Electroactive Nanotube Membranes and Redox‐Gating

Büyükserin, Fatih; Kohli, Punit; Wirtz, Marc; Martin, Charles R.

doi:10.1002/smll.200600477

Cited by 24 publications

(11 citation statements)

References 26 publications

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“…2,3 Many groups have successfully leveraged a variety of responsive chemistries to alter the surface charge, and resulting ion transport, through a nanoporous membrane. [4][5][6][7][8][9] Moreover, different ion transport behavior can be achieved through control of the nanopore shape. For example, cones can give rise to different degrees of ion rectifying behaviors normally absent in simple cylindrical nanopores, an important factor for overall control of ion transport in the membranes.…”

Section: Introductionmentioning

confidence: 99%

Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes

et al. 2018

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Section: Introductionmentioning

confidence: 99%

Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes

et al. 2018

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“…In this vein, many approaches have been employed, including transistor-like devices, voltageinduced dewetting, and attachment of single electron transfer redox molecules, such as ferrocene, to the nanopore walls. [14][15][16][17] While these approaches have successfully controlled ion flow through nanopores, all require a constant applied voltage to maintain ionic transport properties.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous membranes with electrochemically switchable, chemically stabilized ionic selectivity

2015

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Nanopore size, shape, and surface charge all play important roles in regulating ionic transport through nanoporous membranes. The ability to control these parameters in situ provides a means to create ion transport systems tunable in real time. Here, we present a new strategy to address this challenge, utilizing three unique electrochemically switchable chemistries to manipulate the terminal functional group and control the resulting surface charge throughout ensembles of gold plated nanopores in ion-tracked polycarbonate membranes 3 cm(2) in area. We demonstrate the diazonium mediated surface functionalization with (1) nitrophenyl chemistry, (2) quinone chemistry, and (3) previously unreported trimethyl lock chemistry. Unlike other works, these chemistries are chemically stabilized, eliminating the need for a continuously applied gate voltage to maintain a given state and retain ionic selectivity. The effect of surface functionalization and nanopore geometry on selective ion transport through these functionalized membranes is characterized in aqueous solutions of sodium chloride at pH = 5.7. The nitrophenyl surface allows for ionic selectivity to be irreversibly switched in situ from cation-selective to anion-selective upon reduction to an aminophenyl surface. The quinone-terminated surface enables reversible changes between no ionic selectivity and a slight cationic selectivity. Alternatively, the trimethyl lock allows ionic selectivity to be reversibly switched by up to a factor of 8, approaching ideal selectivity, as a carboxylic acid group is electrochemically revealed or hidden. By varying the pore shape from cylindrical to conical, it is demonstrated that a controllable directionality can be imparted to the ionic selectivity. Combining control of nanopore geometry with stable, switchable chemistries facilitates superior control of molecular transport across the membrane, enabling tunable ion transport systems.

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“…The first attempts to control the passage of ions through nanopores using redox tunable groups were reported by Martin and his coworkers. 66 These authors convincingly demonstrated that the decoration of nanochannels with redox-active ferrocene moieties permits the electro-modulated selective transport of cations through the nanofluidic device.…”

Section: Environmental Signals That Trigger Nanogating Processes In Nmentioning

confidence: 98%

Bioinspired integrated nanosystems based on solid-state nanopores: “iontronic” transduction of biological, chemical and physical stimuli

et al. 2017

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Electroactive Nanotube Membranes and Redox‐Gating

Cited by 24 publications

References 26 publications

Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes

Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes

Nanoporous membranes with electrochemically switchable, chemically stabilized ionic selectivity

Bioinspired integrated nanosystems based on solid-state nanopores: “iontronic” transduction of biological, chemical and physical stimuli

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