Plasmon
stimulation is an intriguing method to modulate the enzyme-mimic
functions of nanomaterials, while utilization of plasmon excitation
remains of low efficiency. Herein, by loading nitrogen-doped graphdiyne
quantum dots (N-GDQDs) onto gold–silver nanocages (AuAg NCs),
hollow cube-shaped N-GDQDs/AuAg NC heterostructures with strong local
surface plasmon resonance (LSPR) response in the near-infrared (NIR)
region are reported. This nanozyme can concurrently harvest LSPR-induced
hot carriers and produce photothermal effects, resulting in a significantly
enhanced peroxidase-like activity upon 808 nm irradiation. Both experimental
data and theoretical calculations reveal that the remarkable catalytic
performance of N-GDQDs/AuAg NCs results from the narrow band gap semiconductor
characteristics of N-GDQDs, LSPR effect of AuAg NCs, and fast interfacial
electron transfer dynamics. Moreover, this nanozyme is demonstrated
to achieve >99.999% antibacterial efficiency against methicillin-resistant Staphylococcus aureus (MRSA), S. aureus, and Escherichia coli in 10 min in
vitro and in vivo. This study not only sheds light on the mechanism
of the nanozyme/photocatalysis coupling process but also provides
a new avenue for rationally designing plasmonic metal/semiconductor-involved
nanozymes for synergistic photothermal and photoenhanced nanozyme
therapy.
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