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One-Pot Aqueous Synthesis of Icosahedral Au as Bifunctional Candidates for Enhanced Glucose Electrooxidation and Surface-Enhanced Raman Scattering
journal contribution
posted on 2020-02-25, 19:39 authored by Man Xu, Lichun Zhang, Fengzhou ZhaoBifunctional
candidates, which could provide catalytic and plasmonic
properties simultaneously, could activate a promising development
for biomedicine. Here, we kinetically controlled and synthesized a
penta-twinned icosahedral Au (Ih Au) by a facile wet-chemical protocol
without assistance of stabilizers. Benefiting from icosahedral morphology
and kinetic synthesis process, the Ih Au nanoparticles (NPs) incorporate
three key advantages: (i) ample active sites/“hot spots”
and surface strain, (ii) good stability/chemical inertness and easy
functionalization, and (iii) biological compatibility and a clean
surface, which could promote their electrocatalysis and photonic capacity.
Ih Au NPs, as bifunctional nanomaterials, exert excellent electrocatalytic
and surface-enhanced Raman scattering (SERS) performances. Ih Au delivers
the highest glucose electrooxidation (GEO) peak current density with
6.87 mA cm–2, which is 14 times larger than that
of Turkevich Au (0.49 mA cm–2) under the same condition.
Moreover, the SERS signals of rhodamine 6G (R6G) on Ih Au are much
stronger than that on the other corresponding Au counterparts. Particularly,
the SERS intensity of R6G on Ih Au increases by about four times compared
to that on Au NPs. This study motivates the great prospect for combining
Ih Au’s bifunctionalities and indicates the potential of bifunctional
nanomaterials in biologically implanted devices.