Manipulating Bimetallic Nanostructures With Tunable Localized Surface Plasmon Resonance and Their Applications for Sensing

Min, Yuanhong; Wang, Yi

doi:10.3389/fchem.2020.00411

Cited by 31 publications

(18 citation statements)

References 128 publications

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“…Since a higher physical RI sensitivity naturally means a higher molecular sensitivity as well, recent efforts in LSPR sensor development generally aim to increase and maximize RIS and FOM to reach an ultralow limit of detection (LOD) [ 15 ]. This is done by controlling the size, shape [ 16 ], composition (e.g., bimetallic [ 17 ] or core-shell structures [ 18 ]), and arrangement [ 19 ] of the particles. These factors elaborately interact with each other; thus, there are many strategies to improve the RIS of a plasmonic sensor (for a review on the topic, see [ 20 ]).…”

Section: Introductionmentioning

confidence: 99%

Maximizing the Surface Sensitivity of LSPR Biosensors through Plasmon Coupling—Interparticle Gap Optimization for Dimers Using Computational Simulations

Bonyár

2021

Biosensors

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The bulk and surface refractive index sensitivities of LSPR biosensors, consisting of coupled plasmonic nanosphere and nano-ellipsoid dimers, were investigated by simulations using the boundary element method (BEM). The enhancement factor, defined as the ratio of plasmon extinction peak shift of multi-particle and single-particle arrangements caused by changes in the refractive index of the environment, was used to quantify the effect of coupling on the increased sensitivity of the dimers. The bulk refractive index sensitivity (RIS) was obtained by changing the dielectric medium surrounding the nanoparticles, while the surface sensitivity was modeled by depositing dielectric layers on the nanoparticle in an increasing thickness. The results show that by optimizing the interparticle gaps for a given layer thickness, up to ~80% of the optical response range of the nanoparticles can be utilized by confining the plasmon field between the particles, which translates into an enhancement of ~3–4 times compared to uncoupled, single particles with the same shape and size. The results also show that in these cases, the surface sensitivity enhancement is significantly higher than the bulk RI sensitivity enhancement (e.g., 3.2 times vs. 1.8 times for nanospheres with a 70 nm diameter), and thus the sensors’ response for molecular interactions is higher than their RIS would indicate. These results underline the importance of plasmonic coupling in the optimization of nanoparticle arrangements for biosensor applications. The interparticle gap should be tailored with respect to the size of the used receptor/target molecules to maximize the molecular sensitivity, and the presented methodology can effectively aid the optimization of fabrication technologies.

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Section: Introductionmentioning

confidence: 99%

Maximizing the Surface Sensitivity of LSPR Biosensors through Plasmon Coupling—Interparticle Gap Optimization for Dimers Using Computational Simulations

Bonyár

2021

Biosensors

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“…These unique characteristics have enabled the bimetallic or multimetallic systems to have improved performance in a wide range of applications such as catalysis, sensing, enhanced spectroscopy, bioimaging, and photothermal therapy. [21,44,[59][60][61] The physicochemical properties of the obtained heterostructures are highly dependent on the spatial arrangement and atomic ordering of different metal atoms. For example, Au NRs with Pt nanoparticles selectively deposited at the NR ends show a higher H 2 revolution rate than the Au NRs fully covered with Pt.…”

Section: Metals As Deposition Materialsmentioning

confidence: 99%

Heterostructures Built through Site‐Selective Deposition on Anisotropic Plasmonic Metal Nanocrystals and Their Applications

Yang

Liu

et al. 2021

Small Structures

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Figure 2. TEM images of various types of anisotropic heterostructures. a) Au NRs with Ag preferentially deposited at the ends. Reproduced with permission. [43] Copyright 2014, American Chemical Society. b) Pd-tipped Au NRs. Reproduced with permission. [51] Copyright 2018, Wiley-VCH. c) Pt-tipped Au NRs. Reproduced with permission. [45] Copyright 2014, American Chemical Society. d) Dumbbell-like PtFe-tipped Au NRs. Reproduced with permission. [54] Copyright 2018, Royal Society of Chemistry. e) Au NRs with TiO 2 deposited at the ends. Reproduced with permission. [69] Copyright 2018, Wiley-VCH. f ) Au NRs with CeO 2 deposited at the rod ends. A high-angle-annular dark-field scanning TEM (HAADFÀSTEM) image is shown. Reproduced with permission. [19] Copyright 2019, American Chemical Society. g) HOH Au NCs with Cu 2 O deposited at their vertexes. Reproduced with permission. [70] Copyright 2016, American Chemical Society. h) Au triangular nanoplates (TNPs) with Ag 2 S deposited at the edges and vertexes. Reproduced with permission. [72] Copyright 2018, Wiley-VCH. i) Au NRs with polystyrene-poly(acrylic acid) (PS-PAA) deposited at the side. Reproduced with permission. [78] Copyright 2018, Wiley-VCH. j) Au NRs with SiO 2 deposited at the ends and Pt deposited at the side. Reproduced with permission. [52] Copyright 2013, Wiley-VCH. k) Au NRs with SiO 2 deposited at the ends. Reproduced with permission. [81] Copyright 2010, American Chemical Society. l) Au NRs with TiO 2 deposited at the ends and Pt deposited at the side. Reproduced with permission. [82]

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“…The versatility of the process has been extended to bimetallic nanoparticles. In many applications such as catalysis or plasmonic the formation of alloys or bimetallic is required, e.g., for the enhancement of the catalytic activity [11] or the tuning of the plasmonic resonance [12]. In this view, the synthesis of NPs has been performed with the use of two organometallics.…”

Section: Going Beyond; Bimetallic Nanoparticlesmentioning

confidence: 99%

An original tuneable plasma process for the synthesis of tailored nanoparticles

Haye¹,

Chavée²,

Bocchese³

et al. 2020

Proceedings of 1st International Electronic Conference on Applied Sciences

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A dry process is presented to synthesize nanoparticles on different powder substrates. The process is based on the plasma degradation of solid organometallic precursors mixed with the powder substrate to generate various nanoparticles of 2-15 nm. Compared to conventional wet chemistry, plasma processing offers the advantage of reducing the environmental impact of the synthesis by reducing the energy consumption and relying on a solvent-free and waste-free scalable process. The novelty and high versatility of the process are demonstrated in this work. Choosing the right discharge parameters (pressure, reactive gas, plasma power…), amorphous or crystalline monometallic, bimetallic, oxide, or nitride nanoparticles can be produced, onto inorganic (such as TiO2) or carbon-based substrates like graphene, carbon xerogel, or carbon nanotubes. Results have been obtained for various nanoparticles, including transition (Mn, Fe, Ni), post-transition (Zn, Al), and noble metals (Cu, Pt, Pd, Rh). Moreover, the organometallic precursor(s) decomposition and the subsequent nanoparticle synthesis can be monitored in situ using optical emission spectroscopy of the plasma discharge.

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Manipulating Bimetallic Nanostructures With Tunable Localized Surface Plasmon Resonance and Their Applications for Sensing

Cited by 31 publications

References 128 publications

Maximizing the Surface Sensitivity of LSPR Biosensors through Plasmon Coupling—Interparticle Gap Optimization for Dimers Using Computational Simulations

Maximizing the Surface Sensitivity of LSPR Biosensors through Plasmon Coupling—Interparticle Gap Optimization for Dimers Using Computational Simulations

Heterostructures Built through Site‐Selective Deposition on Anisotropic Plasmonic Metal Nanocrystals and Their Applications

An original tuneable plasma process for the synthesis of tailored nanoparticles

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