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Liquid Exfoliation of Icosahedral Quasicrystals

Yadav, Thakur Prasad and Woellner, Cristiano F and Sinha, Shyam K and Sharifi, Tiva and Apte, Amey and Mukhopadhyay, Nilay Krishna and Srivastava, Onkar Nath and Vajtai, Robert and Galvao, Douglas S and Tiwary, Chandra Sekhar and Ajayan, Pulickel M (2018) Liquid Exfoliation of Icosahedral Quasicrystals. In: ADVANCED FUNCTIONAL MATERIALS, 28 (26).

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Official URL: https://dx.doi.org/10.1002/adfm.201801181


The realization of quasicrystals has attracted a considerable attention due to their unusual structures and properties. The concept of quasicrystals in the atomically thin materials is even more appealing due to the in-plane covalent bonds and weak interlayer interactions. Here, it is demonstrated that 2D quasicrystals can be created/isolated from bulk phases because of long-range interlayer ordered aperiodic arrangements. An ultrasonication-assisted exfoliation of polygrained icosahedral Al-Pd-Mn quasicrystals at room temperature shows the formation of a large area of mono- and few layers in threefold quasicrystalline plane. The formation of these layers from random grain orientation consistently indicates that the threefold plane is most stable in comparison to the twofold and fivefold planes in icosahedral clusters. The above experimental observations are further supported with help of theoretical simulations. The mono- and few-layered aperiodic planes render plentiful active sites for the catalysis of hydrogen evolution reaction. The threefold 2D quasicrystalline plane exhibits a hydrogen evolution reaction overpotential of approximate to 100 mV (160 times less than bulk counterpart) and long-term durability. These systems constitute the first demonstration of quasicrystalline monolayer ordering in a free-standing thin layer without requiring the support of periodic or aperiodic substrate.

Item Type: Journal Article
Additional Information: Copyright of this article belong to WILEY-V C H VERLAG GMBH, POSTFACH 101161, 69451 WEINHEIM, GERMANY
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 16 Jul 2018 15:28
Last Modified: 16 Jul 2018 15:28
URI: http://eprints.iisc.ac.in/id/eprint/60176

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