Chemiresistive nanosensors with convex/concave structures

Chen, Songyue; Tang, Yongliang; Zhan, Kan; Sun, Di; Hou, Xu

doi:10.1016/j.nantod.2018.04.006

Cited by 69 publications

(41 citation statements)

References 241 publications

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“…1,2 Inspired by the structure and function of protein channels, researchers began to prepare articial nanochannels to mimic natural channels for biosensing, energy conversion, and smart gating. [3][4][5][6] Organic polyethylene terephthalate (PET) conical channels and inorganic AAO nanochannel arrays are the most widely studied. [7][8][9][10][11][12] Until now, one of the most important discoveries in the eld of electrolyte ion transport by articial solid nanochannels is the unidirectional ion rectication characteristics that originate from asymmetric systems.…”

Section: Introductionmentioning

confidence: 99%

A high rectification ratio nanofluidic diode induced by an “ion pool”

Liu

You

et al. 2020

RSC Adv.

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Inspired by functionalized biological ion channels, artificial channels were prepared to mimic the natural ones. The key concept behind the rectifying phenomena in nanochannels is the construction of asymmetric restrictive nanochannels. Here, we prepared nanoporous oxidized polyvinyl alcohol (PVA) and WO 3 composite coatings on hourglass-shaped anodic aluminum oxide (AAO) nanochannel surfaces. Accordingly, a special "ion pool" is formed between the homogeneous junction in the middle of the AAO and the nanoporous PVA/WO 3 film-covered AAO surface and its two ends are greatly nano-confined.Ion enrichment and ion depletion occur in the "ion pool" and are dependant on the applied voltage polarity. A rectification ratio of 458, which is in accordance with the highest value found in previous reports, was obtained from the cooperative effects of the two small open ends of the "ion pool". Furthermore, this value is enhanced to about 2000 under constant voltage. An excellent pH-sensitive rectification property, with a single rectification direction from acidic to basic conditions, has also been demonstrated. † Electronic supplementary information (ESI) available: SEM image of the middle region of the hourglass-shaped AAO; SEM of the cross section of the oxidized PVA modied hourglass-shaped AAO openings; histogram of rectication ratio calculated from the I-V curves of AAO-PVA in different KCl concentration. See

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Section: Introductionmentioning

confidence: 99%

A high rectification ratio nanofluidic diode induced by an “ion pool”

Liu

You

et al. 2020

RSC Adv.

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“…[3] Motivated by these ingenious structures in geometry and composition, creation of artificial nanochannels with asymmetric aperture and surface charge has been emerging as a promising candidate for researching ion transport properties and capturing salinity-gradient energy. [4][5][6][7][8] Ion transport through confined nanochannel with a unique length scale, usually within the scope of 1-100 nm, shows marked difference to the bulk solution. [9] The combination of strong dimension confinement and surface charge effect contributes to some unique characters, including ion selectivity, ion rectification, and ion gating.…”

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confidence: 99%

Fabrication of Bio‐Inspired 2D MOFs/PAA Hybrid Membrane for Asymmetric Ion Transport

Wang

Liu

Tan

et al. 2019

Adv Funct Materials

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Biological ion channels are known as membrane proteins which can turn on and off under environmental stimulus to regulate ion transport and energy conversion. Rapid progress made in biological ion channels provides inspiration for developing artificial nanochannels to mimic the structures and functions of ion transport systems and energy conversion in biological ion channels. Due to the advantages of abundant pore channels, metal–organic frameworks (MOFs) have become competitive materials to control the nanofluidic transport. Herein, a facile in situ synthesis method is developed to prepare hybrid nanochannels constructed by 2D MOFs and porous anodic aluminum (PAA). The introduction of asymmetries in the chemical composition and surface charge properties gives the hybrid outstanding ion current rectification properties and excellent ion selectivity. A power density of 1.6 W m−2 is achieved by integrating it into a salinity‐gradient‐driven device. With advantages of facile fabrication method and high ion selectivity, the prepared 2D MOFs/PAA hybrid membrane offers a promising candidate for power conversion and water desalination.

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“…The surface charge measurement in liquid can be realized with solid-state nanopore sensors, including polymer nanopores and inorganic nanopores or nanochannels [2]. Nanopores take advantage of the electrostatic effects inside nano-confined space in the presence of surface charges, which gives them high sensitivity and new sensing mechanisms [82].…”

Section: Surface Charge Measurementmentioning

confidence: 99%

Surface Potential/Charge Sensing Techniques and Applications

Chen

Dong

Yang

2020

Sensors

Self Cite

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Surface potential and surface charge sensing techniques have attracted a wide range of research interest in recent decades. With the development and optimization of detection technologies, especially nanosensors, new mechanisms and techniques are emerging. This review discusses various surface potential sensing techniques, including Kelvin probe force microscopy and chemical field-effect transistor sensors for surface potential sensing, nanopore sensors for surface charge sensing, zeta potentiometer and optical detection technologies for zeta potential detection, for applications in material property, metal ion and molecule studies. The mechanisms and optimization methods for each method are discussed and summarized, with the aim of providing a comprehensive overview of different techniques and experimental guidance for applications in surface potential-based detection.

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Chemiresistive nanosensors with convex/concave structures

Cited by 69 publications

References 241 publications

A high rectification ratio nanofluidic diode induced by an “ion pool”

A high rectification ratio nanofluidic diode induced by an “ion pool”

Fabrication of Bio‐Inspired 2D MOFs/PAA Hybrid Membrane for Asymmetric Ion Transport

Surface Potential/Charge Sensing Techniques and Applications

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