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Ab initio investigation of physicochemical properties of nanoflakes of PtS2 due to the size

Grant number: 18/14574-2
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2018
Effective date (End): August 31, 2019
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Juarez Lopes Ferreira da Silva
Grantee:Leonardo Santiles Dalacqua
Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated research grant:17/11631-2 - Computational material science and chemistry, AP.PCPE

Abstract

Two-dimensional (2D) materials have attracted great attention in the literature, especially materials based on dichalcogenides of transition metals (DMTs), composed by the chemical equation MQ2 where M is the transition metal and Q = S, Se, Te. These materials have electronic, optical and mechanical properties that to become candidates for a large number of applications. 2D DMTs may present more than one type of geometry in the vicinity of the metal atoms (polytype) and the properties of these materials vary according to the number of layers, which makes the study of 2D DMTs in monolayers arise as a large area of study. Obtaining finite 2D DMTs (nanoflakes) becomes an important area of study as well, since edge configurations determine energy stability and catalytic properties of the nanoflake. The method of obtaining 2D DMTs currently used is chemical vapor deposition (CVD) and the mechanism of formation of these materials through CVD is accepted as being self-seeding dependent. However, there are no studies in the literature that correlate the interatomic interactions of stoichiometric nanometric clusters of 2D DMTs and their energy preferences as well as the mapping of how energy, electronic and structural properties evolve according to the size of the cluster. In the present project we intend by combining the theory of the functional density (DFT) and comparison by modified Euclidean metrics to obtain knowledge at the atomistic level of how physicochemical properties evolve and which are the most energetically favored isomers of (PtS2)n, seeking the understanding of how the interatomic interactions present in these clusters determine the evolution of properties and energy preference by the dimensionalities assumed by the lower energy clusters, thus producing results of high value and scientific novelty.