Fibrillation of Pristine 2D Materials by 2D‐Confined Electrolytes

Author:

Tan Hui Li1,Donato Katarzyna Z.1,Costa Mariana C. F.123,Carvalho Alexandra13,Trushin Maxim123ORCID,Ng Pei Rou13ORCID,Yau Xin Hui1,Koon Gavin K. W.1,Tolasz Jakub4ORCID,Němečková Zuzana4,Ecorchard Petra4ORCID,Donato Ricardo K.1ORCID,Neto Antonio H. Castro123ORCID

Affiliation:

1. Centre for Advanced 2D Materials National University of Singapore Singapore 117546 Singapore

2. Department of Materials Science and Engineering National University of Singapore Singapore 117575 Singapore

3. Institute for Functional Intelligent Materials (I‐FIM) National University of Singapore Singapore 117544 Singapore

4. Institute of Inorganic Chemistry of the Czech Academy of Sciences Husinec‐Řež 1001 Řež 250 68 Czech Republic

Abstract

Abstract2D materials are solid microscopic flakes with a‐few‐Angstrom thickness possessing some of the largest surface‐to‐volume ratios known. Altering their conformation state from a flat flake to a scroll or fiber offers a synergistic association of properties arising from 2D and 1D nanomaterials. However, a combination of the long‐range electrostatic and short‐range solvation forces produces an interlayer repulsion that has to be overcome, making scrolling 2D materials without disrupting the pristine structure a challenging task. Herein, a facile method is presented to alter the 2D materials’ inter‐layer interactions by confining organic salts onto their basal area, forming 2D‐confined electrolytes. The confined electrolytes produce local charge inhomogeneities, which can conjugate across the interlayer gap, binding the two surfaces. This allows the 2D‐confined electrolytes to behave as polyelectrolytes within a higher dimensional order (2D → 1D) and form robust nanofibers with distinct electronic properties. The method is not material‐specific and the resulting fibers are tightly bound even though the crystal structure of the basal plane remains unaltered.

Funder

National Research Foundation

Ministerstvo Školství, Mládeže a Tělovýchovy

Grantová Agentura České Republiky

Ministry of Education - Singapore

Publisher

Wiley

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