Optical Sensing with Simultaneous Electrochemical Control in Metal Nanowire Arrays

MacKenzie, Robert; Fraschina, Corrado; Sannomiya, Takumi; Auzelyté, Vaida; Vörös, János

doi:10.3390/s101109808

Cited by 15 publications

(9 citation statements)

References 47 publications

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“…[40][41][42][43] We have recently worked on implementing electrochemistry with various plasmonic nanostructures such as gold colloids 39 and gold nanowire arrays. 44 In this study, we perform high resolution spectroscopy 12,14 synchronized with CV scans using two other types of plasmonic nanostructures as working electrodes, namely gold nanodisks 13,14 fabricated on ITO 40 (supporting nanoparticle plasmons) and short-range ordered nanoholes in a thin gold film 12,22,40,45 (supporting surface plasmons). These structures are known in the plasmonics research field, but have not previously been combined with electrochemistry except in one recent study where we demonstrated electrochemical recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Nanoplasmonic sensing of metal–halide complex formation and the electric double layer capacitor

Dahlin

Zahn²,

Vörös³

2012

Nanoscale

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121

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Many nanotechnological devices are based on implementing electrochemistry with plasmonic nanostructures, but these systems are challenging to understand. We present a detailed study of the influence of electrochemical potentials on plasmon resonances, in the absence of surface coatings and redox active molecules, by synchronized voltammetry and spectroscopy. The experiments are performed on gold nanodisks and nanohole arrays in thin gold films, which are fabricated by improved methods. New insights are provided by high resolution spectroscopy and variable scan rates. Furthermore, we introduce new analytical models in order to understand the spectral changes quantitatively. In contrast to most previous literature, we find that the plasmonic signal is caused almost entirely by the formation of ionic complexes on the metal surface, most likely gold chloride in this study. The refractometric sensing effect from the ions in the electric double layer can be fully neglected, and the charging of the metal gives a surprisingly small effect for these systems. Our conclusions are consistent for both localized nanoparticle plasmons and propagating surface plasmons. We consider the results in this work especially important in the context of combined electrochemical and optical sensors.

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Section: Introductionmentioning

confidence: 99%

Nanoplasmonic sensing of metal–halide complex formation and the electric double layer capacitor

Dahlin

Zahn²,

Vörös³

2012

Nanoscale

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121

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“…The raw optical response data were normalized with the reference light. All scattering spectra were obtained at a specific potential value of 0.5 V (vs. Ag/AgCl) during the cathodic process (1.0 V → −0.2 V, vs. Ag/AgCl) in order to exclude the effects of applied potential and the direction of sweep on the scattering characteristics (Figure S3 in the Supplementary materials)24.…”

Section: Methodsmentioning

confidence: 99%

Real-Time Optical Monitoring of Pt Catalyst Under the Potentiodynamic Conditions

Song

Lee

Kim

et al. 2016

Sci Rep

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In situ monitoring of electrode materials reveals detailed physicochemical transition in electrochemical device. The key challenge is to explore the localized features of electrode surfaces, since the performance of an electrochemical device is determined by the summation of local architecture of the electrode material. Adaptive in situ techniques have been developed for numerous investigations; however, they require restricted measurement environments and provide limited information, which has impeded their widespread application. In this study, we realised an optics-based electrochemical in situ monitoring system by combining a dark-field micro/spectroscopy with an electrochemical workstation to investigate the physicochemical behaviours of Pt catalyst. We found that the localized plasmonic trait of a Pt-decorated Au nanoparticle as a model system varied in terms of its intensity and wavelength during the iterations of a cyclic voltammetry test. Furthermore, we show that morphological and compositional changes of the Pt catalyst can be traced in real time using changes in quantified plasmonic characteristics, which is a distinct advantage over the conventional electrochemistry-based in situ monitoring systems. These results indicate the substantial promise of online operando observation in a wide range of electrical energy conversion systems and electrochemical sensing areas.

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“…A positively charged polyethyleneimine (PEI) was then used to adhere the negatively charged DNA-coated gold particles to the substrate [22,23]. The final lift-off in acetone and water resulted in clearly defined particle lines that were not dense enough for electrical conduction [12,14]. The width of the lines is determined by lithography, but the height of the nanowire depends mainly on the size of the nanoparticles and the duration of subsequent gold enhancement.…”

Section: Methodsmentioning

confidence: 99%

Controlledin situnanoscale enhancement of gold nanowire arrays with plasmonics

MacKenzie¹,

Fraschina²,

Sannomiya³

et al. 2010

Nanotechnology

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The controlled in situ growth of ordered gold nanoparticles and nanowire arrays has been studied by optically tracking changes in the local surface plasmon resonance (LSPR) spectrum. A spectrometer and custom-programmed analysis software track changes in the LSPR spectrum. The peak position, peak height (i.e. extinction intensity) and peak width (e.g. radius of curvature) were tracked over time to quantify the dynamic growth of gold as soon as the system was exposed to a commercial gold enhancement solution. This enables the controlled dynamic growth of nano-objects without the necessity of characterizing the growth and aggregation kinetics of the gold enhancement solution. The result was the successful enhancement of their electrically conductive and plasmonic properties, as well as the controlled growth and transformation of line-patterned nanoparticles into conductive particle-based nanowires.

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Optical Sensing with Simultaneous Electrochemical Control in Metal Nanowire Arrays

Cited by 15 publications

References 47 publications

Nanoplasmonic sensing of metal–halide complex formation and the electric double layer capacitor

Nanoplasmonic sensing of metal–halide complex formation and the electric double layer capacitor

Real-Time Optical Monitoring of Pt Catalyst Under the Potentiodynamic Conditions

Controlledin situnanoscale enhancement of gold nanowire arrays with plasmonics

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