Afterglow-Assistant Surface-Enhanced Raman Scattering on Cr3+:ZnGa2O4@Au
2020
Surface-enhanced
Raman scattering (SERS) has been widely investigated
in recent years. The subtle design and synthesis of SERS substrates,
including the semiconductor–metal composites, are the key but
difficult points. To date, only the short-lived semiconductors are
involved, and no research has been conducted concerning the long-lived
ones although the persistent luminescence semiconductors have great
potential of charge transfer in relatively long durations. Herein,
we present a concept of afterglow-assistant SERS (AASERS) on the long-lived
gold shell-capped Cr3+-doped ZnGa2O4 (CZGO@Au) substrate. The normal SERS, AASERS acquired immediately
after 2 min illuminating of a 633 nm laser, AA-1 min SERS acquired
1 min after 2 min illuminating of a 633 nm of the typical analytes
on CZGO@Au, ZnGa2O4@Au (ZGO@Au), and gold nanostars
(GNSs) with the same UV–vis absorption wavelength are systematically
compared. The CZGO@Au owns the SERS signals that are 1.8 times of
ZGO@Au and 3.4 times of GNSs. A higher AASERS than the corresponding
SERS (1.65 times) is only observed on CZGO@Au, and the AASERS on CZGO@Au
is 2.8 times of that on ZGO@Au and 5.2 times of that on GNSs. Because
of the afterglow decay of CZGO@Au, the AA-1 min SERS on CZGO@Au returns
to its SERS. These data demonstrate that the AASERS on long-lived
substrates is a promising way for further enhancing SERS signals just
by laser illuminating the substrates, and thus affords alternatives
for reducing the difficulties in the complicated synthesis of the
exquisite substrates. The AASERS mechanism and the application of
CZGO@Au in SERS imaging of living U87MG cells are also discussed.
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