Facile In-Situ photocatalytic reduction of AuNPs on multilayer Core-Shell Fe3O4@SiO2@PDA magnetic nanostructures and their SERS application

Wu, Panfeng; Sun, Xiaobing; Hao, Nana; Wang, Li; Huang, Jikun; Tang, Jianjiang

doi:10.1016/j.saa.2023.123101

Cited by 6 publications

(5 citation statements)

References 36 publications

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“…(a) EFRI provided by the optimal SERS substrate and the optimal SMC-SERS system with the 5 μm SiO 2 microsphere for various CV concentrations. A comparative survey of (b) enhanced factor and (c) detection limits for dye molecules over the past few years. ,,− ,− …”

Section: Resultsmentioning

confidence: 99%

Ultrasensitive Trace Detection of Dye Molecules Based on Scanning Microsphere-Coupled Surface-Enhanced Raman Spectroscopy

Rao,

Yang,

Yuan

et al. 2024

J. Phys. Chem. C

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Ultrasensitive detection of trace substances holds significant importance in chemical analysis and biochemical sensing. As an exceptionally robust spectroscopic technique, surface-enhanced Raman spectroscopy offers significant advantages in the trace detection of analytes on various plasmonic noble-metal substrates. The recent integration of plasmonic nanostructures with nonplasmonic microcavities has emerged as a promising approach to enhance the sensitivity of Raman detection further. In this work, we developed an ultrasensitive scanning microsphere-coupled surface-enhanced Raman spectroscopy system and applied it to detect trace dye molecules. We found that based on conventional surface-enhanced Raman substrates with Au nanostructure films, the enhancement factor of Raman intensity can reach the level of ∼109 through optimizing conditions. By incorporating a scanning silica dielectric microsphere, the Raman signals can be further enhanced by two orders of magnitude, resulting in an enhancement factor as high as ∼1011 and corresponding to a detection limit of 10–13 M for an aqueous crystal violet solution. Note that the detection limit reached the best performance ever recorded. The enhancement mechanism of dielectric microspheres is explained well by theoretical simulations. Additionally, our technique allows the spectroscopic imaging of trace analytes over a region, providing a facile strategy to fabricate hybrid Raman enhancers for ultrasensitive, highly efficient, and cost-effective sensing applications.

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Section: Resultsmentioning

confidence: 99%

Ultrasensitive Trace Detection of Dye Molecules Based on Scanning Microsphere-Coupled Surface-Enhanced Raman Spectroscopy

Rao,

Yang,

Yuan

et al. 2024

J. Phys. Chem. C

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“…Fe 3 O 4 @SiO 2 core-shell nanoparticles were prepared by the sol-gel process. [30][31][32] 1.0 g of the Fe 3 O 4 nanoparticle was taken and a solution was prepared in an ultrasonic bath using 0.500 L ethanol, 0.125 L H 2 O and 0.032 L NH 3 . 13.5 mL TEOS was added dropwise to the solution and stirred at room temperature for 3 hours in N 2 atmosphere.…”

Section: Preparation Of Fe 3 O 4 @Sio 2 Nanoparticlesmentioning

confidence: 99%

Preparation of Metal‐Containing Zwitterionic Fe₃O₄@SiO₂−βPDMA Composite Systems and Catalytic Activity Studies

Tuncer,

Yurdakul

2024

ChemistrySelect

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In response to the current challenges in the field, this study will contribute to the development of a highly versatile magnetic core/shell nanocomposite by addressing issues in the synthesis and functionalization of Fe3O4 nanoparticles through the presentation of innovative solutions. Firstly, Fe3O4 nanoparticles were synthesized. Tetraethyl orthosilicate was used as a silicon source and Fe3O4@SiO2 magnetic nanoparticles were synthesized. The outer surface of Fe3O4@SiO2 nanoparticles were modified and converted into Fe3O4@SiO2−NH2 structure. These modified particles were then functionalized with alkyl bromide to be used as an ATRP initiator and Fe3O4@SiO2−Br structure was obtained. The polymerization of 2‐(dimethylamino)ethyl methacrylate (DMA) monomer on the particle surface was achieved by the SI‐ATRP method. In the last step, betainization of Fe3O4@SiO2−PDMA composite was worked, and the salts of gold and silver were added to composite systems. The dispersions of the metal loaded Fe3O4@SiO2−βPDMA composite was obtained and used as catalysts in the reduction reaction of p‐nitrophenol to p‐aminophenol. Consequently, Fe3O4@SiO2−βPDMA composite system with magnetic properties in the range of 145–160 nm was prepared. The structure of synthesized magnetic nanoparticle was characterized by PXRD, TEM, TG‐DTA and the catalyst activity in the reduction reaction of p‐nitrophenol to p‐aminophenol was examined by UV‐vis spectrophotometer.

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“…Active sites are provided by large surface area magnetite nanospheres for a range of applications [Sirelkhatim et al 2015 ]. The breakdown of nanoparticles is prevented while simultaneously enhancing their biocompatibility by coating their surfaces with Stöber SiO 2 core-shelled with Fe 3 O 4 NPs [Wu et al 2023 ]. The Fe 3 O 4 @SiO 2 hybrid nanofillers combined the chemical composition and crystallinity of the two materials [Zhang et al 2016 ; Hui et al 2011 ].…”

Section: Hyperbranched Alkyd Nanocompositesmentioning

confidence: 99%

Durable graphene-based alkyd nanocomposites for surface coating applications

Selim,

El-hoshoudy,

Zaki

et al. 2024

Environ Sci Pollut Res

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Recently, the scientific community’s main goal is the long-term sustainability. Vegetable oils are easily accessible, non-depletable, and cost-effective materials. Vegetable oils are used to prepare polymeric alkyd surfaces. Novel and exciting designs of alkyd/graphene nanocomposites have provided eco-friendly thermal stability and protective coating surfaces. This review has briefly described important graphene-based alkyd nanocomposites along with their applications as protective coatings. These alkyd composites have high hydrophobicity, corrosion resistance, and durability. Graphene-based alkyd nanocoatings have many industrial and research interests because of their exceptional thermal and chemical properties. This work introduces an advanced horizon for developing protective nanocomposite coatings. The anti-corrosion properties and coatings’ longevity may be improved by combining the synergistic effects of hybrid nanofillers introduced in this work.

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Facile In-Situ photocatalytic reduction of AuNPs on multilayer Core-Shell Fe3O4@SiO2@PDA magnetic nanostructures and their SERS application

Cited by 6 publications

References 36 publications

Ultrasensitive Trace Detection of Dye Molecules Based on Scanning Microsphere-Coupled Surface-Enhanced Raman Spectroscopy

Ultrasensitive Trace Detection of Dye Molecules Based on Scanning Microsphere-Coupled Surface-Enhanced Raman Spectroscopy

Preparation of Metal‐Containing Zwitterionic Fe₃O₄@SiO₂−βPDMA Composite Systems and Catalytic Activity Studies

Durable graphene-based alkyd nanocomposites for surface coating applications

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Facile In-Situ photocatalytic reduction of AuNPs on multilayer Core-Shell Fe3O4@SiO2@PDA magnetic nanostructures and their SERS application

Cited by 6 publications

References 36 publications

Ultrasensitive Trace Detection of Dye Molecules Based on Scanning Microsphere-Coupled Surface-Enhanced Raman Spectroscopy

Ultrasensitive Trace Detection of Dye Molecules Based on Scanning Microsphere-Coupled Surface-Enhanced Raman Spectroscopy

Preparation of Metal‐Containing Zwitterionic Fe3O4@SiO2−βPDMA Composite Systems and Catalytic Activity Studies

Durable graphene-based alkyd nanocomposites for surface coating applications

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Preparation of Metal‐Containing Zwitterionic Fe₃O₄@SiO₂−βPDMA Composite Systems and Catalytic Activity Studies