Sub-10 nm transparent all-around-gated ambipolar ionic field effect transistor

Lee, Seung–Hyun; Lee, Hyomin; Jin, Tianguang; Park, Sung Min; Yoon, Byung Jun; Sung, Gun Yong; Kim, Ki-Bum; Kim, Sung Jae

doi:10.1039/c4nr04089a

Cited by 40 publications

(39 citation statements)

References 38 publications

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“…Recently, the nanofluidic field effect transistor (FET) [20][21][22], comprising a gate electrode embedded beneath the thin dielectric channel layer, has been developed. It has been demonstrated that the FET is capable of actively controlling the surface charge property and ionic conductance in a solid-state nanochannel and nanopore by controlling the gate voltage applied to the gate electrode 4 [23][24][25][26][27][28][29][30][31][32][33][34]. Compared to the large number of studies on the solid-state nanofluidic FET, Benson et al [35] and Milne et al [36] recently initiated the studies of the FET control of the Donnan potential, the electrical potential at the PE layer/solid channel interface [37], and the electrokinetic flow (EKF) in the functionalized soft nanochannels.…”

Section: Introductionmentioning

confidence: 99%

Gated ion transport in a soft nanochannel with biomimetic polyelectrolyte brush layers

Zhou

Mei

et al. 2016

Sensors and Actuators B: Chemical

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Functionalized nanofluidics has recently emerged as a powerful platform for applications of energy conversion as well as ionic diodes. Inspired by biological cells, we theoretically investigate for the first time the gate modulation of ion transport and selectivity in the soft nanochannel functionalized with biomimetic, pH-tunable, zwitterionic polyelectrolyte (PE) brush layers. The gate effect on the modulation of Donnan potential, ionic conductance, and ion selectivity in the biomimetic soft nanochannel is remarkable when the background salt concentration is low, pH is close to the isoelectric point of PE brush layers (slightly acidic), and the grafting density of PE brushes on the channel wall is small. Under those conditions, the biomimetic gated soft nanochannel is capable of being highly cation-selective when a negative gate voltage is applied. The findings provide a novel way for designing nanofluidic devices used in osmotic energy conversion and ion current rectification.

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Section: Introductionmentioning

confidence: 99%

Gated ion transport in a soft nanochannel with biomimetic polyelectrolyte brush layers

Zhou

Mei

et al. 2016

Sensors and Actuators B: Chemical

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“…[13][14][15][16][17] Elucidating the fundamentals of ion transportation also remains an active research area because various related phenomena are not fully understood yet. Ion concentration polarization (ICP) is a representative phenomenon of such novel ion transport in a nanoscale fluidic device, usually driven by an external electric field.…”

Section: Introductionmentioning

confidence: 99%

Capillarity ion concentration polarization for spontaneous biomolecular preconcentration mechanism

Lee

Son

et al. 2016

Biomicrofluidics

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Ionic hydrogel-based ion concentration polarization devices have been demonstrated as platforms to study nanoscale ion transport and to develop engineering applications, such as protein preconcentration and ionic diodes/transistors. Using a microfluidic system composed of a perm-selective hydrogel, we demonstrated a micro/nanofluidic device for the preconcentration of biological samples using a new class of ion concentration polarization mechanism called "capillarity ion concentration polarization" (CICP). Instead of an external electrical voltage source, the capillary force of the perm-selective hydrogel spontaneously generated an ion depletion zone in a microfluidic channel by selectively absorbing counter-ions in a sample solution. We demonstrated a reasonable preconcentration factor ($100-fold/min) using the CICP device. Although the efficiency was lower than that of conventional electrokinetic ICP operation due to the absence of a drift ion migration, this mechanism was free from the undesirable instability caused by a local amplified electric field inside the ion depletion zone so that the mechanism should be suitable especially for an application where the contents were electrically sensitive. Therefore, this simple system would provide a point-of-care diagnostic device for which the sample volume is limited and a simplified sample handling is demanded. V C 2016 AIP Publishing LLC. [http://dx

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“…Typical behaviour is that the ion concentration becomes extremely low at an anodic side (referred to as an ion-depletion zone) and enriches at a cathodic side (referred to as an ion-enrichment zone) in the case of a cation-selective membrane. Although the mechanism involves complex interactions of electric fields and electrokinetic flows 35 36 37 , the eye-catching fact in terms of engineering applications is that ICP can play as an electrical filter. This virtual barrier rejects the entrance of charged species into the ion-depletion zone, so that it can be utilized as a water desalination/purification mechanism 2 38 and a biomolecular preconcentration mechanism 24 25 .…”

Section: Resultsmentioning

confidence: 99%

Capillarity ion concentration polarization as spontaneous desalting mechanism

et al. 2016

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To overcome a world-wide water shortage problem, numerous desalination methods have been developed with state-of-the-art power efficiency. Here we propose a spontaneous desalting mechanism referred to as the capillarity ion concentration polarization. An ion-depletion zone is spontaneously formed near a nanoporous material by the permselective ion transportation driven by the capillarity of the material, in contrast to electrokinetic ion concentration polarization which achieves the same ion-depletion zone by an external d.c. bias. This capillarity ion concentration polarization device is shown to be capable of desalting an ambient electrolyte more than 90% without any external electrical power sources. Theoretical analysis for both static and transient conditions are conducted to characterize this phenomenon. These results indicate that the capillarity ion concentration polarization system can offer unique and economical approaches for a power-free water purification system.

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Sub-10 nm transparent all-around-gated ambipolar ionic field effect transistor

Abstract: A versatile ionic field effect transistor (IFET) which has an ambipolar function for manipulating molecules regardless of their polarity was developed for the operation at a wide range of electrolytic concentrations (10−5 M–1 M).

Cited by 40 publications

References 38 publications

Gated ion transport in a soft nanochannel with biomimetic polyelectrolyte brush layers

Gated ion transport in a soft nanochannel with biomimetic polyelectrolyte brush layers

Capillarity ion concentration polarization for spontaneous biomolecular preconcentration mechanism

Capillarity ion concentration polarization as spontaneous desalting mechanism

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