Molecular Routes to Two-Dimensional Metal Dichalcogenides MX2 (M = Mo, W; X = S, Se)

Autor:	Veronika Brune, Corinna Hegemann, Sanjay Mathur
Rok vydání:	2019
Předmět:	Thermal decomposition chemistry.chemical_element Chemical vapor deposition Tungsten Inorganic Chemistry Metal Crystallography Transition metal chemistry Octahedron Molybdenum visual_art visual_art.visual_art_medium Physical and Theoretical Chemistry Thin film
Zdroj:	Inorganic Chemistry. 58:9922-9934
ISSN:	1520-510X 0020-1669
DOI:	10.1021/acs.inorgchem.9b01084
Popis:	New synthetic access to two-dimensional transition metal dichalcogenides (TMDCs) is highly desired to exploit their extraordinary semiconducting and optoelectronic properties for practical applications. We introduce here an entirely novel class of molecular precursors, [MIV(XEtN(Me)EtX)2] (MIV = MoIV, WIV, X = S, Se), enabling chemical vapor deposition of TMDC thin films. Molybdenum and tungsten complexes of dianionic tridentate pincer-type ligands (HXEt)2NR (R = methyl, tert-butyl, phenyl) produced air-stable monomeric dichalcogenide complexes, [W(SEtN(Me)EtS)2] and [Mo(SEtN(Me)EtS)2], displaying W and Mo centers in an octahedral environment of 4 S and 2 N donor atoms. Owing to their remarkable volatility and clean thermal decomposition, both Mo and W complexes, when used in the chemical vapor deposition (CVD) process, produced crystalline MoS2 and WS2 thin films. X-ray diffraction analysis and atomic-scale imaging confirmed the phase purity and 2D structural characteristics of MoS2 and WS2 films. The new set of ligands presented in this work open ups convenient access to a scalable and precursor-based synthesis of 2D transition metal dichalcogenides.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e4061bd5343864d930531b055b876793 https://doi.org/10.1021/acs.inorgchem.9b01084 Zobrazit plný text záznamu