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Carbon based dots capped tin oxide nanosheets (SnO2/CDs) were synthesized by liquid exfoliation of tin oxide (SnO2) nanoparticles in the presence of single-layer carbon based (CDs). The obtained SnO2/CDs have lateral sizes of about 20e50 nm and heights of about 3-4 nm. A thin layer of CDs of about 1-2 nm in thickness are presence on the surface of the SnO2 nanosheets. The SnO2/CDs present excellent surface enhanced Raman spectroscopy (SERS) activity due to the chemical enhancement (CM) led by the charge transfer between SnO2/CDs and the target molecules. The enhancement factor (EF) of the SnO2/CDs is 1.42 x 10(5), taking rhodamine 6G as a model target molecule. The SnO2/CDs are further hybridized with silver nanoparticles (AgNPs) using an in situ synthesis method. The obtained homogeneous nano-hybrids (SnO2/CDs@AgNPs) have a lot of nanogaps. The nanogaps among the AgNPs/CDs create strong electromagnetic enhancement (EM) due to the "hot spots" effect. The nanogaps among the SnO2/CDs and AgNPs/CDs allow the target molecules to be embedded, and thus gained both the CM effect of SnO2/CDs and the EM effect of AgNPs/CDs. As a result, the as-prepared SnO2/CDs@AgNPs exhibits excellent SERS activities, with an ultrahigh enhancement factor of 3.27 x 10(11). (C) 2020 Elsevier Ltd. All rights reserved.
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CARBON
ISSN: 0008-6223
Year: 2020
Volume: 170
Page: 270-276
9 . 5 9 4
JCR@2020
1 0 . 5 0 0
JCR@2023
ESI Discipline: CHEMISTRY;
ESI HC Threshold:160
JCR Journal Grade:1
CAS Journal Grade:2
Cited Count:
WoS CC Cited Count: 12
SCOPUS Cited Count: 11
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 2
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