Dimensionality Concept in Solid‐State Reactions: A Way to Control Synthesis of Functional Materials at the Nanoscale. (2nd August 2020)

• Record Type: Journal Article
• Authors: Tokmachev, Andrey M.; Averyanov, Dmitry V.; Karateev, Igor A.; Sokolov, Ivan S.; Parfenov, Oleg E.; Storchak, Vyacheslav G.
• Is Part Of: Advanced functional materials. Volume 30:Number 39(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-02
• Subjects: confinement -- dimensionality -- layered materials -- synthesis -- ternary compounds; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202002691
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: The concept of dimensionality is fundamental in physics, chemistry, materials science, etc. Low‐dimensional and layered materials are distinguished by their unique physical properties and applications. Concurrently, low‐dimensional reactants, products, and reaction spaces extend the toolbox of materials science considerably. Here, the concept of dimensionality is adapted to solid‐state reactions by counting the basic axes along which the unit cell undergoes significant expansion/shrinking. For illustration, 1D synthesis of layered ternary compounds MA2 X2 via derivatives of 2D‐Xenes, silicene, and germanene, is demonstrated, and the reaction mechanism and the role of templates are determined. The approach is then extended to 1D synthesis of non‐layered compounds. The 1D nature of the reactions, established with structural studies, is explored by nanoscale confinement. The mutual orientation of the reaction and confinement—parallel (thus preventing the lattice expansion) or orthogonal—controls the reaction pathways and outcome. The work provides a proof‐of‐concept for anisotropic reactivity caused by directional confinement. Abstract : The concept of dimensionality is adapted to solid‐state reactions. 1D synthetic routes to ternary layered materials are introduced employing intercalated multilayer silicene and germanene compounds as intermediates; the reaction mechanism, the role of templates, and potential extension to non‐layered materials are explored. Directional nanoscale confinement controls the outcome of low‐dimensional reactions.