Characterization of ionic transport at the nanoscale

Prakash, Shaurya; Yeom, Junghoon; Jin, Niu; Adesida, I.; Shannon, Mark A.

doi:10.1243/17403499jnn91

Cited by 12 publications

(9 citation statements)

References 29 publications

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“…Oxygen plasma bonding is also used for devices where fluidic channels are fabricated in PDMS and a glass top cover is bonded to the device [25,26]. In some cases, the use of adhesive layers has also been used to bond devices [123,158].…”

Section: (Iii) Other Bonding Techniquesmentioning

confidence: 99%

Theory, fabrication and applications of microfluidic and nanofluidic biosensors

Prakash

Pinti

Bhushan

2012

Phil. Trans. R. Soc. A.

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Biosensors are a broad array of devices that detect the type and amount of a biological species or biomolecule. Several different types of biosensors have been developed that rely on changes to mechanical, chemical or electrical properties of the transduction or sensing element to induce a measurable signal. Often, a biosensor will integrate several functions or unit operations such as sample extraction, manipulation and detection on a single platform. This review begins with an overview of the current state-of-the-art biosensor field. Next, the review delves into a special class of biosensors that rely on microfluidics and nanofluidics by presenting the underlying theory, fabrication and several examples and applications of microfluidic and nanofluidic sensors.

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Section: (Iii) Other Bonding Techniquesmentioning

confidence: 99%

Theory, fabrication and applications of microfluidic and nanofluidic biosensors

Prakash

Pinti

Bhushan

2012

Phil. Trans. R. Soc. A.

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“…The nanoporous alumina (NPAs) prepared by an electrochemical anodization process have been very attractive for the development of nanopore biosensing devices, due to their uniform pore size, high aspect ratio, high surface area and straightforward and inexpensive fabrication. It has been demonstrated that the electron transfer resistance will decrease and the conductance increase as a result of an ion transfer inside the pores of NPA [ 14 , 15 ]. Previous studies demonstrated that the transport of ions or molecules passing through nanopore nanochannels is affected by steric and electrostatic effects [ 16 – 18 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Nanopore Dimensions on the Electrochemical Properties of Nanopore Arrays Studied by Impedance Spectroscopy

Kant

Priest

Shapter

et al. 2014

Sensors

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The understanding of the electrochemical properties of nanopores is the key factor for better understanding their performance and applications for nanopore-based sensing devices. In this study, the influence of pore dimensions of nanoporous alumina (NPA) membranes prepared by an anodization process and their electrochemical properties as a sensing platform using impedance spectroscopy was explored. NPA with four different pore diameters (25 nm, 45 nm and 65 nm) and lengths (5 μm to 20 μm) was used and their electrochemical properties were explored using different concentration of electrolyte solution (NaCl) ranging from 1 to 100 μM. Our results show that the impedance and resistance of nanopores are influenced by the concentration and ion species of electrolytes, while the capacitance is independent of them. It was found that nanopore diameters also have a significant influence on impedance due to changes in the thickness of the double layer inside the pores.

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“…Electrochemical measurement in small volumes has been aided with the development of microfabricated electrodes. − Traditionally, however, microelectrodes for in vivo work consist of microwires encased in a pulled glass capillary which, when polished, results in an inlaid microdisk electrode. In fact, for the smallest diameter nanoelectrodes, this technique is often the only way by which such electrodes can be made.…”

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confidence: 99%

Electrochemistry in an Acoustically Levitated Drop

2013

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Levitated drops show potential as microreactors, especially when radicals are present as reactants or products. Solid/liquid interfaces are absent or minimized, avoiding adsorption and interfacial reaction of conventional microfluidics. We report amperometric detection in an acoustically levitated drop with simultaneous ballistic addition of reactant. A gold microelectrode sensor was fabricated with a lithographic process; active electrode area was defined by a photosensitive polyimide mask. The microdisk gold working electrode of radius 19 μm was characterized using ferrocenemethanol in aqueous buffer. Using cyclic voltammetry, the electrochemically active surface area was estimated by combining a recessed microdisk electrode model with the Randles-Sevcik equation. Computer-controlled ballistic introduction of reactant droplets into the levitated drop was developed. Chronoamperometric measurements of ferrocyanide added ballistically demonstrate electrochemical monitoring using the microfabricated electrode in a levitated drop. Although concentration increases with time due to drop evaporation, the extent of concentration is predictable with a linear evaporation model. Comparison of diffusion-limited currents in pendant and levitated drops show that convection arising from acoustic levitation causes an enhancement of diffusion-limited current on the order of 16%.

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Characterization of ionic transport at the nanoscale

Cited by 12 publications

References 29 publications

Theory, fabrication and applications of microfluidic and nanofluidic biosensors

Theory, fabrication and applications of microfluidic and nanofluidic biosensors

The Influence of Nanopore Dimensions on the Electrochemical Properties of Nanopore Arrays Studied by Impedance Spectroscopy

Electrochemistry in an Acoustically Levitated Drop

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