Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 5, Issue 6, Pages 1402-1408Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc04579k
Keywords
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Funding
- National Key Basic Research Program of China [2013CB934304]
- Natural Science Foundation of China [51632009, 51628202, 51472245]
- SRG-HSC
- CAS/SAFEA International Partnership Program for Creative Research Teams
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For surface-enhanced Raman scattering (SERS)-based detection, it is desirable that the SERS substrates should not only have high SERS sensitivity, but also remarkable SERS-signal reproducibility and a good affinity for the target analytes. Herein, we report large-area membranes of plasmonic Ag-nanocubes (Ag-NCs) embedded in cellulose acetate (CA) microspheres (MSs) (denoted as Ag-NCs@CA-MSs), achieved by the electrospray technique, as highly sensitive and extremely homogeneous SERS substrates with good capture ability for analyte molecules in an aqueous solution. As a result, p-aminothiophenol (a probe molecule) and methyl parathion (a toxic pesticide) with concentrations down to 10(-9) M and 10(-7) M could be detected, respectively. Importantly, the membranes showed remarkable SERS-signal homogeneity over a large area, with a relative signal deviation down to 2.8% in a 500 x 500 mu m(2) area and 9.6% for the whole substrate (5 x 5 mm(2)). Moreover, Langmuir nonlinear fitting of the Raman intensity against the methyl parathion concentration was achieved, with a double-reciprocal plot of the Raman peak intensity versus the concentration showing a good linear relationship, making it possible for the quantitative SERS-based detection. Therefore, the Ag-NCs@CA-MS membranes showed potential for the quantitative SERS-based analysis of organic pollutants in the aqueous solution.
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