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E u r o S c i C o n C o n f e r e n c e o n
Chemistry
2018
Chemistry 2018
Journal of Organic & Inorganic Chemistry
ISSN 2472-1123
F e b r u a r y 1 9 - 2 0 , 2 0 1 8
P a r i s , F r a n c e
Page 70
S
urface enhanced Raman scattering (SERS), benefitted
by its fingerprinting ability of molecules can be a
reliable option for trace analysis in the food matrix. Since
the sensitivity of a SERS method is highly dependent on the
degree, to which the Raman signature is enhanced, fabrication
substrate that could adequately amplify the local field
through excitation of localized surface plasmon resonances
(LSPRs) is critical. Hence, control over the nanostructures
morphology and improving their inter-particle distance is
important for obtaining improved SERS activity. In addition,
flexible platforms like paper offer the means for improving
Hybrid flexible
plasmonic SERS
substrate with
improved assemblage
of Ag@SiO
2
nanocubes
on a miniaturized
paper platform for
detection of melamine
Menbere Leul Mekonnen
1
,
Wei-Nien Su
2
, Ching-Hsiang
Chen
2
and Bing-Joe Hwang
1,2
1
National Taiwan University of Science and
Technology, Taiwan
2
National Synchrotron Radiation Research
Center, Taiwan
the nanostructures assemblage with ease of fabrication at
low cost and improved sample collection efficiency. Here in,
inexpensive, flexible paper-plasmonic hybrid SERS substrate
is presented by loading Ag@SiO
2
nanocubes on a miniaturized
filter paper through vacuum filtration. The miniaturized
sensing platform owes a reasonable distribution and inter-
particle spacing of nanocubes. The fibrous structure of paper
promotes the assemblage of sharp-edged nanostructures which
significantly improve their distribution and SERS activity.The
thin silica shell improved the stability and inter-particle spacing
of silver nanocubes in the sensing platform, rendering enhanced
SERS activity through plasmon-coupling effect as compared
to a conventional rigid substrate. Assessment of analytical
performances of the substrate for melamine quantification
showed a good linearity (R
2
=0.9947) up to 1 mg/L with a limit of
detection 0.06 mg/L. The detection limit in liquid milk was down
to 0.17 mg/L, which is below the permissible level.
menberelm@gmail.comJ Org Inorg Chem 2018, Volume: 4
DOI: 10.21767/2472-1123-C1-003