Most important
Passport project

Project name

N

Project managers

Nanostructure Fundamental Material Science

Dr. Phys.-Math.Sci., Pavel B.Sorokin

Project target

The tasks of the project are:

-       Deeper scientific knowledge of non-carbon nanomaterials, mostly two-dimensional

-       Search for  new stable nanostructures, study of their stability conditions, electronic and magnetic properties

-       Study of stable nanostructure based  hetero structures 

Project objectives

The aim of the project is creating an infrastructure for independent fundamental studies of nanomaterials, as well as providing theoretical support of experiments held in NUST MISiS and other research teams abroad.

Uniqueness project

The uniqueness of the project lies in direct collaboration of international and Russia experimental research teams. Nanostructures fundamental research outcomes received by Russia-based research team are integrated into experiments of international laboratories all over the world. Such collaboration is optimized and provides for world-level research.

The project timeliness is determined by deeper scientific knowledge various two-dimensional nanomaterials, search for new nanostructures, their stability and properties study as well as nanostructure-based hetero structures studies. The new field of two-dimensional materials, based on graphene discovery, has big opportunities for fundamental research and practical applications.  Presently the focus is on two-dimensional films of various chemical compositions with wise range of properties. Such activity impacts the number of publications on the issue – a great number of articles are devoted to non-carbon two-dimensional films, studied by leading research teams all over the world. 

Fundamental scientific issue, the project focuses on, is deepening scientific knowledge of non-carbon nanomaterials, mostly two-dimensional, search for new stable nanostructures, study of their stability conditions, electronic and magnetic properties as well as study of stable nanostructure-based hetero structures.

This issue was raised due to huge interest to new two-dimensional structures in the post-graphene era. It is, first of all, caused by difficulties in using graphene in semi-conductor electronics, which prompted researches to look at non-carbon two-dimensional materials. In spite of all efforts to find two-dimensional structures with perspective conducting properties, the present state of research does not provide for such materials which would meet all requirements of modern science and technology.

Indeed, most widely studied representatives of dichalcogenides family of MoS2 and WS2 transition metals demonstrate insufficient mobility of charge carriers, which diminishes opportunities of their application in semi-conducting devices.

Further search for semi-conducting two-dimensional material with high mobility of charge carriers has not succeeded so far. Two-dimensional films composition search is not limited to semi-conducting structures. Dimension reduction often leads to new physical effects which are interesting and unexpected from fundamental point of view and in terms of further application. For example, graphitization of ion films into weakly bound layers of hexagonal symmetry can be reversed by destabilizing dipole moment. Another example: MoS2 electronic properties change with its dimension change. Double-layer MoS2 has properties of indirect semiconductor with forbidden band value of 1.6 eV, while mono-layer MoS2 is a direct semiconductor with a bigger forbidden band value of 1.9 eV, which demonstrates distinct photoluminescent properties absent in 3D model. The effect of transition type change from indirect to direct when reaching the film thickness of one layer, can be observed also in WS2 and other dichalcogenide transition metals such as MoSe2, WSe2 and MoTe2.

The most promising seems obtaining two-dimensional materials-based hetero structure by placing 2D structure one on top of the other. Thus hetero structure consisting of graphene, boron nitride and dichalcogenide transition metals, can radiate light from the whole surface when passing electric current, which means it is a super thin and super flexible light-emitting diode.

 

It is important to underline that the hetero structure properties completely depend on the type and order of two-dimensional layers. Huge number of combinations of layers in such 2D hetero structures call for primary theoretical analysis which would help to perform complicated experimental synthesis of such materials with clear understanding of the target structure. Hetero structures as well as certain 2D films can serve as a base for next generation electronic devices, spintronics, photovoltaics, etc.

Equipment

There is access to a high performance computing cluster at NUST MISiS which enables to make theoretical projections of high level. Collaboration with international research teams gives access to our colleagues’ resources.

Partnership and cooperation

The main aim of the project is collaboration in research with experimental groups, which means wide range of contacts with various international and international research teams. Our partners in the project are experimental and theoretical teams from Japan (JAEA), South Korea (Kyungpook National University), Finland (Aalto University), Germany (Helmholtz-Zentrum Dresden-Rossendorf), USA (Tulane University), the Netherlands (University of Twente), etc. The infrastructure members are constantly expanding their exposure participating in workshops as invited speakers.

Our projects
Last comments



Яндекс.Метрика