Photo-switchable two-dimensional nanofluidic ionic diodes

Wang, Lili; Feng, Yining; Zhou, Yi; Jia, Meijuan; Wang, Guojie; Guo, Wei; Jiang, Lei

doi:10.1039/c7sc00153c

Cited by 53 publications

(58 citation statements)

References 49 publications

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“…Their common property (that distinguishes them from micropores) is that their radii are smaller than (or similar in size to) the characteristic screening length of the electrolyte (NaCl in this study) that fills the channel. The dimensionality of these systems makes them central building blocks of devices for various applications from DNA sequencing [48] through switches [49] to chemical and biosensing [50,51,52,53]. Rectification appears (and the nanopore can be called a nanofluidic diode) if the nanopore is asymmetrical in geometry (e.g.…”

Section: Questionsmentioning

confidence: 99%

Multiscale modeling of a rectifying bipolar nanopore: explicit-water versus implicit-water simulations

Ható

Valiskó

Kristóf

et al. 2017

Phys. Chem. Chem. Phys.

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In a multiscale modeling approach, we present computer simulation results for a rectifying bipolar nanopore at two modeling levels. In an all-atom model, we use explicit water to simulate ion transport directly with the molecular dynamics technique. In a reduced model, we use implicit water and apply the Local Equilibrium Monte Carlo method together with the Nernst-Planck transport equation. This hybrid method makes the fast calculation of ion transport possible at the price of lost details. We show that the implicit-water model is an appropriate representation of the explicit-water model when we look at the system at the device (i.e., input vs. output) level. The two models produce qualitatively similar behavior of the electrical current for different voltages and model parameters. Looking at the details of concentration and potential profiles, we find profound differences between the two models. These differences, however, do not influence the basic behavior of the model as a device because they do not influence the z-dependence of the concentration profiles which are the main determinants of current. These results then address an old paradox: how do reduced models, whose assumptions should break down in a nanoscale device, predict experimental data? Our simulations show that reduced models can still capture the overall device physics correctly, even though they get some important aspects of the molecular-scale physics quite wrong; reduced models work because they include the physics that is necessary from the point of view of device function. Therefore, reduced models can suffice for general device understanding and device design, but more detailed models might be needed for molecular level understanding.

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Section: Questionsmentioning

confidence: 99%

Multiscale modeling of a rectifying bipolar nanopore: explicit-water versus implicit-water simulations

Ható

Valiskó

Kristóf

et al. 2017

Phys. Chem. Chem. Phys.

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“…Atomically thin water film was considered as n-type dopant while trapped water droplet acted as p-type dopant [29]. In recent years, 2D nanofluidics consisting of stacked 2D materials have been reported for energy conversion, water treatment and ion transport manipulation [35][36][37][38][39][40]. In the 2D nanofluidics, the charge density and membrane structure asymmetry could be influenced by confined adsorbates between 2D materials, resulting in enhanced ionic current rectification.…”

Section: Introductionmentioning

confidence: 99%

The influence of two-dimensional organic adlayer thickness on the ultralow frequency Raman spectra of transition metal dichalcogenide nanosheets

Shi

Liu

et al. 2018

Sci. China Mater.

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Recently, it has been reported that physisorbed adsorbates can be trapped between the bottom surface of twodimensional (2D) materials and supported substrate to form 2D confined films. However, the influence of such 2D confined adsorbates on the properties of 2D materials is rarely explored. Herein, we combined atomic force microscopy (AFM), Kelvin probe force microscopy (KPFM) and Raman spectroscopy especially the ultralow frequency (ULF) Raman spectroscopy to explore the influence of 2D confined organic adlayer thickness on the ULF breathing modes of few-layer MoS 2 and WSe 2 nanosheets. As the thickness of organic adlayers increased, red shift, coexistence of blue and red shifts as well as blue shift of ULF breathing mode was observed. KPFM measurement confirmed the enhanced n-doping and p-doping behaviors of organic adlayers as their thickness increased, respectively. Our results will provide new insights into the interaction between 2D confined adsorbates and bottom surface of 2D nanosheets, which could be useful for modulating properties of 2D materials.

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“…For example, besides regular 2D nanomaterials, 2D zeolites, metal-organic framework nanosheets, and layered mineral materials are expected to be used in the fabrication of nanofluidic devices for energyrelated applications. [68][69][70] Furthermore, versatile responsiveness and adaptiveness, [71] as well as other asymmetric ion-transport behaviors, [72] can be built into 2D nanofluidic systems. From a technical view, mass production of high-quality 2D nanofluidic materials still meets challenges.…”

Section: Discussionmentioning

confidence: 99%

Bioinspired Energy Conversion in Nanofluidics: A Paradigm of Material Evolution

et al. 2017

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fly. Many of the well-developed structurefunction relationships in biological systems have become the inspiration for the design and application of innovative materials. [2,3] This bioinspired learning process accelerates the continuous evolution of novel man-made materials, circumventing many of the previously insurmountable challenges in, for example, architecture, aerodynamics, and materials science, etc. [4] More intriguingly, by adopting various design strategies from different natural inspirations, synthetic materials and devices keep on evolving and gaining more functions. Taking the development of aircraft for example, the wing curve of the prototype airplane mimics the streamlined shape of bird wings so as to reduce aerodynamic drag. The bat uses supersonic-based pathfinding to avoid obstacles when flying at night. Learning from this skill, modern aircraft use radar navigation systems as their "eyes". The adaptive surface coatings of aircraft mimic the micro-and nanostructures of shark skin, which greatly reduces frictional resistance, saving fuel and preventing damage from ultraviolet irradiation. As human beings constantly get new inspiration from nature, the evolution of bioinspired materials never stops.Research in nanofluidic energy conversion is enlightened by the electrogenic cells that convert transmembrane ion-concentration gradients into the release of electrical impulses by membrane-protein-regulated ion transport through the hierarchically arranged ion channels and ion pumps. [5] One particular example is electric eels (Electrophorus electricus), which are capable of generating electric shocks up to 600 V for predation and self-defense (Figure 1). Toward this goal, one research direction is to build synthetic nanofluidic devices with a minimum set of components, yet can mimic the biological energyconversion process on the nanoscale. [6] Another research direction is the multiscale integration of individual nanofluidic devices into macroscopic materials for practical use. [7] Here, we present an overview of the structural and functional evolution in synthetic one-dimensional (1D) and two-dimensional (2D) nanofluidic systems under the guidance of three different types of biological inspiration: the asymmetric ion-transport behaviors of biological ion channels, the strong bioelectric function of electric eels, and the layered microstructure of nacre. The progress, challenges, and future perspectives in this growing field are highlighted.Well-developed structure-function relationships in living systems have become inspirations for the design and application of innovative materials. Building artificial nanofluidic systems for energy conversion undergoes three essential steps of structural and functional development with the uptake of separate biological inspirations. This research field started from the mimicking of the bioelectric function of electric eels, wherein a transmembrane ion concentration gradient is converted into ultrastrong electrical impulses via membrane-protein-regulated ion tran...

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Photo-switchable two-dimensional nanofluidic ionic diodes

Abstract: 2D nanofluidic systems are endowed with photo-responsive ionic rectification by asymmetric modification with spiropyran. Structural and photo-induced charge heterostructures result in smart 2D ionic rectifiers with a maximum rectification ratio of 48.

Cited by 53 publications

References 49 publications

Multiscale modeling of a rectifying bipolar nanopore: explicit-water versus implicit-water simulations

Multiscale modeling of a rectifying bipolar nanopore: explicit-water versus implicit-water simulations

The influence of two-dimensional organic adlayer thickness on the ultralow frequency Raman spectra of transition metal dichalcogenide nanosheets

Bioinspired Energy Conversion in Nanofluidics: A Paradigm of Material Evolution

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