Facile synthesis of AgPt@Ag core-shell nanoparticles as highly active surface-enhanced Raman scattering substrates

Zhu, Xiaoyan; Wang, Ai‐Jun; Chen, Saisai; Liu, Xiang; Feng, Jiu‐Ju

doi:10.1016/j.snb.2017.12.185

Cited by 26 publications

(7 citation statements)

References 54 publications

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“…A 10-μL reference sample with 10 −5 mol/L R6G deposited on a glass slide was measured. The constructive Raman band at 1512 cm −1 was selected to estimate the SERS enhancement factor (EF) based on the following Equation 1 [ 39 ]: EF = ( I SERS / N NR )/( I NR / N SERS ） where I SERS is the SERS intensity of R6G on PS PCs and I NR is the normal Raman intensity of R6G at the same band. N NR and N SERS represent the corresponding numbers of molecules in the focused incident beam on the substrate, which can be estimated using a reported method [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

Zhong

Guo

et al. 2018

Nanomaterials

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Picric acid (PA) is an organic substance widely used in industry and military, which poses a great threat to the environment and security due to its unstable, toxic, and explosive properties. Trace detection of PA is also a challenging task because of its highly acidic and anionic character. In this work, silver nanoparticles (AgNPs)-decorated porous silicon photonic crystals (PS PCs) were controllably prepared as surface-enhanced Raman scattering (SERS) substrates using the immersion plating solution. PA and Rhodamine 6G dye (R6G) were used as the analyte to explore the detection performance. As compared with single layer porous silicon, the enhancement factor of PS PCs substrates is increased to 3.58 times at the concentration of 10−6 mol/L (R6G). This additional enhancement was greatly beneficial to the trace-amount-detection of target molecules. Under the optimized assay condition, the platform shows a distinguished sensitivity with the limit of detection of PA as low as 10−8 mol/L, the linear range from 10−4 to 10−7 mol/L, and a decent reproducibility with a relative standard deviation (RSD) of ca. 8%. These results show that the AgNPs-modified PS PCs substrates could also find further applications in biomedical and environmental sensing.

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Section: Resultsmentioning

confidence: 99%

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

Zhong

Guo

et al. 2018

Nanomaterials

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“…Recently, because of the synergetic functions between different kinds of noble metals, varying bimetal nanoparticles have been prepared for SERS. − To prepare bimetal nanostructures with various shapes and sizes, seed-mediated method, deposition–precipitation, galvanic replacement, coprecipitation, and templated growth have all been implemented previously. For instance, by simultaneous reduction of HAuCl 4 and H 2 PdCl 4 with ascorbic acid, gold–palladium alloy in a neuron-like shape was prepared under the stabilizing and structure-directing influence of N -methylimidazole .…”

Section: Introductionmentioning

confidence: 99%

Green and Controllable Synthesis of Au–Ag Bimetal Nanoparticles by Xylan for Surface-Enhanced Raman Scattering

Cai

Liu

et al. 2019

ACS Sustainable Chem. Eng.

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In surface-enhanced Raman scattering, Ag nanoparticles are broadly employed. However, their lack of oxidation resistance means that their performance diminishes and is difficult to repeat. In this study, with addition of xylan, Au–Ag core–shell and alloy nanoparticles were prepared. Besides functioning as a reducing and stabilizing agent for Au–Ag bimetal nanoparticles, xylan protected them from oxidation and aggregation and created hot spots between interconnected nanoparticles. By seed-mediated methods, Au–Ag hollow alloy and Au@Ag core–shell nanoparticles with different shell thicknesses were prepared. More spherical and larger core–shell nanoparticles were prepared by an optimized dosage of xylan without the generation of excess Ag nanoparticles. Furthermore, the Au@Ag nanoparticles showed enhanced stability against oxidation and corrosion by H2O2 with the packing of xylan. The Raman enhancement performance of xylan-capped Au@Ag nanoparticles with optimized shell thickness to 4-mercaptobenzoic acid was better than that of Au–Ag alloy, neat Au and Ag nanoparticles. The Au@Ag nanoparticles could detect 4-mercaptobenzoic acid with a greater sensitivity and its limit of detection was 1 nM. Moreover, xylan-capped Au@Ag nanoparticles could detect food contaminant like Sudan I with a limit of detection as low as 0.126 ppm. Therefore, this work not only offers a new method for high-value utilization of xylan but also presents a simple, green, and ultrasensitive surface detection technique for the assessment of food/environmental safety.

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Section: Nanomaterials For Sensingmentioning

confidence: 99%

“…The TEM and STEM images of the bimetallic Au/Ag core–shell superstructures (Figure c,f) and the corresponding high‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) elemental mapping data are shown in (Figure d,e). In other work, a bimetallic alloy of Ag/Pt was used as the core material combined with a Ag nanoparticle shell for the SERS detection of 4‐mercaptopyridine (4‐MCP) providing a limit of detection of 0.008 × 10 −6 m , and Cu‐coated Au nanoparticles prepared on an indium tin oxide (ITO) substrate have shown excellent SERS enhancement although the preparation method was found to be very cumbersome . It is well known that Ag nanoparticles are unstable under ambient conditions and tend to oxidize in acidic environments, and the aggregation of Ag and Au nanoparticles in salt solutions leads to precipitation that affects their plasmonic properties during operation.…”

Section: Nanomaterials For Sensingmentioning

confidence: 99%

Recent Advances in 2D Inorganic Nanomaterials for SERS Sensing

et al. 2019

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Surface‐enhanced Raman spectroscopy is a powerful and sensitive analytical tool that has found application in chemical and biomolecule analysis and environmental monitoring. Since its discovery in the early 1970s, a variety of materials ranging from noble metals to nanostructured materials have been employed as surface enhanced Raman scattering (SERS) substrates. In recent years, 2D inorganic materials have found wide use in the development of SERS‐based chemical sensors owing to their unique thickness dependent physico‐chemical properties with enhanced chemical‐based charge‐transfer processes. Here, recent advances in the application of various 2D inorganic nanomaterials, including graphene, boron nitride, semiconducting metal oxides, and transition metal chalcogenides, in chemical detection via SERS are presented. The background of the SERS concept, including its basic theory and sensing mechanism, along with the salient features of different nanomaterials used as substrates in SERS, extending from monometallic nanoparticles to nanometal oxides, is comprehensively discussed. The importance of 2D inorganic nanomaterials in SERS enhancement, along with their application toward chemical detection, is explained in detail with suitable examples and illustrations. In conclusion, some guidelines are presented for the development of this promising field in the future.

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Facile synthesis of AgPt@Ag core-shell nanoparticles as highly active surface-enhanced Raman scattering substrates

Cited by 26 publications

References 54 publications

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

Green and Controllable Synthesis of Au–Ag Bimetal Nanoparticles by Xylan for Surface-Enhanced Raman Scattering

Recent Advances in 2D Inorganic Nanomaterials for SERS Sensing

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