Synthesis and Surface Plasmonic Characterization of Asymmetric Au Split Nanorings

Haddadnezhad, MohammadNavid; Yoo, Sungjae; Kim, Guntae; Kim, Jae‐Myoung; Son, Jiwoong; Jeong, Hye-Won; Park, Doojae; Nam, Jwa‐Min; Park, Sungho

doi:10.1021/acs.nanolett.0c03385

Cited by 34 publications

(31 citation statements)

References 40 publications

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“…[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. After selective etching of Au, Au@Pt split frames were synthesized, and Au hexagonal SNRs are synthesized with Au growth step.…”

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

confidence: 99%

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: 99%

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

Kim

Lee

et al. 2021

Advanced Materials

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“…There is an ever-growing attention in the fabrication of asymmetric plasmonic hierarchical nanostructures (HNs) as they may provide enormous opportunities to regulate their collective properties via the electronic, photonic, and magnetic interactions. [1][2][3][4] These are extremely significant for the applications related to the localized surface plasmon resonance (LSPR) of noble metal nanostructures (Au and Ag), such as surface-enhanced sensing, [5,6] hot-electron transfer, [7,8] catalysis, [9,10] and photothermal conversion. [11,12] For example, the interaction of light and matter largely relies on the strong electromagnetic near fields with unique spatial distribution, which is of vital importance to achieve enhanced performance.…”

Section: Introductionmentioning

confidence: 99%

Atom Absorption Energy Directed Symmetry‐Breaking Synthesis of Au–Ag Hierarchical Nanostructures and Their Efficient Photothermal Conversion

Zhang

Hang

Wang

et al. 2022

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Asymmetric plasmonic hierarchical nanostructures (HNs) are of great significance in optics, catalysis, and sensors, but the complex growth kinetics and lack of fine structure design limit their practical applications. Herein, a new atom absorption energy strategy is developed to achieve a series of Au–Ag HNs with the continuously tuned contact area in Janus and Ag island number/size on Au seeds. Different from the traditional passive growth mode, this strategy endows seed with a hand to capture the hetero atoms in a proactive manner, which is beyond the size, shape, and assembles of Au seed. Density functional theory reveals ththe adsorption of PDDA on Au surface leads to lower formation energy of Au–Ag bonds (−3.96 eV) than FSDNA modified Au surface (−2.44 eV). The competitive adsorption of two ligands on Au seed is the decisive factor for the formation of diverse Au–Ag HNs. In particular, the Au–Ag2 HNs exhibit outstanding photothermal conversion capability in the near‐infrared window, and in vivo experiments verify them as superior photothermal therapy agents. This work highlights the importance of the atom absorption energy strategy in unlocking the diversity of HNs and may push the synthesis and application of superstructures to a higher level.

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“…A major obstacle limiting further development is the lack of synthetic approaches to metal nanostructures with sufficient responses to surrounding physicochemical changes. Previous studies have reached an agreement that metal nanocrystals with unconventional surface concavity have superior sensing and catalytic performances over nanostructures with positive curvatures because of the exposure of high-index facets and improved electric field enhancement. − From the thermodynamic point of view, such concave nanostructures are not stable, offering new opportunities to design novel materials with colorimetric responses. − …”

Section: Introductionmentioning

confidence: 99%

Creation and Reconstruction of Thermochromic Au Nanorods with Surface Concavity

Zhang

Jin

et al. 2021

J. Am. Chem. Soc.

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Conventional colloidal syntheses typically produce nanostructures with positive curvatures due to thermodynamic preference. Here, we demonstrate the creation of surface concavity in Au nanorods through seed-mediated growth in confined spaces and report their thermochromic responses to temperature changes. The unique surface concavity is created by templating against Fe 3 O 4 nanorods, producing a new concavity-sensitive plasmonic band. Due to the high surface energy, the metastable nanorods can be reconstructed at a moderate temperature, enabling convenient and precise tuning of their plasmonic properties by aging in different solvents. Such structural reconstruction of concave Au nanorods enables the fabrication of thermochromic plasmonic films that can display images with vivid color changes or exhibit encrypted, invisible information upon aging. This templating strategy is universal in creating concave nanostructures, which may open the door to designing new nanostructures with promising applications in sensing, anticounterfeiting, information encryption, and displays.

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Synthesis and Surface Plasmonic Characterization of Asymmetric Au Split Nanorings

Cited by 34 publications

References 40 publications

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

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

Atom Absorption Energy Directed Symmetry‐Breaking Synthesis of Au–Ag Hierarchical Nanostructures and Their Efficient Photothermal Conversion

Creation and Reconstruction of Thermochromic Au Nanorods with Surface Concavity

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