- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
An integrated approach for trace detection of pollutants in water using polyelectrolyte functionalized magneto-plasmonic nanosorbents
摘要： Resistance of pathogenic micro-organisms to conventional antibiotics is an essential issue for public health. the presence of such pharmaceuticals in aquatic ecosystems has been of major concern for which remediation and ultra-sensitive monitoring methods have been proposed. A less explored strategy involves the application of multifunctional nanosorbents for the uptake and subsequent detection of vestigial contaminants. in this study, colloidal nanoparticles (nps) of iron oxide and gold were encapsulated in multi-layers of a charged polyelectrolyte (pei: polyethyleneimine), envisaging the effective capture of tetracycline (TC) and its subsequent detection by Surface Enhanced Raman Scattering (SeRS). Adsorption studies were performed by varying operational parameters, such as the solution pH and contact time, in order to evaluate the performance of the nanosorbents for the uptake of tc from water. While the magnetic nanosorbents with an external pei layer (fe3o4@pei and fe3o4@PEI-Au@PEI particles) have shown better uptake efficiency for TC, these materials showed less SERS sensitivity than the fe3o4@pei- Au nanosorbents, whose SeRS sensitivity for tc in water has reached the limit of detection of 10 nM. Thus, this study highlights the potential of such magneto-plasmonic nanosorbents as multi-functional platforms for targeting specific contaminants in water, by taking into consideration both functionalities investigated: the removal by adsorption and the SeRS detection across the nanosorbents’ surfaces.
关键词： tetracycline,SERS detection,water pollutants,adsorption,magneto-plasmonic nanosorbents
更新于2025-09-16 10:30:52
-
Au-nanorod-clusters patterned optical fiber SERS probes fabricated by laser-induced evaporation self-assembly method
摘要： Optical ?ber surface-enhanced Raman scattering (SERS) probes provide a novel platform for liquid-phase in situ and remote SERS detections. However, it is still a challenge to fabricate noble metal nanostructures with large SERS enhancement factor (EF) onto optical ?ber surfaces. In this article, we successfully prepare Au-nanorod cluster structures on optical ?ber facets by a laboratory-developed laser-induced evaporation self-assembly method. It is demonstrated that the optimized optical ?ber SERS probes show high detection sensitivity (10?10 M for rhodamine 6G solution, and 10?8 M for malachite green or crystal violet solution) and excellent reproducibility (relative standard deviation less than 6%). As the laser-induced evaporation self-assembly method is a simple and low-cost method capable of achieving automatic and reproducible preparations of cluster patterned optical ?ber SERS probes, this work may ?nd important application prospects in various liquid-phase SERS detection areas.
关键词： Au-nanorod clusters,liquid-phase in situ detection,laser-induced evaporation self-assembly,SERS,optical fiber
更新于2025-09-16 10:30:52
-
The Role Played by Graphene Oxide in the Photodeposition and SERS Activity of Plasmonic Ag Nanoparticles Substrates
摘要： Ag nanoparticles substrates deposited by a photocatalytic method display SERS activity for rhodamine B, which is enhanced further by the fluorescence quenching promoted by graphene oxide.
关键词： SERS effect,rhodamine B,graphene oxide,Ag nanoparticles,photodeposition
更新于2025-09-16 10:30:52
-
Plasmonic Nanoassemblies: Tentacles Beat Satellites for Boosting Broadband NIR Plasmon Coupling Providing a Novel Candidate for SERS and Photothermal Therapy
摘要： Optical theranostic applications demand near-infrared (NIR) localized surface plasmon resonance (LSPR) and maximized electric field at nano-surfaces and nanojunctions, aiding diagnosis via Raman or optoacoustic imaging, and photothermal-based therapies. To this end, multiple permutations and combinations of plasmonic nanostructures and molecular “glues” or linkers are employed to obtain nanoassemblies, such as nano-branches and core–satellite morphologies. An advanced nanoassembly morphology comprising multiple linear tentacles anchored onto a spherical core is reported here. Importantly, this core-multi-tentacle-nanoassembly (CMT) benefits from numerous plasmonic interactions between multiple 5 nm gold nanoparticles (NPs) forming each tentacle as well as tentacle to core (15 nm) coupling. This results in an intense LSPR across the “biological optical window” of 650?1100 nm. It is shown that the combined interactions are responsible for the broadband LSPR and the intense electric field, otherwise not achievable with core–satellite morphologies. Further the sub 80 nm CMTs boosted NIR-surface-enhanced Raman scattering (SERS), with detection of SERS labels at 47 × 10-9 m, as well as lower toxicity to noncancerous cell lines (human fibroblast Wi38) than observed for cancerous cell lines (human breast cancer MCF7), presents itself as an attractive candidate for use as biomedical theranostics agents.
关键词： branched polymers,core–satellites,surface-enhanced Raman scattering (SERS),plasmonic nanoassemblies,broadband NIR absorbance,cell toxicity
更新于2025-09-16 10:30:52
-
A review of 2D and 3D plasmonic nanostructure array patterns: fabrication, light management and sensing applications
摘要： This review article discusses progress in surface plasmon resonance (SPR) of two-dimensional (2D) and three-dimensional (3D) chip-based nanostructure array patterns. Recent advancements in fabrication techniques for nano-arrays have endowed researchers with tools to explore a material’s plasmonic optical properties. In this review, fabrication techniques including electron-beam lithography, focused-ion lithography, dip-pen lithography, laser interference lithography, nanosphere lithography, nanoimprint lithography, and anodic aluminum oxide (AAO) template-based lithography are introduced and discussed. Nano-arrays have gained increased attention because of their optical property dependency (light-matter interactions) on size, shape, and periodicity. In particular, nano-array architectures can be tailored to produce and tune plasmonic modes such as localized surface plasmon resonance (LSPR), surface plasmon polariton (SPP), extraordinary transmission, surface lattice resonance (SLR), Fano resonance, plasmonic whispering-gallery modes (WGMs), and plasmonic gap mode. Thus, light management (absorption, scattering, transmission, and guided wave propagation), as well as electromagnetic (EM) field enhancement, can be controlled by rational design and fabrication of plasmonic nano-arrays. Because of their optical properties, these plasmonic modes can be utilized for designing plasmonic sensors and surface-enhanced Raman scattering (SERS) sensors.
关键词： sensor,lithography,nanofabrication,nano-array,plasmon,surface-enhanced Raman scattering (SERS),nanostructures
更新于2025-09-16 10:30:52
-
Highly enhanced Raman scattering with good reproducibility observed on a flexible PI nanofabric substrate decorated by silver nanoparticles with controlled size
摘要： Surface-enhanced Raman scattering (SERS) spectroscopy is considered as a highly powerful analytical tool for environmental contaminants monitoring, detection of bio/chemical warfare agents, explosive detection and biological sensing. In this study, silver nanoparticles (Ag NPs) decorated polyimide (PI) nanofabric was successfully prepared as an active flexible substrate for SERS. Without any surface modification and activation, this Ag@PI nanofabric SERS substrate was prepared via an integrated process of electrospinning and ion exchange-in situ reduction. ATR-FTIR, ICP, XRD, SEM, and TGA were used to investigate the influencing factors during preparation. p-Aminothiophenol (p-ATP) was used as the probe molecule to characterize the SERS performance of Ag@PI nanofabric substrate. As a result, this Ag@PI nanofabric exhibits remarkable enhancement effect (EF = 9.0 × 103), good reproducibility, ultra-low detection limit (10?14 mol/L), and a good linear relationship between the concentration of p-ATP and intensity of its characteristic peak, making it a desirable candidate as the SERS substrate.
关键词： Nanofiber,Polyimide,Substrate,SERS,Silver nanoparticle
更新于2025-09-16 10:30:52
-
3D structured laser engraves decorated with gold nanoparticle SERS chips for Paraquat herbicide detection in environments
摘要： Fabrication of SERS-active substrates is a thrust area of research in the field of SERS. Here, we report the fabrication of a new SERS-active substrate composed of Au nanostructures grown on aluminum sheets marked with laser lines (L-Mark SERS chips). The SERS activity of these SERS chips exploited with environmentally important herbicide, paraquat, and dye molecule of methylene blue. Density functional theory (DFT) calculation was performed to theoretically study the molecular structure and Raman vibrational modes of the paraquat. A detailed discussion has been devoted to uniformity, reproducibility, and practical utility of the fabricated substrates. Especially, great amount of discussion has been given to paraquat detection in soil extracts. The results emanate the ultra-sensitive detection of paraquat, uniform enhanced signals over the substrates, and high reproducibility. The report successfully demonstrated the detection of paraquat in drinking water, tap water, agri-water, environmental water, and soil extracts. Liquid chromatography-mass spectrometry (LC-MS) measurements were also performed to demonstrate the realiability of the SERS method. The L-Mark SERS chips based paraquat detection is simple, rapid, and sensitive. We propose that the present sensors hold the potential to be used in herbicide detection and monitoring in-the-field experiments.
关键词： Au nanostructures,SERS,DFT,L-Mark SERS chips,Paraquat,LC-MS
更新于2025-09-12 10:27:22
-
Determination of prostate cancer marker Zn2+ with a highly selective surface-enhanced Raman scattering probe on liquid–liquid self-assembled Au nanoarrays
摘要： As the concentration of Zn2+ in patients with prostate cancer is much less than that in healthy persons, Zn2+ concentration can be used as a marker to expediently screen prostate cancer. In this study, a sensitive and highly selective surface-enhanced Raman scattering (SERS) method to detect Zn2+ concentration in human prostatic fluids by utilizing water-insoluble 2-carboxyl-2′-hydroxyl-5′-sulfoformazylbenze (Zincon) as a SERS probe based on self-assembled Au nanoarrays at a liquid–liquid interface between n-hexane and Au colloids was proposed. Zincon showed remarkably different SERS bands before and after coordinating Zn2+ in the controlled conditions (70 μL of ethanol, 500 μL of n-hexane, pH value of 7.1 and 10 s of vortex mixing time), which can be used in quantifying Zn2+ with characteristic peaks. The proposed SERS method presented a good linear relationship ranging from 0.5 to 10 μmol/L and a satisfactory detection limit of 0.1 μmol/L as well as low interference with other metal ions. Moreover, the detection results are close to those of the conventional standard atomic absorption spectroscopy (AAS) method.
关键词： SERS,Au nanoarray,Zincon,Zn2+,Liquid-liquid self-assembly,Prostate cancer
更新于2025-09-12 10:27:22
-
Design of a Plasmonic Platform to Improve the SERS Sensitivity for Molecular Detection
摘要： We suggested a plasmonic platform based on a cubic pattern of gold spheres for surface enhanced Raman spectroscopy (SERS). In the case of linear polarization along the symmetry axes, the SERS enhancement per area is identical to hexagonally patterned surfaces. The validity of this model was tested using the simulation package of COMSOL Multiphysics? Modeling Software. We found an improved sensitivity in the near infrared and visible region of the electromagnetic spectrum. This method considered tolerance towards stacking faults and suggested a plasmonic platform for ultra-sensing applications. The design can be extended towards the molecular detection if the proposed plasmonic platform is used with SERS.
关键词： sensitivity,SERS enhancement,Plasmonic platform,finite element method
更新于2025-09-12 10:27:22
-
[IEEE 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP) - Zatoka, Ukraine (2018.9.9-2018.9.14)] 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP) - The Problem of Optimal Plasmonic Nanostructures Choice for SERS Applications
摘要： Nanostructures research plays a crucial role in the transformation of breakthrough scientific ideas into next-generation technology. In the way that silicon revolutionized the microelectronics industry, plasmonic nanostructures can greatly impact on the field of analytical instruments for molecular analysis of materials, even biological objects. Currently, research in the plasmonics has been faced the problem of choosing the optimal plasmonic nanostructures in order to realize useful devices. Usually, metal components such as gold, silver and copper serve for working elements of plasmon-active surfaces, which have a number of advantages in comparison with other materials. However, on the stage of devises design, the choice even between three different metals causes great difficulties. In order to take the first steps to solve this problem, here we consider the criteria for plasmon-active metals choice, and also give examples of Au, Ag, and Cu nanostructures obtained by the controlled self-assembly in limited pore volume of the SiO2/Si template for SERS applications.
关键词： SERS,Ag,template synthesis,Au,plasmonic nanostructures,Cu,ion track technology
更新于2025-09-12 10:27:22