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Chemical vapor growth and delamination of α-RuCl3 nanosheets down to the monolayer limit

Abstract

The 2D layered honeycomb magnet α-Ruthenium(III) chloride (α-RuCl3) is a promising candidate to realize a Kitaev spin model. As alteration of physical properties on the nanoscale additionally is intended, new synthesis approaches to obtain phase pure α-RuCl3 nanocrystals have been audited. Thermodynamic simulations of occurring gas phase equilibria has been performed and optimization of synthesis conditions was achieved based on calculation results. Crystal growth succeeded via chemical vapor transport (CVT) in a temperature gradient 973 K to 773 K on YSZ substrates. Single crystal sheets of high crystallinity with heights ≤ 30 nm have been obtained via pure CVT. The crystal properties are characterized by means of optical and electron microscopy, AFM, SAED, micro-RAMAN and XPS proving composition, morphology, crystallinity and phase-purity. A highlight of our study is the successfull individualization of nanocrystals and delamination of nanosheets on YSZ substrates down to the monolayer limit (≤ 1 nm) which has been realized by means of substrate exfoliation and ultrasonication in a very reproducible way.

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Publication details

The article was received on 08 Jun 2018, accepted on 29 Aug 2018 and first published on 03 Sep 2018


Article type: Paper
DOI: 10.1039/C8NR04667K
Citation: Nanoscale, 2018, Accepted Manuscript
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    Chemical vapor growth and delamination of α-RuCl3 nanosheets down to the monolayer limit

    M. Grönke, P. Schmidt, M. Valldor, S. Oswald, D. Wolf, A. Lubk, B. Büchner and S. Hampel, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR04667K

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