Electrochemical behavior of a gold nanoring electrode microfabricated on a silicon micropillar

Yin, Haocheng; Tan, Chao; Siddiqui, Shabnam; Arumugam, Prabhu U.

doi:10.1016/j.snb.2018.10.097

Cited by 8 publications

(11 citation statements)

References 58 publications

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“…From the seminal work on steady-state mass transport to microdisk electrodes by Fleischmann and Pons, , the AC-impedance response of numerous electrochemical microsystems has been studied, including for fiber or square microelectrodes, for microelectrode arrays, , and for tubular electrodes used for photocatalysis applications . Because of their small dimensions, any defect in the geometry of the electrodes may result in modification of the electrochemical response.…”

Section: Description Of Electrochemical Impedancementioning

confidence: 99%

Impedance Analysis of Electrochemical Systems

2022

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Interpretation of impedance spectroscopy data requires both a description of the chemistry and physics that govern the system and an assessment of the error structure of the measurement. The approach presented here includes use of graphical methods to guide model development, use of a measurement model analysis to assess the presence of stochastic and bias errors, and a systematic development of interpretation models in terms of the proposed reaction mechanism and physical description. Application to corrosion, batteries, and biological systems is discussed, and emerging trends in interpretation and implementation of impedance spectroscopy are presented.

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Section: Description Of Electrochemical Impedancementioning

confidence: 99%

Impedance Analysis of Electrochemical Systems

2022

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“…Hence the miniaturized working electrode is usually regarded as a core component, of which the characteristic is directly related to the performance of the whole μEDS system. In previous researches, most of the microelectrodes were designed into a simple two-dimensional (2D) planar band [ 10 ], disk [ 11 , 12 ], ring [ 13 ] or slightly more complicated shapes such as hemisphere [ 14 ], cylinder [ 15 ] and ring [ 16 ]. Besides these conventional configurations, the three-dimensional (3D) microelectrodes array (μAE) has received comprehensive attention since it can provide a much larger surface area and lead to higher response current [ 17 ], lower impedance [ 18 ] and limit of detection [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Performance of Micropillar Array Electrodes in Microflows

Liu

Chen

et al. 2020

Micromachines

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The microchip-based electrochemical detection system (μEDS) has attracted plenty of research attention due to its merits including the capability in high-density integration, high sensitivity, fast analysis time, and reduced reagent consumption. The miniaturized working electrode is usually regarded as the core component of the μEDS, since its characteristic directly determines the performance of the whole system. Compared with the microelectrodes with conventional shapes such as the band, ring and disk, the three-dimensional (3D) micropillar array electrode (μAE) has demonstrated significant potential in improving the current response and decreasing the limits of detection due to its much larger reaction area. In this study, the numerical simulation method was used to investigate the performance of the μEDS, and both the geometrical and hydrodynamic parameters, including the micropillars shape, height, arrangement form and the flow rate of the reactant solution, were taken into consideration. The tail effect in μAEs was also quantitatively analyzed based on a pre-defined parameter of the current density ratio. In addition, a PDMS-based 3D μAE was fabricated and integrated into the microchannel for the electrochemical detection. The experiments of cyclic voltammetry (CV) and chronoamperometry (CA) were conducted, and a good agreement was found between the experimental and simulation results. This study would be instructive for the configuration and parameters design of the μEDS, and the presented method can be adopted to analyze and optimize the performance of nanochip-based electrochemical detection system (nEDS).

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“…Arumugam reported the fabrication of a 165 nm wide annular-shaped nanoband "Au nanoring electrode" (Au NRE) patterned on top of a 4.6 μm diameter and 17.0 μm long Si micropillar. 53 They used a multistep process With the last finetuning etching step deemed the most critical step. The fabricated electrodes were checked by CV and etched further until an appropriate steady-state CV was reached.…”

Section: Microelectrode and Nanoelectrode Fabrication Methodsmentioning

confidence: 99%

Review—Micro/Nanoelectrodes and Their Use in Electrocrystallization: Historical Perspective and Current Trends

Mao

Kilani

Ahmed

2022

J. Electrochem. Soc.

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Crystallization is at the heart of many industrial processes in pharmaceuticals, dyes and pigments, microelectronics, and emerging wearable sensors. This paper reviews nucleation and early-stage crystal growth activated by an electrical pulse at microelectrodes and nanoelectrodes. We review thermodynamic and kinetic theories of electrochemistry developed around microelectrodes. We describe various methods to make microelectrodes and nanoelectrodes. Fundamental understanding is still needed for predicting and controlling nucleation and early-stage crystal growth. Using nanoelectrodes, nucleation and growth kinetics can be studied on one nucleation site at a time. In contrast, on macroelectrodes, nanoparticles are nucleated at random sites and at different times. This gives rise to overlapping growth zones resulting in inhomogeneous particle deposition and growth. The random size and density distributions prevent electrodeposition from being widely adopted as a manufacturing tool for making nanodevices. We describe advances in electrodeposition of metal nanoparticles and organic charge-transfer complexes on micro/nanoelectrodes. We anticipate increased interests in applying electrochemistry for making nanodevices particularly nanosensors and nanosensor arrays. These electrochemically fabricated nanosensor arrays will in turn fulfill the promise of nanoelectrodes as the most advanced analytical tools for medical diagnostics, environmental monitoring, and renewable energy.

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Electrochemical behavior of a gold nanoring electrode microfabricated on a silicon micropillar

Cited by 8 publications

References 58 publications

Impedance Analysis of Electrochemical Systems

Impedance Analysis of Electrochemical Systems

Electrochemical Performance of Micropillar Array Electrodes in Microflows

Review—Micro/Nanoelectrodes and Their Use in Electrocrystallization: Historical Perspective and Current Trends

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