Hot electron chemistry has drawn tremendous attention from applications related to materials, energy, sensing, and catalysis. The plasmon‐induced generation of hot electrons their transfer behavior are very important for understanding plasmonic‐enhanced achieving practically useful efficiency. From a plasmonic perspective, well‐designed structures that can manipulate surface plasmons able enhance the efficiencies electron‐based processes. This progress report summarizes recent experimental...

Uniformly controlling a large number of metal nanostructures with plasmonically enhanced signal to generate quantitative optical signals and the widespread use these structures for surface-enhanced Raman scattering (SERS)-based biosensing bioimaging applications are paramount importance but extremely challenging. Here, we report highly controllable, facile selective-interdiffusive dealloying chemistry synthesizing dealloyed intra-nanogap particles (DIPs) ∼2 nm intragap in high yield (∼95%)...

There has been enormous interest in understanding and utilizing plasmon-enhanced fluorescence (PEF) with metal nanostructures, but maximizing the enhancement a reproducible, quantitative manner while reliably controlling distance between dyes particle surface for practical applications is highly challenging. Here, we designed synthesized fluorescence-amplified nanocuboids (FANCs) enhanced controlled PEF signals, fluorescent silica shell-coated FANCs (FS-FANCs) were then formed to fixate dye...

Ag nanoparticles have garnered significant attention for their excellent plasmonic properties and potential use as cavities, primarily because of intrinsically low ohmic losses optical in the visible range. These are particularly crucial systems involving quantum dots that absorb light at wavelengths, where need a high threshold energy interband transitions necessitates incorporation nanostructures. However, synthesis still encounters challenges achieving structural uniformity...

The plasmonic properties of metal nanostructures have been heavily utilized for surface-enhanced Raman scattering (SERS) and metal-enhanced fluorescence (MEF), but the direct photoluminescence (PL) from nanostructures, especially with coupling, has not widely used as much SERS MEF due to lack understanding PL mechanism, relatively weak signals, poor availability synthetic methods strong signals. is beneficial if these issues can be addressed because it does exhibit photoblinking or...

The development of a stepwise synthetic strategy for Au ring-in-a-triangle nanoframes with high degree structural solidity is essential to the advancement highly amplified near-field focusing. This leads formation an inscribed nanoring in triangular metal frame stability withstand elevated temperatures and oxidizing environment, which critical successful single-particle surface-enhanced Raman scattering (SERS). existence nanorings plays important role enhancing so-called "lightning rod...

Surface-enhanced Raman scattering (SERS)-based sensing is promising in that it has potential to allow for highly sensitive, selective, and multiplexed detection imaging. However, the controlled assembly gap formation between plasmonic particles generating strong SERS signals a quantitative manner challenging, especially on biodetection platforms, particle-to-particle variation signal enhancement can vary by several orders of magnitude single batch, largely limiting reliable use practical...

In this Letter, a rational and stepwise method for the solution-phase synthesis of asymmetric Au split nanorings by adopting nanoprisms as template has been demonstrated. The selective chemical etching nanoprism tips activated surface reactivity edges led to deposition Pt at periphery nanoplates. By controlling total amount on edges, different degrees Au@Pt were obtained; subsequent coating around scaffold eventually resulted in hexagonal nanorings. Their plasmonic features function...

Herein, we report the novel strategy for synthesis of complex 3-dimensional (3D) nanostructures, mimicking linker molecule-free 3D arrangement six Au nanospheres at vertices octahedrons. We utilized PtAu skeleton structural rigidity and deposited around in a site-selective manner, allowing us to investigate their surface plasmonic coupling phenomenon near-field enhancement as function sizes nanospheres, which are directly related intrananogap distance interior volume size. The resulting...

We designed complex Au nanorings with intertwined triple rings (ANITs) in a single entity to amplify the efficacy of near-field focusing. Such and unprecedented morphology at nanoscale was realized through on-demand multistepwise reactions. Triangular nanoprisms were first sculpted into circular nanorings, followed by series chemical etching deposition reactions eventually leading ANITs wherein thin metal bridges hold structure together without any linker molecules. In reaction, well-faceted...

Herein, we demonstrate plasmonic photothermal PCR utilizing magnetic nanoparticles as nano-sized heater and separator for fluorescence detection. Plasmonic can be completed in 5.5 min with LOD of 3.3 copies per μL.

To maximize near-field focusing around nanoscale metal particles, we designed large-sized (214 nm diameter) gold (Au) double nanorings comprising two concentric rings with gaps between them (intra-nanogaps). The circular intra-nanogaps resembled the hot halos which single-particle surface-enhanced Raman scattering (SERS) could occur when analytes are present in gaps. Herein, called SERS-active Au "Au nanohalos". synthesis of nanohalos was based on a novel strategy employing hexagonal...

We report a synthetic approach for heterometallic (Au-Pt-Au) nanorings with intertwined triple rings (NITs), wherein three differently sized metal circular concentrically overlap in single entity. The method allows one to control the component of core (Au or Pt) tunable gap distance. narrow nanogaps between inner and outer Au strongly enhance electromagnetic near-field via intraparticle coupling localized surface plasmon resonance, which realizes surface-enhanced Raman scattering (SERS) at...

The frequent outbreaks of foodborne illness demand rapid detection pathogens. Unfortunately, conventional methods for pathogen and identification are labor-intensive take days to complete. Biosensors have shown great potential the Surface plasmon resonance (SPR) sensors been widely adapted as an analysis tool study various biological binding reactions. SPR biosensors could detect antibody-antigen bindings on sensor surface by measuring either a angle or refractive index value. In this study,...

Abstract The amplification‐ and enzyme‐free quantification of DNA at ultralow concentrations, on the order 10–1000 targets, is highly beneficial but extremely challenging. To address this challenge, true detection signals must be reliably discriminated from false or noise signals. Herein, we describe development associating dissociating nanodimer analysis (ADNA) as a method that enables maximum number to collected target‐binding events while keeping nonspecific minimum level. In ADNA assay...

We synthesized a Au nanolens with electromagnetic near-field focusing capability by integrating nanoporous structure at the center of Pt@Au nanoring <italic>via</italic> synthetic steps eccentric growth Ag and nanoscale Galvanic exchange reaction.

Synthetic strategies of web-above-a-ring (WAR) and web-above-a-lens (WAL) nanostructures are reported. The WAR has a controllable gap between the nanoring core nanoweb with nanopores for effective confinement electromagnetic field in nanogap subsequent surface-enhanced Raman scattering (SERS) dyes inside high signal reproducibility, which attributed to generation circular 3D hot zones along rim Pt@Au nanorings wrapping architecture. More specifically, adopted as plasmonic structural rigidity...

Plasmonic electrochromism, a change in the localized surface plasmon resonance (LSPR) with an applied electric potential, has been attracting increasing attention for development of spectroscopic tools or optoelectronic systems. There is consensus on mechanism plasmonic electrochromism based classical capacitor and Drude model. However, electrochromic behaviors metallic nanoparticles narrow optical windows have demonstrated only small monotonic LSPR shifts, which limits use electrochromism....

Rational design of plasmonic colloidal assemblies via bottom-up synthesis is challenging but would show unprecedented optical properties that strongly relate to the assembly's shape and spatial arrangement. Herein, cyclic Au nanosphere hexamers (PCHs) reported, wherein six nanospheres (Au NSs) are connected thin metal ligaments. By tuning reduction, dangling NSs interconnected with a core hexagon nanoplate (NPL). Then, Pt atoms selectively deposited on edges spheres. After etching core,...

We report the synthetic pathway (concentric and eccentric growth) for Ag on PtAu nanorings to synthesize morphology-controlled nanorings.

Hongxing Xu, Jwa-Min Nam, and co-workers explore the use of solar light as energy source to generate hot electrons for chemical reactions, in article number 1700004. Hot electrons, generated on metal nanostructures by light, can be readily used reactions (p,p'- dimercaptoazobenzene formation is shown cover) or diffused onto metal/semiconductor interfaces accelerate semiconductor surface.

Abstract The amplification‐ and enzyme‐free quantification of DNA at ultralow concentrations, on the order 10–1000 targets, is highly beneficial but extremely challenging. To address this challenge, true detection signals must be reliably discriminated from false or noise signals. Herein, we describe development associating dissociating nanodimer analysis (ADNA) as a method that enables maximum number to collected target‐binding events while keeping nonspecific minimum level. In ADNA assay...

Au Nanosphere Hexamers Plasmonic cyclic nanosphere hexamers (PCHs) are synthesized by a template-assisted colloidal reaction. PCHs exhibit unique combinatorial plasmonic features, showing individual spherical NPs and in-plane coupling of entire nanorings. These structures have hot-spots that suitable for near-field focusing in single particle level can be applied quantitative SERS-based immunoassay. More details found article number 2205956 Jwa-Min Nam, Sungho Park, co-workers.