Local electric field enhancement in cuboid gold nanoparticle for SERS applications

2020 ◽  
Author(s):  
Ana Maria Mihaela Gherman ◽  
Valer Tosa
Keyword(s):  
Electric Field ◽  
Gold Nanoparticle ◽  
Field Enhancement ◽  
Local Electric Field ◽  
Electric Field Enhancement ◽  
Local Electric Field Enhancement

scholarly journals Synthesis of Au–Ag Alloy Nanoparticle-Incorporated AgBr Crystals

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 745 ◽  
Author(s):  
Shin-ichi Naya ◽  
Musashi Fujishima ◽  
Hiroaki Tada
Keyword(s):  
Aqueous Solution ◽  
Electric Field ◽  
Silver Halide ◽  
Field Enhancement ◽  
Local Electric Field ◽  
Localized Surface Plasmon ◽  
Light Illumination ◽  
Chemical Transformations ◽  
Electric Field Enhancement ◽  
Local Electric Field Enhancement

Nanoscale composites consisting of silver and silver halide (Ag–AgX, X = Cl, Br, I) have attracted much attention as a novel type of visible-light photocatalyst (the so-called plasmonic photocatalysts), for solar-to-chemical transformations. Support-free Au–Ag alloy nanoparticle-incorporated AgBr crystals (Au–Ag@AgBr) were synthesized by a photochemical method. At the initial step, Au ion-doped AgBr particles were prepared by adding an aqueous solution of AgNO3 to a mixed aqueous solution of KBr and HAuBr4. At the next step, UV-light illumination (λ = 365 nm) of a methanol suspension of the resulting solids yielded Au–Ag alloy nanoparticles with a mean size of approximately 5 nm in the micrometer-sized AgBr crystals. The mole percent of Au to all the Ag in Au–Ag@AgBr was controlled below < 0.16 mol% by the HAuBr4 concentration in the first step. Finite-difference time-domain calculations indicated that the local electric field enhancement factor for the alloy nanoparticle drastically decreases with an increase in the Au content. Also, the peak of the localized surface plasmon resonance shifts towards longer wavelengths with increasing Au content. Au–Ag@AgBr is a highly promising plasmonic photocatalyst for sunlight-driven chemical transformations due to the compatibility of the high local electric field enhancement and sunlight harvesting efficiency.

Ion-Beam-Synthesised Ag-SiO2 Nanocomposite Layers for Electron Field Emission Devices

2005 ◽  
Vol 908 ◽  
Author(s):  
Wei-Mong Tsang ◽  
V. Stolojan ◽  
A. A. D. T. Adikaari ◽  
S. P. Wong ◽  
S. R. P. Silva
Keyword(s):  
Electric Field ◽  
Field Emission ◽  
Electric Fields ◽  
Integrated Circuit ◽  
Ion Beam ◽  
Field Enhancement ◽  
Pure Metal ◽  
Local Electric Field ◽  
Electric Field Enhancement ◽  
Local Electric Field Enhancement

AbstractAg-SiO2 nanocomposite layers were synthesised by Ag+ implantation into thermally oxidised SiO2 layers and demonstrated to have excellent field emission (FE) properties. These nanocomposite layers can give an emission current of 1 nA at electric fields less than 20 V/μm, compared to several thousand volts per micrometre of pure metal surfaces. Their fabrication processes are fully compatible with existing integrated circuit technology. By correlating the FE results with other characterisation techniques including atomic force microscopy, Rutherford backscattering spectroscopy and transmission electron microscopy, it is clearly demonstrated that there are two types of field enhancement mechanisms responsible for the excellent FE properties of these cathodes. Firstly, the electrically conductive Ag nano-clusters embedded in the insulating SiO2 matrix give rise to a local electric field enhancement due to an electrical inhomogeneity effect and secondly, the dense surface protrusions provide a geometric local electric field enhancement. The FE properties of these layers are critically dependent on the size and distribution of the Ag clusters, which can be controlled by the Ag dose and modified by the post-implantation pulse annealing with a high power KrF Excimer laser operating at 248 nm.

An aligned octahedral core in a nanocage: synthesis, plasmonic, and catalytic properties

Nanoscale ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 3138-3144 ◽  
Author(s):  
Evgeniia Khairullina ◽  
Kseniia Mosina ◽  
Rachelle M. Choueiri ◽  
Andre Philippe Paradis ◽  
Ariel Alcides Petruk ◽  
...  
Keyword(s):  
Electric Field ◽  
Catalytic Properties ◽  
Field Enhancement ◽  
Local Electric Field ◽  
Metal Nanostructures ◽  
Electric Field Enhancement ◽  
Optical Responses ◽  
Local Electric Field Enhancement

Plasmonic metal nanostructures with complex morphologies provide an important route to tunable optical responses and local electric field enhancement at the nanoscale for a variety of applications including sensing, imaging, and catalysis.

scholarly journals Design and fabrication of a 3D-structured gold film with nanopores for local electric field enhancement in the pore

2015 ◽  
Vol 27 (6) ◽  
pp. 065302 ◽  
Author(s):  
James A Grant-Jacob ◽  
Swe Zin Oo ◽  
Francesca Carpignano ◽  
Stuart A Boden ◽  
William S Brocklesby ◽  
...  
Keyword(s):  
Electric Field ◽  
Gold Film ◽  
Field Enhancement ◽  
Local Electric Field ◽  
Electric Field Enhancement ◽  
Local Electric Field Enhancement

scholarly journals Local electric field enhancement at the heterojunction of Si/SiGe axially heterostructured nanowires under laser illumination

2016 ◽  
Vol 27 (45) ◽  
pp. 455709 ◽  
Author(s):  
Jose Luis Pura ◽  
Julián Anaya ◽  
Jorge Souto ◽  
Ángel Carmelo Prieto ◽  
Andrés Rodríguez ◽  
...  
Keyword(s):  
Electric Field ◽  
Field Enhancement ◽  
Local Electric Field ◽  
Electric Field Enhancement ◽  
Laser Illumination ◽  
Local Electric Field Enhancement
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