scholarly journals Plasmonic response and SERS modulation in electrochemical applied potentials

2017 ◽  
Vol 205 ◽  
pp. 537-545 ◽  
Author(s):  
G. Di Martino ◽  
V. A. Turek ◽  
C. Tserkezis ◽  
A. Lombardi ◽  
A. Kuhn ◽  
...  
Keyword(s):  
Applied Voltage ◽  
Au Nanoparticles ◽  
Electrochemical Cell ◽  
Optical Response ◽  
Electronic Interaction ◽  
Raman Amplification ◽  
Electrode Surfaces ◽  
Au Film

We study the optical response of individual nm-wide plasmonic nanocavities using a nanoparticle-on-mirror design utilised as an electrode in an electrochemical cell. In this geometry Au nanoparticles are separated from a bulk Au film by an ultrathin molecular spacer, giving intense and stable Raman amplification of 100 molecules. Modulation of the plasmonic spectra and the SERS response is observed with an applied voltage under a variety of electrolytes. Different scenarios are discussed to untangle the various mechanisms that can be involved in the electronic interaction between NPs and electrode surfaces.

Hydrogen Peroxide Sensor Based on Horseradish Peroxide (HRP) Immobilized PANI Electrode with Au Nanoparticles

2007 ◽  
Vol 342-343 ◽  
pp. 865-868 ◽  
Author(s):  
Kang Deuk Seo ◽  
Seong Dae Oh ◽  
Seong Ho Choi ◽  
Sang Hyub Oh ◽  
Jin Chun Woo ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Electrochemical Polymerization ◽  
Physical Adsorption ◽  
Covalent Bonding ◽  
Au Nanoparticle ◽  
Adsorption Method ◽  
Au Film ◽  
Self Assembling ◽  
Horseradish Peroxide ◽  
Immobilization Method

In order to prepare the enzyme electrode for sensing of chemical molecules, the Au was coated on the surface of PP film by sputter coater. Polyaniline (PANI) was polymerized on the surface of the coated Au film by electrochemical polymerization of aniline in order to use working electrode. Subsequently, horseradish peroxide (HRP) was immobilized on PANI electrode as follows: Method I. The HRP was immobilized on the surface of PANI electrode by using Au nanoparticle as linker (physical adsorption). Method II. The HRP was immobilized on the surface of PANI electrode by using 2-aminothiophenol and Au nanoparticle as linker (Self-assembling immobilization). Method III. HRP was directly immobilized with PANI electrode by using glutaric dialdehyde as linker (covalent bonding). The sensing efficiency of the prepared HRP-PANI electrode was also examined. The sensing efficiency of the HRP-PANI electrode for H2O2 was as following order; Method I > Method III > Method II..

Siderophore-inspired nanoparticle-based biosensor for the selective detection of Fe3+

2015 ◽  
Vol 3 (2) ◽  
pp. 270-275 ◽  
Author(s):  
Daniel J. Phillips ◽  
Gemma-Louise Davies ◽  
Matthew I. Gibson
Keyword(s):  
Au Nanoparticles ◽  
Optical Response ◽  
Selective Detection

Au nanoparticles modified with catechol-functionalised polymers provide a strong optical response which is highly specific to Fe3+ ions at physiologically relevant concentrations.

Easy Preparation of Electrode Surfaces with Dispersed Size-Controlled Au Nanoparticles by Electrodeposited PPI-Dendrimers as Templates

2017 ◽  
Vol 164 (6) ◽  
pp. H396-H406 ◽  
Author(s):  
Carlos Villena ◽  
José Losada ◽  
Beatriz Alonso ◽  
Carmen M. Casado ◽  
M. Pilar García Armada
Keyword(s):  
Au Nanoparticles ◽  
Electrode Surfaces ◽  
Size Controlled

scholarly journals Electrochemical removal of zinc and nickel ions from wastewater using porous electrodes

2021 ◽  
Author(s):  
Qazi Sabir
Keyword(s):  
Applied Voltage ◽  
Electrochemical Cell ◽  
Operating Conditions ◽  
Porous Electrodes ◽  
Nickel Ions ◽  
Porous Aluminum ◽  
Liquid Flux ◽  
Flow Through ◽  
Simulated Wastewater ◽  
Aluminum Plates

Simulated wastewater containing Ni++ and Zn++ was treated using an electrochemical cell. Porous aluminum cathode and porous stainless steel anode were used in a flow-through configuration. For porous catholdes, both aluminium foam and corrugated aluminum plates having perforations were used. To study the effects of applied voltage and volumetric liquid flux on the removal of Ni++ and Zn++, the electrochemical cell was operated for 48 hours at different applied voltages of 5, 10, 15, 20 and 25 V, and at different volumetric liquid fluxes both in the laminar (0.00471 and 0.00943 m³.m-².s-¹) and turbulent regimes (0.01414, 0.01886 and 0.02357 m³.m-².s-¹). For the maximum removal of both nickel and zinc ions, the optimum applied voltage and volumetric liquid flux were found to be 12 V and 0.02357 m³.m-².s-¹, respectively; under these operating conditions, the concentrations of Ni++ and Zn++ in the simulated wastewater were reduced by 85.5% and 98%, respectively. Operating beyond an applied voltage of 12 V, the removal of Zn++ was slightly improved and achieved a maximum value of 99.05% at 25 V; however, an opposite trend was observed in case of Ni++ removal, which finally decreased to 56% at 25 V., because of the excessive precipitation of Ni++ as nickel hydoroxide.

scholarly journals Tuning the optical response of cross-linked Fe@Au nanoparticles

2020 ◽  
Vol 514 ◽  
pp. 145921
Author(s):  
Najme Ahmadi ◽  
Reza Poursalehi ◽  
Andrei Kirilyuk ◽  
Mohammad Kazem Moravvej-Farshi
Keyword(s):  
Au Nanoparticles ◽  
Optical Response

Size- and Shape-Dependent Nonlinear Optical Response of Au Nanoparticles Embedded in Sapphire

2013 ◽  
Author(s):  
O. Sánchez-Dena ◽  
P. Mota-Santiago ◽  
L. Tamayo-Rivera ◽  
A. Crespo-Sosa ◽  
A. Oliver ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Au Nanoparticles ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Size And Shape
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