A Novel Molecularly Imprinted Sensor for Direct Tartrazine Detection

Jiang, Shuhai; Xu, Jinfeng; Xu, Peidong; Liu, Lijuan; Chen, Yi; Qiao, Changsheng; Yang, Shufeng; Zhou, Sha; Zhang, Juankun

doi:10.1080/00032719.2013.834442

Cited by 26 publications

(1 citation statement)

References 15 publications

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“…The motivation for our study was to fabricate multifunctional magnetic satellite-structured Fe 3 O 4 @SiO 2 –Au (FA) substrates with tunable Au NP gaps for active capture and charge selective SERS analysis of food dyes. Layer-by-layer (LBL) assembly is known as a highly versatile method for the fabrication of layered structures from various components in a simple, inexpensive, and rapid procedure. − It has been used to assemble various materials, including NPs, cells, nanotubes, proteins, DNA, and RNA. Thus, this flexible LBL assembly approach is promising for the preparation and functionalization of materials, such as magnetic core–satellite structures.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Fe₃O₄@SiO₂–Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes

Sun

et al. 2016

ACS Appl. Mater. Interfaces

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Nanofabrication of multifunctional surface-enhanced Raman scattering (SERS) substrates is strongly desirable but currently remains a challenge. The motivation of this study was to design such a substrate, a versatile core−satellite Fe 3 O 4 @SiO 2 −Au (FA) hetero-nanostructure, and demonstrate its use for chargeselective detection of food dye molecules as an exemplary application. Our experimental results and three-dimensional finite difference time domain (FDTD) simulation suggest that tuning the Au nanoparticle (NP) gap to sub-10 nm, which could be readily accomplished, substantially enhanced the Raman signals. Further layer-by-layer deposition of a charged polyelectrolyte on this magnetic SERS substrate induced active adsorption and selective detection of food dye molecules of opposite charge on the substrates. Molecular dynamics (MD) simulations suggest that the selective SERS enhancement could be attributed to the high affinity and close contact (within a 20 Å range) between the substrate and molecules. Density function theory (DFT) calculations confirm the charge transfer from food dye molecules to Au NPs via the polyelectrolytes. This multifunctional SERS platform provides easy separation and selective detection of charged molecules from complex chemical mixtures.

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