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Expanding the World of Two-Dimensional Materials

SpeakerYury Gogotsi

Date: Saturday, 16th July 2016

Time: 10:00 AM

Venue: Central Conference Room, Library

Yury Gogotsi is Distinguished University Professor and Trustee Chair of Materials Science and Engineering at Drexel University. He is the founding Director of the A.J. Drexel Nanomaterials Institute and Associate Editor of ACS Nano. He works on nanostructured carbons and two-dimensional carbides for energy related and biomedical applications. He has co-authored 2 books, published more than 400 journal papers and obtained more than 50 patents. He has received numerous national and international awards for his research, with the latest one being the 2015 Nanotechnology International Prize from RUSNANO.  He was recognized as a Highly Cited Researcher by Thomson-Reuters in 2014 and 2015, and elected as a Fellow of AAAS, MRS, ECS, RSC, ACerS and the World Academy of Ceramics.

Abstract:

Two-dimensional (2D) solids – the thinnest materials available to us – offer unique properties and a potential path to device miniaturization. The most famous example is graphene, which is an atomically thin layer of carbon atoms bonded together in-plane with sp2 bonds.

  In 2011, an entirely new family of 2D solids – transition metal carbides (Ti2C,  Nb4C3, etc.) and nitrides – was discovered by Drexel University [1] . Selective etching of the A-group element from a MAX phase results in formation of 2D Mn+1Xn solids, labeled “MXene”. About 20 different carbides, nitrides and carbonitrides have been reported to date [2-5] .

  A new sub-family of multi-element ordered MXenes was discovered recently [2]. MXenes can be metallic or semiconducting, depending on their surface termination. Oxygen or OH terminated MXenes, are hydrophilic, but electrically conductive. Hydrazine, urea and other polar organic molecules can intercalate MXenes leading to an increase of their c lattice parameter [3]. When dimethyl sulfoxide or TBAOH was intercalated into Ti3C2, followed by sonication in water, a stable colloidal solution of single- and few-layer flakes was produced. One of the many potential applications for 2D Ti3C2 is in electrical energy storage devices such as batteries, Li-ion capacitors and supercapacitors [3-5]. Cations ranging from Na+ to Mg2+ and Al3+ intercalate MXenes. Ti3C2 paper electrodes, produced by vacuum assisted filtration of an aqueous dispersion of delaminated Ti3C2, show a higher Li-ion capacity than graphite anodes and also can be charged/discharged at significantly higher rates. They also demonstrate very high intercalation capacitance (above 1000 F/cm3) in aqueous electrolytes [4].

 

References

[1] M. Naguib, et al, Advanced Materials, 23 (37), 4207-4331 (2011)

[2] B. Anasori, et al, ACS Nano, 9 (10) 9507–9516 (2015)

[3] O. Mashtalir, et al, Nature Communication, 4, 1716 (2013)

[4] M M. Ghidiu, Nature, 516, 78–81 (2014)

[5] M. Naguib, Y. Gogotsi, Accounts of Chemical Research, 48 (1), 128-135 (2015)

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