Solution-Phase Synthesis of Branched Metallic Nanoparticles for Plasmonic Applications&lt;sup&gt; &lt;/sup&gt;

Ujihara, Masaki

doi:10.5650/jos.ess17262

Cited by 7 publications

(9 citation statements)

References 62 publications

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“…Branched plasmonic NPs are exciting platforms with potential to revolutionize a variety of applications due to tunable far-field response and strong near-field enhancements. By examining these recent studies, general criteria that dictate the optoelectronic response of branched plasmonic NPs with high symmetry can be established. The confinement of the charge separation to tips of branched NPs leads to strong EF enhancements that are localized at their tips. , This rule is evident from the study of Au nanostars in which molecules adsorbed preferentially to the branch tips are anticipated to have 10-fold SERS enhancements compared to molecules adsorbed to the nonbranched core For structures of constant composition, increasing both the overall size and branch length of a branched NP will cause a red shift in the plasmon resonance. , In general, this rule is consistent with the idea that increasing the size of a NP results in an increase in the plasmon length (i.e., the distance along which the osculation occurs) .…”

Section: Discussionmentioning

confidence: 99%

“…The confinement of the charge separation to tips of branched NPs leads to strong EF enhancements that are localized at their tips. , This rule is evident from the study of Au nanostars in which molecules adsorbed preferentially to the branch tips are anticipated to have 10-fold SERS enhancements compared to molecules adsorbed to the nonbranched core …”

Section: Discussionmentioning

confidence: 99%

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Branched Plasmonic Nanoparticles with High Symmetry

2019

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Branched plasmonic nanoparticles (NPs) composed of noble metals are an interesting subclass of plasmonic NPs due to their unique properties that arise from the strong electric field enhancements that occur at their tips. The plasmonic properties of branched metal NPs can be manipulated through altering their symmetry and structural features such as branch sharpness, composition, and their surroundings. In this Featured Article, the unique optical properties that arise from branched plasmonic NPs are introduced, which were revealed through pioneering studies of Au nanostars and related structures. Next, branched NPs with high symmetry are discussed as a model system to explore more fully how parameters such as NP size, shape, and composition impact their properties, enabling applications in chemical sensing and beyond. These studies provide design criteria and synthetic strategies toward new nanostructures with increasing structural and compositional complexity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Branched Plasmonic Nanoparticles with High Symmetry

2019

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“…Such an interaction can thus significantly change the conjugated character of the π-bonding in the molecule and, therefore, its conductivity. The conductivity directly changes the effective mass and, according to (22), the plasmon frequency, that can be easily measured. We believe that this new type of plasmons can have a unprecedented impact on the field of deep tissue chemical sensing.…”

Section: Discussionmentioning

confidence: 99%

“…a) Electronic mail: alex99@iph.krasn.ru b) Electronic mail: spolyutov@sfu-kras.ru Gold is the most known substance for plasmonic applications due to its light absorption in the visible region. It is often used in the form of separate nanoparticles (NPs), nanorods or 3-D materials built from NPs 22,23 . Besides of Au NPs, silver and copper nanoparticles are also employed, albeit to a lesser extent due to their instability 1,4,7,8,10,19,21 .…”

Section: Introductionmentioning

confidence: 99%

Charge-transfer plasmons with narrow conductive molecular bridges: A quantum-classical theory

Федоров

Краснов

Visotin

et al. 2019

The Journal of Chemical Physics

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We analyze a new type of plasmon systems arising in small metal nanoparticles linked by narrow conductive molecular bridges. In contrast to the well-known charge-transfer plasmons, the bridge in these systems consists only of a narrow conductive molecule or polymer in which the electrons move in a ballistic mode, showing quantum effects. The plasmonic system is studied by an original hybrid quantum-classical model accounting for the quantum effects, with the main parameters obtained from first-principle DFT simulations. We have derived a general analytical expression for the modified frequency of the plasmons and have shown that its frequency lies in the near-infrared region and strongly depends on the conductivity of the molecule, on the nanoparticle -molecule interface and on the size of the system. As illustration, we explored the plasmons in a system consisting of two small gold nanoparticles linked by a conjugated polyacetylene molecule terminated by sulfur atoms. It is argued that applications of this novel type of plasmons may have wide ramifications in the areas of chemical sensing and IR deep tissue imaging.

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“…Silver and gold nanoparticles have found their targeted applications in the enhancement of Raman scattering due to the optical properties that are associated with the existence of localized surface plasmon resonance (LSPR) [4][5][6][7][8] with the absorption maximum in visible part of the electromagnetic part of the spectra. Thanks to this fact the particles provide a significant enhancement of the Raman signal used in the highly sensitive analytical method of surface-enhanced Raman spectroscopy (SERS) [9][10][11][12] used in biology and medicine [13][14][15][16][17]. Transitional metals are commonly known for their high catalytic activity, which is even amplified by the nanodimension of the metal nanoparticles with high ratio between the surface area and the volume of the particle because the catalytic process is located on the surface [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Aspects of Metal Nanoparticle Preparation

Kvı́tek¹,

Prucek²,

Panáček³

et al. 2020

Engineered Nanomaterials - Health and Safety

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Physicochemical properties, including optical properties or catalytic activity, and biological properties of metal nanoparticles are considerably influenced by their diameter. Therefore, a tailored synthesis of metal nanoparticles represents a key topic in the field of nanotechnology, and the number of research papers, concerning this topic, has been annually growing with an arithmetic progression. Metal nanoparticles are most frequently prepared via chemical reduction of metals in ionic form from their solutions. Using this synthetic approach, tailored parameters of the particles can be achieved via the adjustment of numerous factors: difference of potentials of the metal redox system and the reducing agent redox system, pH of the reaction mixture, and its temperature. The influence of these three factors on the diameter of the prepared metal nanoparticles will be discussed in the following chapter with respect to general laws and based on numerous examples from research practice.

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Solution-Phase Synthesis of Branched Metallic Nanoparticles for Plasmonic Applications<sup> </sup>

Cited by 7 publications

References 62 publications

Branched Plasmonic Nanoparticles with High Symmetry

Branched Plasmonic Nanoparticles with High Symmetry

Charge-transfer plasmons with narrow conductive molecular bridges: A quantum-classical theory

Physicochemical Aspects of Metal Nanoparticle Preparation

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