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Lomonosov Moscow State University Actual topics for collaboration on Physics and Chemistry of Advanced Materials.

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Presentation on theme: "Lomonosov Moscow State University Actual topics for collaboration on Physics and Chemistry of Advanced Materials."— Presentation transcript:

1 Lomonosov Moscow State University Actual topics for collaboration on Physics and Chemistry of Advanced Materials

2 Lomonosov Moscow State University Actual topics for PCAM collaboration Topics: Advanced carbon materials for modern applications Professor A. Obraztsov, Physics Department Materials for energy storage and conversion Professor E. Antipov, Chemistry Department Organic photovoltaics Professor D.Paraschuk, Physics Department New technology of HT-supercondactors production Professor A. Kaul, Chemistry Department Novel thermoelectric materials Professor A.Shevelkov, Chemistry Department Others topics could be considered as well!

3 Metal plate with holes substrate anode plasma cathode Carbon nanotube forest production by CVD Remote plasma allows usage non-conductive (dielectric) materials for substrate and reduce substrate temperature. [R.R. Ismagilov et al., Nano ACS, submitted] Lomonosov Moscow State University Actual topics for PCAM collaboration

4 Non-catalytical production of carbon nanotubes Traditional catalytical CNT growth Catalyst free growth of CNT [R.R. Ismagilov et al., Nano ACS, submitted] Lomonosov Moscow State University Actual topics for PCAM collaboration

5 Mesoporous Nano-Graphite Films A.N. Obraztsov et al., Diamond and Rel. Mat. 8(199)814 Carbon 46(2008)963 Lomonosov Moscow State University Actual topics for PCAM collaboration

6 AFM image of graphite film on Ni Graphite CVD films on Ni contain atomically flat regions and net of wrinkles. Typical height of the wrinkles is about 30 nm. Graphite films of nanometer thickness STM image of graphite film on Ni [A.N. Obraztsov et al., Carbon 45(2007)2017] Lomonosov Moscow State University Actual topics for PCAM collaboration

7 Field Effect Transistor of CVD Graphite Film FET device made with graphene flakes pilled out from CVD graphite film. 4 and 6 probe measurement at Room temperature SiO 2 – bottom gate (15) Al 2 O 3 – top gate (2) Source-drain contact (3,4,8,19): 5 nm Ti & 50 nm Au Lomonosov Moscow State University Actual topics for PCAM collaboration

8 New materials for Li batteries Li batteries – the most efficient energy storage devices Design and testing of new cathode materials based on mixed transition metal compounds with polyanions: fluorophosphates and borates Motivation: 1)higher ionicity of the M-F bond (as compared to the M-O one) and inductive effect of the (MO n ) m- polyanions with strong M-O bonds is expected to enhance the potential of the corresponding M n /M n+1 redox couple 2)twice larger amount of F is needed to achieve the same valence for transition metal larger free unit cell volume faster lithium migration Materials for batteries with higher energy and power densities Lomonosov Moscow State University Actual topics for PCAM collaboration

9 Li 2 CoPO 4 F: perspective high-voltage cathode material a c b a b c - Li1 - Li2 - Li3 2 migration pathways Capacity vs. voltage: from potentiostatic step measurements between 4.2 V and variable anodic potentials. Upper limit of electrolyte The slope of the capacity-voltage dependence 0.7 V per 1Li mole (like in LiCoO 2 ) + 3.5% volume expansion (0.6 Li removal) in contrast to 7% volume contraction in olivine Solid solution behavior High potential range Cathode material for high energy and power densities batteries 1) Patent: New Alkali Transition Metal Fluorophosphate International Publication Number WO 2010/ A2, 2010, 2) Structural transformation of Li 2 CoPO 4 F upon Li-deintercalation / JOURNAL OF POWER SOURCES 196 (2011) Lomonosov Moscow State University Actual topics for PCAM collaboration

10 Third generation organic and hybrid photovoltaics: thin, flexible, cheap, and efficient Electrodes Fullerene Flexible substrate Protective layer Polymer Light Polymer-fullerene bulk heterojunction solar cells 100 nm Active area 13 mm 2 Efficiency AM1.5 Active area ~1 cm 2 Efficiency AM1.5 Lomonosov Moscow State University Actual topics for PCAM collaboration

11 Novel nanomaterials for third generation photovoltaics Donor-acceptor charge-transfer complexes of conjugated polymers, highly photostable Exohedral metallocomplexes of fullerenes for higher photovoltage Low-bandgap polymers for higher photocurrent For dye-sensitized solar cells: low-temperature TiO 2 processing, Ru-free dyes, soft-solid electrolyte The goals: - towards 10% efficiency - to scale by wet roll-to-roll technology Lomonosov Moscow State University Actual topics for PCAM collaboration

12 Second generation (2G) HTSC coated conductor architecture 1. Biaxially textured metal tape obtained by cold rolling & annealing 2. Oxide buffer layer epitaxially grown on textured tape 3. Epitaxial superconducting layer of YBa 2 Cu 3 O 7-δ 4. Protecting layer of normal metals ( Ag + Cu) ~100 μ m ~ 1 μm The realized conception of the material is based on the texture transfer from metal tape (textured substrate) to superconducting layer via the buffer layer The technology is based on Metalorganic Chemical Vapor Deposition (MOCVD) of buffer and superconducting layers. - high deposition rate - high superconducting properties of HTSC layers - easy way to introduce nanosized inclusions for increasing superconducting current in high external magnetic field - low process price compared to high vacuum deposition technologies Lomonosov Moscow State University Actual topics for PCAM collaboration

13 Home made МОСVD equipment At home synthesized volatile precursors -Non-toxic -May be produced in industrial scale at moderate price Me(thd) 3 Lomonosov Moscow State University Actual topics for PCAM collaboration

14 Modern concept: Phonon Glass, Electron Crystal (PGEC) New Ideas for Better TE Materials Basic idea: Almost independent optimization of charge carrier transport and phonon transport due to the spatial separation of structural elements Phonon engineering ! New objects 1.Nanocage and nanoblock compounds 2.Nanocomposites 3.Superlattices and Nanostructures 1 2 A.V. Shevelkov, Russ. Chem. Rev. 2008, 77, 1–19 A.V. Shevelkov, et al. Chem. Mater. 2008, 20, 2476–2483 A.V. Shevelkov, et al. Inorg. Chem. 2009, 48, 3720–3730 Lomonosov Moscow State University Actual topics for PCAM collaboration

15 Prove of the concept: Extremely low thermal conductivity: lowest for narrow-gap semiconductors Recent Achievements in TE Engineering Nanocage inorganic clathrates Covalent framework: efficient transport of charge carriers Guest rattling: rejection of heat-carrying phonons High thermoelectric efficiency ZT = S 2 T / (dimensionless) Already promising properties: 1.ZT 0.6 at 650 K for automotive applications 2.ZT 0.4 at 1100 K coupled to utmost chemical and thermal stability for solar energy conversion 3.Almost 3-time growth of ZT at 300 K with nanocomposites formation are new routes to better ZT possible? A.V. Shevelkov, et al. Solid State Sci. 2007, 9, 664–671 A.V. Shevelkov, et al. Chem. Eur. J. 2008, 14, 5414–5422. A.V. Shevelkov, et al. Chem. Eur. J. 2010, 16, 12582–12589 Lomonosov Moscow State University Actual topics for PCAM collaboration

16 PCAM-MSU: Looking forward for fruitful collaboration!


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