Controlled synthesis of Au-loaded Fe3O4@C composite microspheres with superior SERS detection and catalytic degradation abilities for organic dyes

Gan, Zibao; Zhao, Aiguo; Zhang, Maofeng; Wei, Tao; Guo, Hongyan; Gao, Qian; Mao, Ranran; Liu, Erhu

doi:10.1039/c3dt50341k

Cited by 110 publications

(38 citation statements)

References 48 publications

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“…Zhang et al successfully synthesized Fe 3 O 4 \SiO 2 \Ag composite and investigated its potential application as an antibacterial material in water disinfection (Zhang et al 2011). Gan et al had developed Fe 3 O 4 @C@Au composite microspheres with superior SERS detection and recyclable catalytic degradation abilities for organic dyes (Gan et al 2013). Therefore, the synthesis of multifarious magnetic nanocomposites with multiple properties arouses more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of cube-like Fe3O4@SiO2@Ag nanocomposites with high SERS activity and their application in pesticide detection

Zhao

Wang

et al. 2016

J Nanopart Res

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The cube-like Fe 3 O 4 @SiO 2 @Ag (FSA) nanocomposites with great SERS activity have been successfully synthesized by a layer-by-layer procedure in this paper. The cube-like Fe 3 O 4 @SiO 2 coreshell structures were prepared via a new route and Ag nanoparticles were introduced onto their surface through a one-pot hydrothermal reaction. By controlling the reaction time, the coverage rate of Ag on the FSA surface could be tuned, and then a series of FSA composites were obtained. The SERS properties of these FSA composites were investigated using paminothiophenol (p-ATP) as the probe molecule. It was found that the FSA composites synthesized with a reaction time of 6 h showed the best SERS performance, and the detection limit for p-ATP could reach 1 9 10 -7 M. For practical application, the FSA composites were also used to detect thiram, one of the dithiocarbamate fungicides that has been widely used as a pesticide in agriculture. The detection limit is as low as 1 9 10 -6 M (0.24 ppm), lower than the maximal residue limit of 7 ppm in fruit prescribed by the US Environmental Protection Agency. The resulting substrate with high SERS activity, stability and strong magnetic responsivity makes the FSA composite a perfect choice for practical SERS detection applications.

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Section: Introductionmentioning

confidence: 99%

Fabrication of cube-like Fe3O4@SiO2@Ag nanocomposites with high SERS activity and their application in pesticide detection

Zhao

Wang

et al. 2016

J Nanopart Res

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“…Additionally, the polyelectrolyte PDDA that acts as a linker in the assembly of Ag@C SHINs can minimize the background of the SERS spectra, [41][42][43] owing to its small Raman crosssection. Briefl y, negatively charged Fe 3 O 4 @C and Ag@C SHINs were synthesized separately using one-pot solvothermal methods.…”

Section: Resultsmentioning

confidence: 99%

Plasmonic Core/Satellite Heterostructure with Hierarchical Nanogaps for Raman Spectroscopy Enhanced by Shell‐Isolated Nanoparticles

Cheng

Jin

et al. 2014

Advanced Optical Materials

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Au and Ag nanoparticles coated with an ultrathin inert shell to act as tips that are similar to the tips used in a TERS system; this new system was named shell-isolatednanoparticle-enhanced Raman spectroscopy (SHINERS). [17][18][19][20][21] When shell-isolated nanoparticles (SHINs) were spread on a solid substrate such as Au (111), the nanoscale gaps formed in the regions between nanoparticles generated strong electromagnetic fi elds under laser excitation, providing intense SERS enhancement. The enhanced Raman signals from the SHINs were as strong as a combined signal resulting from thousands of TERS tips. As a result, SHINERS is capable of detecting metal-H bonds and other molecular species on the non-SERS-active substrates, such as Au(111), Pt(111), Cu(111), and Rh(111) single-crystalline surfaces. [ 2,[22][23][24][25][26][27][28][29][30][31][32][33][34] Nevertheless, it is still challenging to obtain high-quality Raman spectra from liquid-phase samples on nonmetallic surfaces for ultrasensitive detection due to the limited enhancement from shell-isolated Au nanoparticles.Recently, plasmonic core/satellite structures as a new type of nanostructure have attracted a great deal of attention because of the strong plasmonic coupling formed between satellite nanoparticles. [35][36][37][38][39][40] This coupling signifi cantly enhances the electromagnetic fi elds within high-density nanogaps, and numerous hot spots are achieved for surface-enhanced spectroscopy. Consequently, the strategy of core/satellite structures containing SHINs offers a new path toward strong Raman enhancement of SHINERS.In this work, we designed a plasmonic core/satellite heterostructure with hierarchical nanogaps. Satellite Ag nanoparticles with an inert C shell (Ag@C SHINs) are densely electrostatically assembled on a high-refractive-index dielectric core nanoparticle using a polyelectrolyte linker; the core consists of a C-coated Fe 3 O 4 particle (Fe 3 O 4 @C). We investigated the structure and plasmonics of the core/satellite heterostructure. Their SERS activities in various systems were also examined to understand the infl uence of the hierarchical nanogaps-that is, the nanogaps between SHIN pairs (SHIN-SHIN), between the heterostructure and the substrate, and between SHINs and the core particles. The core/satellite heterostructure demonstrated excellent SERS activity and great potential in trace-amount detection. This work offers a new strategy for developing SHINs to improve the performance of SHINERS.A plasmonic core/satellite heterostructure is synthesized through an electrostatic self-assembly protocol. The heterostructure comprises C-coated Ag nanoparticles known as Ag@C shell-isolated nanoparticles (SHINs) acting as satellite particles and a C-coated Fe 3 O 4 dielectric particle core (Fe 3 O 4 @C). The enhanced electromagnetic fi eld generated from the hierarchical nanoscale gaps found among the particles makes high-quality Raman spectra possible. As a result, shell-isolated-nanoparticle-enhanced Raman spectroscopy (SHINERS) based...

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“…S4, Supporting information). In the context of this work, it was found as particularly useful because it is well‐known to adsorb strongly to textiles such as cotton, wool and silk and on the other side several Raman studies have reported a strong SERS signal when it is used as the analyte …”

Section: Surface Enhanced Raman Scattering Studies Using Ag/linen Nanmentioning

confidence: 99%

SERS and Raman imaging as a new tool to monitor dyeing on textile fibres

Fateixa

Wilhelm

Nogueira

et al. 2016

J. Raman Spectrosc.

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Textile fibres containing Ag nanoparticles have been widely explored for a number of antimicrobial fabrics. Moreover, it is well-known that textile dyeing is a critical stage in the manufacture thereof. This research shows that surface enhanced Raman scattering (SERS) and Raman imaging can be used with advantage in the monitoring of this process. Using Ag containing linen fibres stained with methylene blue (MB), it was possible to map the local distribution of the MB dye in the fibres by Raman imaging. MB was selected as the SERS molecular probe and as a model dye. Composites of linen fibres and Ag nanoparticles were prepared by distinct methods and used as SERS substrates in order to evaluate the effect of the preparative method on the Raman images. Our results demonstrate that by using Raman imaging associated to the presence of Ag nanoparticles, it is possible to distinguish the local distribution of the dye on the textile surface. This investigation allows to foreseeing the use of this technique in terms of quality control of Ag containing fabrics, which is a market in great expansion.

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Controlled synthesis of Au-loaded Fe3O4@C composite microspheres with superior SERS detection and catalytic degradation abilities for organic dyes

Cited by 110 publications

References 48 publications

Fabrication of cube-like Fe3O4@SiO2@Ag nanocomposites with high SERS activity and their application in pesticide detection

Fabrication of cube-like Fe3O4@SiO2@Ag nanocomposites with high SERS activity and their application in pesticide detection

Plasmonic Core/Satellite Heterostructure with Hierarchical Nanogaps for Raman Spectroscopy Enhanced by Shell‐Isolated Nanoparticles

SERS and Raman imaging as a new tool to monitor dyeing on textile fibres

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