Surface-plasmon voltammetry using a gold grating

Jory, M. J.; Cann, P. S.; Sambles, J. R.

doi:10.1088/0022-3727/43/38/385301

Cited by 2 publications

(12 citation statements)

References 62 publications

(166 reference statements)

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“…As in the case of sulfate, a large cathodic current is present for the protonation of the Au film electrode and HER 50. Just as is the case for sulfate adsorption, clear acetate adsorption and desorption peaks were present while hydrogen-related and secondary reactions were not detectable.…”

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confidence: 80%

“…28-31, 36, 39-44 Also unlike the ITO substrate, anions readily adsorb to gold at anodic potentials [45][46][47] causing large changes in optical and electronic properties of the thin film. [48][49][50] Au nanoparticle monomers and chemically assembled dimers were deposited onto the two substrates, 51 and surface ligands were chemically removed from the monomers and dimers to leave the nanoparticles in electrical contact with the Figure 1. The potential-induced spectral shifts of Au plasmonic nanoparticles in Na 2 SO 4 electrolyte were strongly substrate-dependent.…”

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confidence: 99%

“…A similar differential approach was used to establish a bulk surface plasmon-based electrochemical sensor using macroscopic gold diffraction grating electrodes and observed changes in the surface plasmon polariton wavevector. 50 Using the directionality (shown by arrows in all plots) and known potential, we can clearly identify the peaks associated with adsorption and desorption of sulfate ions ( Figure 2C). We found excellent agreement between literature-reported sulfate adsorption potentials, 22 spPV, and concurrently measured conventional CV.…”

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confidence: 99%

“…Bulk studies on similar systems have reported the same insensitivity to hydrogen-related reactions. 50 Likewise, conventional CV has a large non-Faradaic component corresponding to the charging of the electrochemical capacitor ( Figure S1a, for example). 71 This time-dependent charging current is not immediately apparent in the spPV trace.…”

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confidence: 99%

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Single-Particle Plasmon Voltammetry (spPV) for Detecting Anion Adsorption

et al. 2016

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Nanoparticle and thin film surface plasmons are highly sensitive to electrochemically induced dielectric changes. We exploited this sensitivity to detect reversible electrochemical potential-driven anion adsorption by developing single-particle plasmon voltammetry (spPV) using plasmonic nanoparticles. spPV was used to detect sulfate electroadsorption to individual Au nanoparticles. By comparing both semiconducting and metallic thin film substrates with Au nanoparticle monomers and dimers, we demonstrated that using Au film substrates improved the signal in detecting sulfate electroadsorption and desorption through adsorbate modulated thin film conductance. Using single-particle surface plasmon spectroscopic techniques, we constructed spPV to sense sulfate, acetate, and perchlorate adsorption on coupled Au nanoparticles. spPV extends dynamic spectroelectrochemical sensing to the single-nanoparticle level using both individual plasmon resonance modes and total scattering intensity fluctuations.

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confidence: 80%

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confidence: 99%

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confidence: 99%

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Single-Particle Plasmon Voltammetry (spPV) for Detecting Anion Adsorption

et al. 2016

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“…In recent years, the combination of EC and surface plasmon resonance (EC-SPR) has become a powerful tool to study the surface chemical reaction process. The process is known as an oxidation–reduction reaction [ 2 , 15 ]. The recent report demonstrated that the optical, dielectric and electrochemical properties on the deposited metal film can be monitored in real time from the EC-SPR detection [ 16 , 17 ].…”

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confidence: 99%

Combination of Capped Gold Nanoslit Array and Electrochemistry for Sensitive Aqueous Mercuric Ions Detection

Chen

Wei

2021

Nanomaterials

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Label-free surface plasmon resonance (SPR) detection of mercuric ions in various aqueous solutions, using capped gold nanoslit arrays combined with electrochemical (EC) sensing technique, is demonstrated. The nanoslit arrays are fabricated on flexible cyclo-olefin polymer substrates by a nanoimprinting lithography method. The EC and SPR signals for the investigation of current responses and transmission SPR spectra are simultaneously measured during metal ions electrodeposition. Glycerol–water solution is studied to evaluate the resonant peak wavelength sensitivity (480.3 nm RIU−1) with a FOM of 40.0 RIU−1 and the obtained intensity sensitivity is 1819.9%. The ferrocyanide/ferricyanide redox couple performs the diffusion controlled electrochemical processes (R2 = 0.99). By investigating the SPR intensity changes and wavelength shifts of various mercuric ion concentrations, the optical properties are evaluated under chronoamperometric conditions. The sensors are evaluated in the detection range between 100 μM and 10 nM with a detection limit of 1 μM. The time dependence of SPR signals and the selectivity of 10 μM Hg2+ in the presence of 10 μM interfering metal ion species from Ca2+, Co2+, Ni2+, Na+, Cu2+, Pb2 + and Mn2+ are determined. The capped gold nanoslit arrays show the selectivity of Hg2+ and the EC sensing method is effectively utilized to aqueous Hg2+ detection. This study provides a label-free detection technique of mercuric ions and this developed system is potentially applicable to detecting chemicals and biomolecules.

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Surface-plasmon voltammetry using a gold grating

Cited by 2 publications

References 62 publications

Single-Particle Plasmon Voltammetry (spPV) for Detecting Anion Adsorption

Single-Particle Plasmon Voltammetry (spPV) for Detecting Anion Adsorption

Combination of Capped Gold Nanoslit Array and Electrochemistry for Sensitive Aqueous Mercuric Ions Detection

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