid (AA) was studied. We find that the electrochemistry
of AA oxidation on these Au nanostructures can be enhanced upon light
irradiation with the higher enhancement effect of the Au NPLs and
NSs than the Au NSPs and NRs. This shape-dependent enhancement effect
is suggested to be related to the number of “hot spots”
in different NP surfaces generated from Au LSPR. Thus, the present
work would shed new light on the direct plasmon-enhanced electrochemistry,
which helps in widening the potential applications of plasmonic materials
in electrochemical sensors and electrochemical energy conversion.
Among
the members of the rapidly growing nanozyme family, plasmonic
nanozymes stand out because of their unique localized surface plasmon
resonance (LSPR) characteristics and tunable catalytic activity. We
prepared a plasmonic nanozyme of Au gold nanoparticles (AuNPs) and
Cu metal–organic framework nanosheets (Cu-MOFNs). The Cu-MOFNs
have peroxidase-like activity, while AuNPs present unique LSPR characteristics.
We found that the as-prepared AuNPs/Cu-MOFNs composite presents 1.6-fold
faster reaction kinetics under LSPR excitation compared to that in
the dark. Investigations of energy levels, radical capture, and dark-field
scattering spectroscopy revealed that LSPR of AuNPs as well as matched
energy levels can facilitate efficient hot electron transfer, which
could readily cleave the chemical bond of the substrate and accelerate
the reaction kinetics. On the basis of these results, we achieved
enhanced antibacterial therapy and wound healing using plasmonic AuNPs/Cu-MOFNs.
This study spotlights the superiority of plasmonic nanozymes in improving
the enzyme-like performance of nanozymes.
The plasmon-induced “dual excited synergistic effect” over an AuNSs/Zn-MOFs composite offers an excellent and versatile strategy to improve the antibacterial performance of MOFs without any additional antibacterial agents.
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