Three-Dimensional Gold Nanosphere Hexamers Linked with Metal Bridges: Near-Field Focusing for Single Particle Surface Enhanced Raman Scattering

Yoo, Sungjae; Kim, Guntae; Kim, Jae‐Myoung; Son, Jiwoong; Lee, Sungwoo; Hilal, Hajir; Haddadnezhad, MohammadNavid; Nam, Jwa‐Min; Park, Sungho

doi:10.1021/jacs.0c06463

Cited by 33 publications

(46 citation statements)

References 31 publications

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“…As a result, individual Au nanospheres are formed on the vertices, and nanogaps between Au nanospheres are formed (Figure 2h). [81] Furthermore, asymmetric Au split nanorings (Au SNRs) with point and linear intrananogaps were reported (Figure 2i). [82] In order to synthesize Au nanorings with symmetry breaking, a thick Au nanodisk is needed as a template for the partial deposition of Pt at the periphery.…”

Section: Intragap Formation Via Metal Shell Growth On the Spacer Layermentioning

confidence: 96%

Synthesis, Assembly, Optical Properties, and Sensing Applications of Plasmonic Gap Nanostructures

Kim

Lee

et al. 2021

Advanced Materials

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sharp-tip structures with a highly focused field at the end of the tip. [7] In particular, plasmonic gap nanostructures (PGNs) are among the most promising materials for diverse applications with highly localized field and amplified optical signals in the gap including sensing, spectroscopy, optics, biomedicine, electronics, and energy applications. [8][9][10][11][12][13] The development of bottom-up or top-down synthetic methods enabled the access to numerous nanogap structures with diverse gap sizes, morphologies, and compositions. [14][15][16][17][18] The highly localized electric field inside the plasmonic nanogap and the appearance of plasmonic coupling in closely neighboring structures have been studied, leading to the discovery of interesting optical phenomena and advances in sensing such as ultrasensitive spectroscopy, singlemolecule sensing methods, and in situ detection techniques. [19][20][21] As small changes in the distance, morphology, and composition of the nanogap lead to significant variations in the optical responses, the highly precise, controllable, and high-yielding preparation of PGNs is important to achieve reproducible and reliable results. However, although numerous pioneering studies on basic synthetic methods, characteristics, and applications enabled the understanding and control over plasmonic nanogaps, key challenges still remain for the practical use and applications of PGNs. In particular, the sub-nanometer, atomic-level control of the nanogap, coupled with the scaling-up issue, and its fundamental understanding have not yet been fully accomplished. For example, in surfaceenhanced Raman spectroscopy (SERS) using plasmonic gaps, early research focused on a high enhancement factor (EF). In contrast, recent studies revealed that a deep understanding at atomic scale is required, as differences in the small regime such as picocavities or molecular orientation can have a large effect on the signal. [22][23][24] Hence, a comprehensive understanding of the nanogap is critical to the further development of the field.This progress report addresses emerging issues and challenges in the field of nanogap-based plasmonics and plasmonic nanomaterials. We first describe the challenges in the creation of intra-or intergaps by bottom-up or top-down synthesis, and discuss breakthroughs that allow for overcoming these obstacles. Next, optical properties according to gap size, morphology, and composition are summarized to provide insight into the nature of gap plasmonics. The discussion of applications in this article mainly highlights surface-enhanced Plasmonic gap nanostructures (PGNs) have been extensively investigated mainly because of their strongly enhanced optical responses, which stem from the high intensity of the localized field in the nanogap. The recently developed methods for the preparation of versatile nanogap structures open new avenues for the exploration of unprecedented optical properties and development of sensing applications relying on the amplification of various optical signals....

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Section: Intragap Formation Via Metal Shell Growth On the Spacer Layermentioning

confidence: 96%

Synthesis, Assembly, Optical Properties, and Sensing Applications of Plasmonic Gap Nanostructures

Kim

Lee

et al. 2021

Advanced Materials

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“…Hybrid nanostructures composed of plasmonic metal NCs and other components such as metals and semiconductors take advantage of LSPR-induced light absorption of plasmonic metal NCs and energy transfer to the adjacent components. Such characteristics can be used for a variety of plasmon-enabled or powered applications, including surface-enhanced Raman spectroscopy, [110][111][112][113] plasmon-enhanced fluorescence, [114,115] photocatalysis, [116,117] plasmon-enhanced electrocatalysis, [118,119] as well as phototherapy. [120,121] In the following paragraphs, different applications based on anisotropic plasmonic heterostructures are discussed in detail.…”

Section: Applicationsmentioning

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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“…To date, enormous efforts have been devoted to improve the physicochemical properties of nanoframes [6][7][8][9][10][11][12][13][14][15][16][17][18] by controlling the structural parameters such as shape, size, thickness, and composition. Nevertheless, all the nanoframes synthesized so-far are structurally simple and mainly composed of single-rim structures, limiting the utilization of inner voids, making it di cult to harness e cient structural coupling effects or light-matter interactions [19][20][21][22][23] . In this regard, integrating multiple nanoframes in a single entity can be considered as a new paradigm for e ciently amplifying the structural characteristics of nanoframes.…”

Section: Introductionmentioning

confidence: 99%

N-th Nanoframes

Yoo

Lee

Hilal

et al. 2022

Preprint

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Herein, we report unprecedented four-dimensional complex nanoparticles by embedding various kinds of three-dimensional polyhedral nanoframes within a single entity. This synthetic strategy is based on the selective deposition of metal atoms on high surface energy facets and subsequent growth into solid platonic nanoparticles, followed by the etching of inner metals, leaving complex nanoframes. Our synthetic routes are rationally designed and executable on-demand with a high structural controllability. Diverse Au solid nanostructures (octahedra, truncated octahedra, cuboctahedra, and cubes) evolved into complex multi-layered nanoframes with different numbers/shapes/sizes of internal nanoframes. We refer to the resulting four-dimensional complex nanoframes as “N-th nanoframes”. After coating the surface of the N-th nanoframes with plasmonically active metal (like Ag), the materials exhibited highly enhanced electromagnetic near-field focusing embedded within the internal complicated rim architecture.

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Three-Dimensional Gold Nanosphere Hexamers Linked with Metal Bridges: Near-Field Focusing for Single Particle Surface Enhanced Raman Scattering

Cited by 33 publications

References 31 publications

Synthesis, Assembly, Optical Properties, and Sensing Applications of Plasmonic Gap Nanostructures

Synthesis, Assembly, Optical Properties, and Sensing Applications of Plasmonic Gap Nanostructures

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

N-th Nanoframes

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