Marangoni Effect-Driven Transfer and Compression at Three-Phase Interfaces for Highly Reproducible Nanoparticle Monolayers

Lin, Xiang; Fang, Guoqiang; Liu, Yuanlan; He, Yangyang; Wang, Li; Dong, Binbin

doi:10.1021/acs.jpclett.0c01116

Cited by 122 publications

(77 citation statements)

References 50 publications

(56 reference statements)

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“…The monolayer film of Au NPs was obtained by LLISA technique. [ 34 ] The Au NPs ethanol solution (200 µL) and CH 2 Cl 2 (800 µL) were mixed with water (2 mL). After shaking, n‐hexane was added and monolayer film was formed at the interface.…”

Section: Methodsmentioning

confidence: 99%

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From Dilute to Multiple Layers: Bottom‐Up Self‐Assembly of Rough Gold Nanorods as SERS Platform for Quantitative Detection of Thiram in Soil

Lin

et al. 2021

Adv Materials Inter

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The nanoparticle density (PD) of the substrates is crucial for surface‐enhanced Raman scattering (SERS) performance. Here, bottom‐up SERS substrates based on rough gold nanorods (R‐Au NRs) with different PD are fabricated and their SERS property are investigated. In particular, R‐Au NRs are deposited on the Si wafer from sparse to dense through electrostatic interaction and from monolayer to multiple layers by interface self‐assembly technique. It is found that the SERS intensity increases dramatically with increasing PD and remains almost unchanged when the PD increases to 241.22 counts µm−2, and the limited penetration depth of laser is the reason for the intensity saturation. Additionally, similar results are observed in the smooth Au NRs substrates, re‐confirming the PD‐dependent SERS performance. Importantly, the SERS activity of R‐Au NRs substrates is higher than smooth Au NRs substrates in each PD, indicating that R‐Au NRs can produce stronger electromagnetic field enhancement, which is supported by the theoretical simulation results. Finally, it is demonstrated that the optimal SERS substrates can be effectively utilized for the quantitative measurement of thiram in soil. Briefly, the PD of substrates has a great impact on SERS activity, which offers an idea for the design of highly efficient SERS substrates.

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Section: Methodsmentioning

confidence: 99%

“…[ 24–26 ] Among these techniques, bottom‐up self‐assembly is a simple, scalable, and low‐cost approach to achieve uniform and highly effective SERS substrates, such as droplet evaporation, [ 27–29 ] electrostatic interaction, [ 30,31 ] and interface self‐assembly. [ 32–37 ]…”

Section: Introductionmentioning

confidence: 99%

From Dilute to Multiple Layers: Bottom‐Up Self‐Assembly of Rough Gold Nanorods as SERS Platform for Quantitative Detection of Thiram in Soil

Lin

et al. 2021

Adv Materials Inter

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“…The high sensitivity of SERS is mainly due to the localized surface plasmon resonance (LSPR) of the SERS substrate. Various plasmonic composites were developed and used as SERS substrates [14][15][16][17][18][19][20][21]. The noble metal nanoparticle-functionalized PS microspheres have attracted considerable interest as SERS substrates due to their uniform micrometer size supporting well defined plasmonic nanoparticles on the surface.…”

Section: Introductionmentioning

confidence: 99%

Layer-by-Layer Assembly of Polystyrene/Ag for a Highly Reproducible SERS Substrate and Its Use for the Detection of Food Contaminants

Zhang

Guo

et al. 2021

Polymers

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Polystyrene (PS) spheres were prepared through an emulsifier-free emulsion polymerization method, in which the reaction time, ionic strength, concentrations of copolymer were studied in detail. The resulting PS microspheres and Ag nanoparticles were used to construct a surface enhanced Raman scattering (SERS) substrate by a layer-by-layer assembly method. A relatively uniform distribution of PS/Ag in the films was obtained, and the multilayer substrate presented excellent SERS reproducibility and a tunable enhancement effect. The SERS substrate was used for detecting harmful pesticides (malachite green and dimetridazole) in food samples, with a limit of detection as low as 3.5 ppb. The obtained plasmonic composite has a promising future in the field of SERS sensing.

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“…[9][10][11] When the SERS substrate interacts with electromagnetic waves, the local surface plasmons excited by the electromagnetic waves on the rough metal surface causes the electric field near the surface to amplify and produce hotspots, which increases the SERS signal intensity. 12,13 With the development of SERS technology, some scholars have used the preparation of functionalized SERS substrates to detect heavy metal ions. For example, Yang's research group prepared inositol hexaphosphate (IP6) as a stabilizer and surfacemodified crystal violet (CV) Au nanoparticles (Au NPs), by using trisodium citrate (TC) as a reducing agent to determine mercury ions in aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Detection of Soluble Mercury in Cinnabar Using a CV-Ag NPs SERS Probe

Han

Lin

et al. 2021

ANAL. SCI.

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In this paper, the uniform morphological Ag nanoparticles (Ag NPs) were prepared with ascorbic acid as the reducing agent and citrate as the stabilizer. The surface of Ag NPs modified by crystal violet (CV) and potassium iodide (KI) is used as the aggregation agent to obtain CV modified Ag NPs (CV-Ag NPs) probes for detecting mercury ions.The mercury ions can be reduced to mercury molecules by citrate, and then deposited them on the surface of Ag NPs, leading to the separation of CV molecules from the surface of Ag NPs. Therefore, the SERS signal intensity of CV decreases with the increase of Hg 2+ concentration and the concentration of Hg 2+ is in the range of 110 -11 to 110 -5 M. Taking the change of the characteristic peak intensity of CV at 913 cm -1 as a reference, the SERS spectrum intensity of CV has a linear relationship with the Hg 2+ concentration. The equation is y=-333.55*x+1343.05 with the linear correlation coefficient is R 2 =0.980, and the recovery rate is between 84.20% to 105.60%. Finally, the CV-Ag NPs probe was used to quickly detect the soluble mercury in cinnabar.Compared with the conventional large-scale instrument detection method, this simple and fast method, can be applied for the rapid detection of soluble mercury, and has a certain significance for the research of mineral medicine processing mechanism.

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Marangoni Effect-Driven Transfer and Compression at Three-Phase Interfaces for Highly Reproducible Nanoparticle Monolayers

Cited by 122 publications

References 50 publications

From Dilute to Multiple Layers: Bottom‐Up Self‐Assembly of Rough Gold Nanorods as SERS Platform for Quantitative Detection of Thiram in Soil

From Dilute to Multiple Layers: Bottom‐Up Self‐Assembly of Rough Gold Nanorods as SERS Platform for Quantitative Detection of Thiram in Soil

Layer-by-Layer Assembly of Polystyrene/Ag for a Highly Reproducible SERS Substrate and Its Use for the Detection of Food Contaminants

Detection of Soluble Mercury in Cinnabar Using a CV-Ag NPs SERS Probe

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