Utilization
of plasmonics as a driving tool for chemical transformation
triggering enables to achieve unprecedented results regarding photochemical
conversion efficiency and chemical selectivity regulation. In this
study, the bimetallic surface plasmon-polariton-supported grating
is proposed as an effective background for plasmon-induced hydrogenation
of alkynyl groups of absolute chemoselectivity. The periodical bimetallic
structure consists of spatially modulated gold layers, covered with
the nanometer-thick platinum layer. The alkyne bonds are covalently
attached to the surface of the catalytic system through covalent grafting
of the bimetallic surface with 4-ethynylbenzenediazonium tosylate,
with triple bonds separated from the platinum layer by the benzene
rings. The proposed bimetallic structure enables selective hydrogenation
of alkyne bonds to alkenyl or alkyl moieties using cyclohexene as
a hydrogen source. The selectivity of hydrogenation can be controlled
by changing the structure parameters, for example, the thickness of
the upper platinum layer.
Surface‐modified gold multibranched nanoparticles (AuMs) were prepared by simple chemical reduction of gold chloride aqueous solution followed by in situ modification by using water‐soluble arenediazonium tosylates with different functional organic groups. Chemical and morphological structures of the prepared nanoparticles were examined by using transmission electron and scanning electron microscopies. The covalent grafting of organic compounds was confirmed by scanning electron microscopy with energy dispersive X‐ray spectroscopy (SEM‐EDX) and Raman spectroscopy techniques. Covalent functionalization of nanoparticles significantly expands the range of their potential uses under physiological conditions, compared with traditional non‐covalent or thiol‐based approaches. The antibacterial effect of the surface‐modified AuMs was evaluated by using Escherichia coli and Staphylococcus epidermidis bacteria under IR light illumination and without external triggering. Strong plasmon resonance on the AuMs cups leads to significant reduction of the light power needed kill bacteria under the mild conditions of continuous illumination. The effect of the surface‐modified AuMs on the light‐induced antibacterial activities was founded to be dependent on the grafted organic functional groups.
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