Сколтех — новый технологический университет, созданный в 2011 году в Москве командой российских и зарубежных профессоров с мировым именем. Здесь преподают действующие ученые, студентам дана свобода в выборе дисциплин, обучение включает работу над собственным исследовательским проектом, стажировку в индустрии, предпринимательскую подготовку и постоянное нахождение в международной среде.

Архив метки: nano

Skoltech presented for the first time at the biggest international conference for the printed electronics industry

Skoltech professor Albert Nasibulin and Ph.D. student Evgenia Gilshteyn from Skoltech’s Laboratory of Nanomaterials took part at the LOPEC conference in Munich, which is the biggest international exhibition and conference for the printed electronics industry. In the event they presented novel results in wearable, printable and stretchable electronics with their poster talk.

Nasibulin and Gilshteyn presented their poster as part of the scientific conference, which is the forum where scientists can discuss the latest concepts and results of their research. We asked Gilshteyn to tell about the presentation and the event. “The topic of our poster was “stretchable electronic devices based on carbon nanotubes”, and the discussion around our poster was quit massive. On the other hand – this conference was a great opportunity to find some new collaborations – with Germany, Israel, Belgium and others, in order to make some joint researches. In addition, it was very interesting to visit the technical conference, which was geared towards industry and applications, as well as promoting the ongoing development of products and business sectors”.

With roughly 200 presentations from about 30 different countries, the LOPEC conference is the world’s leading communication platform for research, knowledge, and solutions in the emerging field of printed electronics industry. This year the conference focused specifically on the challenges that arise when technologies are transformed into marketable applications. The discussions focused on the following sectors: wearables trend, automotive industry and consumer electronics.

Nasibulin and Gilshteyn were the only representative from Russia in the whole event. We hope to see greater Skoltech and Russian presence in future conferences related to this blooming technological area.

Solid State Seminar: Interplay Between Intrinsic and Contact Phenomena in Carbon Nanotube Devices

Carbon Nanotubes. Image courtesy of Pacific Northwest National Laboratory - PNNL, Flickr

Carbon Nanotubes. Image courtesy of Pacific Northwest National Laboratory – PNNL, Flickr

We would like to invite you to the next Solid State Physics seminar.

When: 4  March, Wednesday at 16:00

Where: Beijing-1 auditorium, Moscow School of Management

Speaker: Dr. Georgy Fedorov, Kurchatov Institute.

Title: “Interplay between intrinsic and contact phenomena in carbon nanotube devices”.

 

 

 

Abstract:

The properties of nanoelectronic semiconductor devices are greatly affected by contact phenomena. Complete description of the phenomena taking place at the semiconductor-metal interface requires sophisticated calculations, especially in case of structures with reduced dimensionality. Carbon nanotubes (CNTs) present a perfect model object to study the rich physics of nanoscale semiconductor devices.

One of the unique features of CNTs is the ability to tune its band structure in a controllable way with magnetic field. In the first part of my talk I will show how using this effect we made a simple and efficient model for simulating transport characteristics of CNT devices accounting for the contact phenomena at the CNT/metal interface. Next we use this to analyze the chemical sensitivity of CNT-based FET devices. Importantly in both cases the response of the device to the change in the external conditions is defined by both the changes in the intrinsic properties of the conduction channel and the properties of the CNT-electrode interface.

Finally I will show how band engineering via the contact configuration allowed for observation of a strong photo thermo-electric response in asymmetric carbon nanotube devices exposed to sub-terahertz radiation. Using the developed model of transport properties of the CNT devices the thermoelectric power (TEP) of a ballistic 1D conductor is calculated as a function of the gate voltage accounting for the Schottky barriers at the CNT/metal interface. The simulations results are compared to the response of our devices in order to highlight the thermal origin of some of its features.

Если у Вас возникли вопросы и/или Вы хотели бы зарегистрироваться на событие, пожалуйста, Лилии Абаимовой. Рабочий язык мероприятия – английский, вход свободный. Приходите, мы будем рады видеть Вас!

The Perfect Defect: Researcher Unveils Nanowire Growth Mystery

Growing nanowires is a delicate and complex process. Now a Skoltech researcher teamed up with international scientists to reveal a new way to monitor and guide growth by using the material's defects. Image courtesy of nist.gov

Growing nanowires is a delicate and complex process. Now a Skoltech researcher teamed up with international scientists to reveal a new way to monitor and guide growth by using the material’s defects. Image courtesy of nist.gov

Nano-wires have fascinated and intrigued researchers for decades. These extremely thin and elongated structures (10−9 meter) are considered to be promising materials for high efficiency electronic devices. They are particularly useful in chemical and biological sensors, solar cells, field emission devices, and lasers. But crucial parts of the process that guide their growth remained a mystery. Now Professor Albert Nasibulin, a researcher at Skoltech, teamed up with colleagues from Denmark and Finland to reveal new facts about the behavior of nano-wires during metal oxidation: the process occurs without catalysts and is guided by planar defects. Simply put, faults serve as both guides and engines for growth. The researchers published their findings in the scientific journal Nano Letters. These could help future efforts to control the properties of nano-wires.

High yield nano-wires have applications in batteries and transparent conductive electrodes. Their use as tribological (interacting surfaces) additives is also high on many scientists priority list. Despite a wide scientific interest, nano-wires synthesis is usually limited to just a few methods in which a catalyst, namely gold nano-particles, plays the main role. In contrast, non-catalytic methods produce purer nano-materials and could minimize the number of technological steps required for their production.

However, the process underlying nano-wire growth without a catalyst remained unknown. Moreover, it was widely disputed if any nano-scale wire growth is possible without using nanometer sized particles as guides.

Scanning electron microscopy images of various nanowires synthesized by heating metal at ambient conditions. Source Nanotechnology 20, 165603 (2009).

Scanning electron microscopy images of various nanowires synthesized by heating metal at ambient conditions. Source Nanotechnology 20, 165603 (2009).

In the past, researchers from Aalto University (Finland) proposed a novel method to grow metal oxide nano-wires without a catalyst, by simply oxidizing pure metals in air (Figure 1). However, the mechanism guiding their formation was not fully understood. Latest advances in electron microscopy allow for closer examination of chemical reactions without disrupting them.

Yet recently Prof. Albert Nasibulin of Skoltech (Skolkovo Institute of Science and Technology), Dr. Simas Rackauskas of Aalto University (Finland), and researchers from Kemerovo State University and the Technical University of Denmark have achieved a breakthrough: they examined in situ nano-wire growth.

The researchers synthesized CuO (Copper Oxide) nano-wires by oxidizing samples of pure copper inside a transmission electron microscope. Then they have been able to observe and follow the complete process of nano-wire formation. The atomic level investigation shows how layers of Copper Oxide are organized at the tip of growing nano-wire. They nucleate only at the specific position on the surface, which is associated with planar crystal defects known as twin boundaries.

Thus, the study unambiguously showed that nano-wire growth might occur without catalyst particles. Moreover, these observations reveal that all nanowires contain defects, which are crucial to guide the materials’ growth.

The nanowire growth starts from the atomic layer nucleation at the crystal defect (twin boundary) and continues forming a long range ordering along the defect. The figures show TEM images revealing the twin boundary defects in the nanowire crystal and the mechanism of its layer-by-layer growth (Source: Nano Letters. Article ASAP DOI: 10.1021/nl502687s).

The nanowire growth starts from the atomic layer nucleation at the crystal defect (twin boundary) and continues forming a long range ordering along the defect. The figures show TEM images revealing the twin boundary defects in the nanowire crystal and the mechanism of its layer-by-layer growth (Source: Nano Letters. Article ASAP DOI: 10.1021/nl502687s).

In the future, one can expect this work to be the starting point of a new approach. Defects could be used for nano-wire growth control. Consequently, they can even help shape the materials’ geometry, in a similar way to the catalyst assisted method (Figure 2).

“Catalyst-free methods are attractive for facile fabrication of pure nano-wires without the need for catalyst preparation and subsequent purification of the produced material”, suggests Prof. Albert Nasibulin of Skoltech. “Now, when the mechanism guiding the nano-materials growth without catalysts is understood, the next step is controlled synthesis of pure nano-wires with specific properties for their mass application”.

The results have been recently published in the scientific journal Nano Letters.

Rackauskas, H. Jiang, J. B. Wagner, S. D. Shandakov, T. W. Hansen, E. I. Kauppinen, and A. G. Nasibulin. In Situ Study of Noncatalytic Metal Oxide Nanowire Growth. Nano Letters. Article ASAP DOI: 10.1021/nl502687s. (http://dx.doi.org/10.1021/nl502687s)

 

* The Skolkovo Institute of Science and Technology (Skoltech) is a private graduate research university in Skolkovo, Russia, a suburb of Moscow. Established in 2011 in collaboration with MIT, Skoltech educates global leaders in innovation, advance scientific knowledge, and foster new technologies to address critical issues facing Russia and the world. Applying international research and educational models, the university integrates the best Russian scientific traditions with twenty-first century entrepreneurship and innovation.

 

Если у Вас возникли вопросы и/или Вы хотели бы зарегистрироваться на событие, пожалуйста, Лилии Абаимовой. Рабочий язык мероприятия – английский, вход свободный. Приходите, мы будем рады видеть Вас!

Seminar May 28: Composite Materials from Nano to Macro

Every discussion about composite materials seems to mention their unusual strength, resilience or elasticity. They are used to coat shoes, make jets stronger and cars safer and are recognized in a wide range of industries – from civil engineering, oil and gas to aerospace. But what’s next? Our guest speaker Prof. Gilles Lubineau believes he can see the path ahead.

In his seminar he will focus on the need to further develop multi-functionality and multi-physics approaches to composite materials.  Study cases will be presented to illustrate, in very practical situations, the need for better composite based engineering from the material design to the field operations.

May 28, 2014 13.30 – 15.00 Sao-Paolo Auditorium, Brazil cluster Skolkovo School of Management

Seminar Title: «MULTI-FUNCTIONALITY AND MULTI-PHYSICS FOR COMPOSITES ENGINEERING: SOME APPLICATIONS FROM NANO TO MACRO»

Composites offer tremendous durability and strength, and allow the design of complex geometric forms and the engineering of bespoke materials. Image courtesy Nick Cross / Gurit, Flickr.

Composites offer tremendous durability and strength, and allow the design of complex geometric forms and the engineering of bespoke materials. Image courtesy Nick Cross / Gurit, Flickr.

ABSTRACT:

Composite materials are now recognized in a wide range of industries as viable candidates when excellent mechanical properties are required. Yet, increasing the reliance on composite parts in the design and meeting future challenges for cost efficiency and reduced environmental impact will require better mastery of the way we design with these materials.

Some key challenges have to be solved to improve composite based design. Multi-functionality is important to ensure integration. Aging, especially under multi-physics loading starts to be critical in any industry, from civil engineering, oil and gas industry to aerospace. Advanced structural health monitoring is also needed to push the design limits so that the designer has continuous feedback about how the structure evolves with time.

This talk will give a general overview of my research activities in these different areas, and will highlight the need for having a highly multidisciplinary and across-the-board team to tackle such complex issues. Among the topics presented are:

• Multifunctional composite materials. Development and optimization of hierarchical composites for tailored mechanical/electrical/thermal properties.

• Integrity/Durability of composite materials and structures.

• Inverse problems for identification of constitutive parameters and/or monitoring.

• Multi-scale coupling techniques for objective prediction of failure.

Study cases will be presented to illustrate, in very practical situations, the needs for better composite based engineering from the material design to the field operations.

Professor Gilles Lubineau, the Skoltech seminar guest speaker May 28

Professor Gilles Lubineau, the Skoltech seminar guest speaker May 28

SPEAKER INTRODUCTION:

Prof. Gilles Lubineau is the principal investigator for COHMAS (COmposite and Heterogeneous Materials Analysis and Simulation), an integrated environment for composite engineering that he created in 2009 when joining KAUST as an Associate Professor.

Current research interests include: short and/or long-term integrity of composite materials and structures, inverse problems for the identification of constitutive parameters, multi-scale coupling technique, multifunctional materials and modeling.

Before joining KAUST, Prof. Lubineau was a faculty member at the École Normale Supérieure of Cachan, and a non-resident faculty member at the École Polytechnique, France. He also served as a visiting researcher at UC-Berkeley. Prof. Lubineau earned a PhD degree in Mechanical Engineering from École Normale Supérieure de Cachan (ENS-Cachan), France. In 2004, he received the Daniel Valentin Award for best innovative works related to the field of composite materials. Prof. Lubineau was ranked 1st at the agrégation in theoretical mechanics and was granted his research habilitation in Mechanics in 2008. He is a member of various Editorial boards (including the International Journal of Damage Mechanics).

Если у Вас возникли вопросы и/или Вы хотели бы зарегистрироваться на событие, пожалуйста, Лилии Абаимовой. Рабочий язык мероприятия – английский, вход свободный. Приходите, мы будем рады видеть Вас!

masterpas_01_icom_small.png
Оплата на сайте

Оплата на сайте

2011-2024 © Сколтех
Сколковский институт науки и технологийСведения об образовательной организации
?>