Hybrid van der Waals heterostructures of zero-dimensional and two-dimensional materials

Zheng, Zhikun; Zhang, Xianghui; Neumann, Christof; Emmrich, Daniel; Winter, Andreas; Vieker, Henning; Liu, Wei; Lensen, Marga C.; Turchanin, Andrey

doi:10.1039/c5nr03475b

Cited by 26 publications

(22 citation statements)

References 42 publications

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“…[5g,30] The NBPT membrane has two distinct faces possessing amino‐ and thiol‐ groups, which can be chemically functionalized independently . It is worth noting that chemical functionalization does not lead to a change in the integral structure of the membrane; thus, the initial mechanical properties are retained . Moreover, the thickness and Young's moduli of such CNMs can vary from ≈0.5 nm to ≈3 nm and ≈9–19 GPa, respectively, depending on the selection of the precursor monomers for the formation of SAMs ( Figure ).…”

Section: Synthesis Structure and Mechanical Properties Of 2dmsmentioning

confidence: 99%

Synthetic Two‐Dimensional Materials: A New Paradigm of Membranes for Ultimate Separation

2016

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Microporous membranes act as selective barriers and play an important role in industrial gas separation and water purification. The permeability of such membranes is inversely proportional to their thickness. Synthetic two-dimensional materials (2DMs), with a thickness of one to a few atoms or monomer units are ideal candidates for developing separation membranes. Here, groundbreaking advances in the design, synthesis, processing, and application of 2DMs for gas and ion separations, as well as water desalination are presented. This report describes the syntheses, structures, and mechanical properties of 2DMs. The established methods for processing 2DMs into selective permeation membranes are also discussed and the separation mechanism and their performances addressed. Current challenges and emerging research directions, which need to be addressed for developing next-generation separation membranes, are summarized.

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Section: Synthesis Structure and Mechanical Properties Of 2dmsmentioning

confidence: 99%

Synthetic Two‐Dimensional Materials: A New Paradigm of Membranes for Ultimate Separation

2016

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“…b: 1b) the terminal nitro groups (‐NO 2 ) are reduced into amino groups (‐NH 2 ) upon their crosslinking with electrons or with high energy photons . The presence of functional terminal groups on the surfaces of the formed CNMs, NH 2 ‐ termination on one face and S‐termination (thiols, disulfides, sulfonic group) on the other face, enables rather sophisticated chemical functionalization of these nanosheets with both organic and inorganic low dimensional materials . Note that in contrast to graphene oxide (GO) sheets, where functional groups lack of the specificity, in CNMs the functional groups are well defined enabling the engineering of complex organic of inorganic‐organic heterostructures …”

Section: Conversion Of Aromatic Sams Into Cnmsmentioning

confidence: 99%

“…d, this effect is due the reduced influence of the inhomogeneous charged impurities, which are partially screened in the dielectric CNM and is reminiscent to the influence hBN sheets used for the encapsulated graphene devices. As the NH 2 ‐CNM/graphene hybrid FETs provide a variety of possibilities for complex non‐destructive chemical and biochemical functionalization, the suggested device concept opens up a manifold of technologically relevant routes for graphene applications in chemical, electrochemical and biological sensors based on both electrical, electro‐mechanical or optical readouts.…”

Section: Chemical Functionalization Of Graphene Fets With Cnmsmentioning

confidence: 99%

Graphene Growth by Conversion of Aromatic Self‐Assembled Monolayers

Turchanin

2017

Annalen der Physik

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Despite present diversity of graphene production methods there is still a high demand for improvement of the existing production schemes or development of new. Here a method is reviewed to produce graphene employing aromatic self-assembled monolayers (SAMs) as molecular precursors. This method is based on electron irradiation induced crosslinking of aromatic SAMs resulting in their conversion into carbon nanomembranes (CNMs) with high thermal stability and subsequent pyrolysis of CNMs into graphene in vacuum or in the inert atmosphere. Depending on the production conditions, such as chemical structure of molecular precursors, irradiation and annealing parameters, various properties of the produced graphene sheets including shape, crystallinity, thickness, optical properties and electric transport can be adjusted. The assembly of CNM/graphene van der Waals heterostructures opens a flexible route to non-destructive chemical functionalization of graphene for a variety of applications in electronic and photonic devices.

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“…[22][23][24][25] CNMs can be synthesized by electron irradiation induced cross-linking of aromatic self-assembled monolayers (SAMs) on a large scale, [23] with tunable thickness [24] and porosity [24,26] and allow chemical functionalization [27,28] as well as gas and ion permeation [29,30] , etc. Examples for the employment of CNMs are the hierarchical assembly of 2D sheets for bio-recognition [31] and energy-funneling [27] applications as well as for implementation of organic-inorganic hybrids [32] . The distribution and orientation of active sites down to nanometer dimensions is of crucial importance for all applications and needs to be characterized in detail consequently.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and nanoscale characterization of hierarchically assembled molecular nanosheets

Richard‐Lacroix

Küllmer

Gaus

et al. 2021

Preprint

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Chemical functionalization of molecular two-dimensional (2D) materials towards the assembly of hierarchical functional nanostructures is of great importance for nanotechnology including areas like artificial photocatalytic systems, nanobiosensors or ultrafiltration. To achieve the desired functionality of 2D materials, these need to be characterized down to the nanoscale. However, obtaining the respective chemical information is challenging and generally requires the application of complementary experimental techniques. Here, we demonstrate the synthesis and chemical characterization of hierarchically assembled molecular nanosheets based on about 1 nm thin, molecular carbon nanomembrane (CNM) and covalently grafted, single-molecule layer cobalt(III) catalysts for the light-driven hydrogen evolution reaction (HER). We employ X-ray photoelectron spectroscopy (XPS) and tip-enhanced Raman spectroscopy (TERS) to access both the transversal and lateral chemical information of the synthesized nanosheets with nanometer resolution. TERS and XPS data provide detailed information on the average and local surface distribution of the catalyst as well as mechanistic details of the grafting reaction. The proposed approach represents a general route towards a nanoscale structural analysis for a variety of molecular 2D materials - a rapidly growing materials class with broad prospects for fundamental science and applications.

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Hybrid van der Waals heterostructures of zero-dimensional and two-dimensional materials

Cited by 26 publications

References 42 publications

Synthetic Two‐Dimensional Materials: A New Paradigm of Membranes for Ultimate Separation

Synthetic Two‐Dimensional Materials: A New Paradigm of Membranes for Ultimate Separation

Graphene Growth by Conversion of Aromatic Self‐Assembled Monolayers

Synthesis and nanoscale characterization of hierarchically assembled molecular nanosheets

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