Search for Higher Tc in Nanotubes and Spinning Superconducting Wires with CNT Yarns

Search for Higher Tc in Nanotubes and Spinning Superconducting wires with CNT Yarns

Anvar Zakhidov,
University of Texas at Dallas,

时间：9月30日下午4时，地点：教12-423

Our first task is a search for superconductivity with increased Tc>40 K in several types of nanotubes: carbon nanotubes, both multiwall MWCNTs, (made in UTD by CVD with low Fe catalyst content) and in single wall SWCNT, emphasizing separated pure semiconducting S-SWCNT and pure metallic M-SWCNT. One way to increase Tc is to tune charge carrier density in CNTs into singularity of density of states (DOS) upon three types of doping: Boron or substitutional doping, intercalation doping by alkali metals and electronic double layer charge (EDLC) injection. Another way to raise Tc is to increase electron-phonon coupling due to curvature effects, for which CNT with small diameter are synthesized and doped. The samples are characterized by SQUID, low-field microwave absorption LFMA combined with ESR and ex-situ by XRD, AFM, transport measurements, high-resolution TEM, etc.

Fundamental problem with achieving superconducting phase in quasi-one-dimensional systems, like CNTs, is the necessity of 3-dimensional coherence, for which we have developed several methods, including spark plasma sintering (SPS) of CNTs (by Clemson team) and formation of 3-D networks of interconnected MWCNT bundles by proper CVD conditions. In such interconnected MWCNT dense 3-D networks properly doped by boron by ion implantation the superconductivity is possible. The way to increase further Tc in SWCNTs by suppressing proximity effect in mixed SWCNT bundles will be discussed and examples of pure S-SWCNT doping will be demonstrated.

Our second task is to develop methods to create light-weight superconducting wires and cables by co-spinning non-superconducting MWCNT yarns with various superconducting components. We have demonstrated new method for making wires of nanocomposites of MgB2 with MWCNT yarns and YBCO with MWCNT sheets. This work is now extended to include FeSe deposition by PLD on MWCNTs in cooperation with TAMU team of Dr. H. Wang

ANVAR A.ZAKHIDOV

Professor of Physics and Associate Director and co-Founder of UTD NanoTech Institute

University of Texas at Dallas, MS BE26 Box 830688, Richardson, TX 75083-0688

972-883-6218 (5763) / 972-883-6529(fax); ;

214-435-2908 cell

Professional Preparation

B.S. Physics, TashkentTechnicalUniversity ,1973

M.S. Physical Electronics, TashkentTechnicalUniversity, 1975

Ph.D. Physics (Optics), Institute of Spectroscopy, USSRAcademy, Moscow, 1980

Appointments

August 2001- Present: Professor of Physics and Associate Director of NanoTech Institute, University of Texas at Dallas

1996-August 2001: Started as Principal Scientist and from 2000, Senior Research Scientist at Honeywell Intl, (former AlliedSignal)

1988-); Head of Thermal Physics Laboratory, Department of Thermo-Physics, UzbekAcademy of Sciences (1988-);

1992-95, Visiting Professor in Department of Electronics, OsakaUniversity,

1990-91, 94-95 Visiting Professor of Solid State Chemistry lab of the Institute of Molecular Science, Okazaki, Japan;

1992-93, Visiting Professor of the Consorzio INFM, Genova Institute of Molecular Spectroscopy, CNR, Bologna, Italy

Honors and Awards

APS Fellow, Nov. 2009; MRS Award for Top 5 Cool Paper/Best Talk, Spring 2007

Kapitza Medal for Scientific discovery (2007); Nano 50 Award from Nanotech Briefs Magazine (2006); NanoVic prise from Australia (2006); Asian-American Engineer of the Year Award, 2003

Japanese Society for Promotion of Science Fellowship, 1994; Italian Consorcia “Phyzika Materiali” Fellowship, Genova (1992-1993); Fellowship of Ministry of Science, Education and Culture, Japan (1990-1991, 1994)

Five Significant Publications:

1.Multiwalled carbon nanotube sheets as transparent electrodes in high brightness organic

light-emitting diodes, C. D. Williams, R. Ovalle Robles, M. Zhang, S. LiR. H. Baughman, and A.Zakhidov, Appl.

Phys. Lett. 93, 183506 2008

2. “Carbon Nanotubes – The Route Towards Applications”, R. H. Baughman, A. A. Zakhidov, and W. A. de Heer, Science297, 787-792 (2002).

3.“Strong, Transparent, Multifunctional, Carbon Nanotube Sheets , M. Zhang, S Fang, A. A. Zakhidov, S.B. Lee, A. Aliev, C. Williams, K. Atkinson, R. H. Baughman, Science,Vol. 309, 1215 (2005). 4. “Transparent carbon nanotube sheets as 3-D charge collectors in organic solar cells. R. Ulbricht, S.B. Lee, X. Jiang, K. Inoue, M. Zhang, S. Fang, R.H. Baughman, A. A. Zakhidov. Solar Energy Materials and Solar Cells, 91 (5): 416-419, 2007 5. Giant-Stroke, Superelastic Carbon Nanotube Aerogel Muscles ,A. E. Aliev, J. Oh, M. E. Kozlov, A. A. Kuznetsov, et al. A. A. Zakhidov ,Science, Vol.323. no. 5921, pp. 1575 – 1578

Synergistic Activities

(1) Serve as Managing Editor of the International Journal of Nanoscience (2002-), the Co- editor of special volume of Synthetic Metals (1993), and the editorial board of Molecular Materials (since 1990-)

(2) Since 1997, Co-PI of four programs that were each government (DARPA, NASA) or internationally (NEDO-Japan) funded at average level of $1-3 M. These programs were international in scope, and involved companies as well as universities.

(3) Serve on the International Advisory Board of the International Conferences on Synthetic Metals, ISCM (1988-) and International Topical Conference on Optical Probes of Conjugated Systems (1991-)

(4) Strong focus on developing new curriculum for courses on nanoscience, such as “Physics of Nanostructures,”, Photonics and Electronics of Nanosystems”, “Topics in Solid State”,

“Physics of Photonic Devices” for grad students

(5) Strong track record of serving on government panels, conference organization groups and journal articles reviewing.

Present graduate students at UTD (6): Kamil Mielczarek, Joseph Velten, Alex Cook, Austin Howard, Yi Yang, Julia Bykova

Present Research Associates and Post-doctorial fellows (6):

Drs. Rabia Moussa, Mike Kozlov, Ryotaro Ozaki; Alex Kuznetsov, Raquel Ovale, Alexios Papadimitratos

Publications and patents: over 240 articles (mentioned in Support materials) and 8USA patents ,

High Impact H factor 33