Facile Preparation of Ultrasmall Void Metallic Nanogap from Self‐Assembled Gold–Silica Core–Shell Nanoparticles Monolayer via Kinetic Control

Shin, Yuna; Song, Jihwan; Kim, Dongchoul; Kang, Taewook

doi:10.1002/adma.201501163

Cited by 92 publications

(83 citation statements)

References 38 publications

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“…Preparation of Chiral NP Monolayer Films : Chiral NP monolayer films were prepared from aqueous dispersions using an oil–water (hexane–water) interface by the addition of a poor solvent to the oil–water system . In brief, l ‐ and d ‐Phe‐functionalized Au NPs were centrifuged (8000 rpm, 6 min) and suspended in 10 mL of Milli‐Q water, and then 3 mL of n ‐hexane was added to this system.…”

Section: Methodsmentioning

confidence: 99%

2D Chiroptical Nanostructures for High‐Performance Photooxidants

Sun

Cheng

et al. 2018

Adv Funct Materials

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Modulation of the chirality of solid-like nanoscale membranous structures used as selective photooxidants is an important goal of chemical and materials science. Here, the fabrication of a chiral plasmonic nanoparticle monolayer film which is a highly selective photooxidant under circularly polarized light (CPL) in the visible-light region is reported. The chiroptical activity of the film can be controlled by altering the amount and stereochemistry of amino acids. The experiments disclose that this stable and reusable catalyst is active in the selective oxidation of glucose enantiomers and CPL of opposite polarization gives around 10.3-fold increase in conversion rates. The results reveal that the handedness of polarized light dominates the catalytic activity of the chiral film. It is demonstrated that the specific chiral binding of the amino acid ligands and the local field enhancement in the light-limited regime regulates the selective photocatalytic performance, as confirmed by first-principles density functional theory and physical field simulations. With the catalyst's signature ability for chiral recognition and switching of handedness of polarized light, the discovery provides a foundation for designing and tailoring chiral inorganic photooxidants. This research also sets an example for the development of light-matter interactions and polarized optics.

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Section: Methodsmentioning

confidence: 99%

2D Chiroptical Nanostructures for High‐Performance Photooxidants

Sun

Cheng

et al. 2018

Adv Funct Materials

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“…The self‐assembly of metal nanoparticles presents one of the simplest methods of producing highly dense intermetallic nanogaps . It is a promising approach to achieve sub‐5 nm gaps between close‐packed particles, in which molecular ligands coating the particles act as precise dielectric spacers .…”

Section: Fabricationsmentioning

confidence: 99%

“…One of the promising applications is using nanogap structures as the substrate for the SERS, and SERS has been used from single‐molecule detection to multiplexed target detection applications . SERS is the amplified Raman scattering by molecules adsorbed on metal surfaces, and it is widely believed that EM and chemical enhancement mechanisms that are based on the excitation of localized surface plasmons and the formation of charge‐transfer complexes, respectively, are responsible for the SERS .…”

Section: Applicationsmentioning

confidence: 99%

“…Similarly, gaps can be defined with particles deposited onto a metal film, self‐aligned sub‐1 nm gaps between gold electrodes, and ultralong nanogaps with tunable sub‐10 nm gap widths between two nanowire from 1D to 3D were fabricated and exhibit hallmarks of exceedingly high Raman sensitivity . Plasmonic nanogaps have been created using metal nanoparticles assembly, nanosphere lithography, electron beam lithography (EBL), focused ion beam (FIB) lithography, oblique angle shadow evaporation, edge lithography, electromigration, mechanically controllable break junction, on‐wire lithography, and so on.…”

Section: Introductionmentioning

confidence: 99%

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Plasmonic Nanogaps: From Fabrications to Optical Applications

Zhang

2018

Adv Materials Inter

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Metallic nanostructures with nanogap features are proved to be highly effective building blocks for plasmonic systems, as they can provide ultrastrong electromagnetic (EM) fields and controllable optical properties. A wide range of fields, including surface enhanced spectroscopy, sensing, imaging, nonlinear optics, optical trapping, and metamaterials, are benefited from these enhanced EM fields. This review outlines the latest development of the fabrication methods for nanogap structures (metal nanoparticle assembly, nanosphere lithography, electron beam lithography (EBL), focused ion beam (FIB) lithography, oblique angle shadow evaporation, edge lithography, and so on), followed by a summary of their optical applications. The present review will inspire more ingenious designs and fabrications of plasmonic nanogap structures with lithography‐free fabrication techniques, and promote their applications in optics and electronics.

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“…Shin et al 2015 [17] demonstrated that a single layer of self-assembled core metal particles with silica shells can produce 1~2 nm empty nano-gaps by assembling silica-gold nanoparticles (Au@SiO 2 ) and chemical etching on different substrates. Colloidal silica shell gold-core nanoparticles were prepared by adding 5% v/v (3-aminopropyl)trimethoxysilane to gold nanoparticle seed solution.…”

mentioning

confidence: 99%

Nanosynthesis Techniques of Silica-Coated Nanostructures

Shah¹

2018

Novel Nanomaterials - Synthesis and Applications

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Core-shell nanomaterials are fast-emerging hybrid nanocomposites in area of nanotechnology, materials science and biochemistry, which are fast attracting research attention. Nanostructured nanomaterials are utilized in wide industry fields such as electronics, biopharmaceutical, biomedicine, optics and biocatalysis. Owing to the additional exterior shell-coating material, the primary core material's functionality, biocompatibility, chemical stability and colloidal dispersibility can be greatly enhanced. Silica, in particular, is found to be an excellent exterior shell-coating material, has been widely researched for the synthesis of core-shell nanocomposite materials. So far, there have been numerous publications devoted to silica-coating techniques using hydrophobic silanes, such as tetraethylorthosilicate (TEOS) or tetramethyl orthosilicate (TMOS), via the classic Stober method. Recently, there has been strong interest in the use of water-soluble silanes such as MPTMS (3-(mercaptopropyl)-trimethoxysilane), MPTES (3-(mercaptopropyl-triethoxysilane), MTMS (3-(methyltrimethoxysilane)) and sodium silicate for water-based silica-coating techniques have gained much attention, due to the fastgrowing need to focus on process simplicity, large-scale fabrication and environmentalfriendly synthesis techniques of silica-based core-shell nanomaterials. Hence, this chapter focuses on the recent development on silica-coating techniques for colloidal nanoparticles, particularly on water-based techniques and morphologies. In summary, we emphasize the importance of advanced nanomaterials in today's world and envisage there will be more breakthrough research on aqueous silica-coating techniques for silica-encapsulated core-shell nanomaterials.

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Facile Preparation of Ultrasmall Void Metallic Nanogap from Self‐Assembled Gold–Silica Core–Shell Nanoparticles Monolayer via Kinetic Control

Cited by 92 publications

References 38 publications

2D Chiroptical Nanostructures for High‐Performance Photooxidants

2D Chiroptical Nanostructures for High‐Performance Photooxidants

Plasmonic Nanogaps: From Fabrications to Optical Applications

Nanosynthesis Techniques of Silica-Coated Nanostructures

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