From Dongping: Special KAUST Seminar TODAY at 1:30pm in 1080PRB

[Zhong, Dongping]

Dear All:
I heard that the speakers prepared a few nice gifts to audience and get prepared. Come to see this rapidly-rising school with a fantastic landscape near the Red Sea.

Please take note of the Special Seminar TODAY at 1:30 PM in The Robert Smith Seminar Room. Details concerning the talk are as follows:

Speaker:         Osman M. Bakr, Kuo-Wei Huang and Omar F. Mohammed
Date:               Tuesday, March 8, 2016
Time:               1:30 PM
Place:              1080 Physics Research Building, The Robert Smith Seminar Room
Title:                New Materials and Imaging Methodologies Research in KAUST

Omar F. Mohammed: Selectively capturing the ultrafast dynamics of charge carriers on materials surfaces and at interfaces is crucial to the design of solar cells and optoelectronic devices. Despite extensive research efforts over the past few decades, information and understanding about surface-dynamical processes remains extremely limited. A key challenge is to selectively map such dynamic processes, a capability that is hitherto impractical by time-resolved laser techniques, which are limited by the laser’s relatively large penetration depth and consequently they record mainly bulk information. Such surface dynamics can now be mapped in real space and time by applying four-dimensional (4D) scanning ultrafast electron microscopy (S-UEM),[1,2] which records snapshots of materials surfaces with nanometer spatial and sub-picosecond temporal resolutions. In several unique applications, we spatially and temporally visualize the SE energy gain and loss, the charge carrier dynamics on the surface of InGaN nanowires and CdSe single crystals.

Osman M. Bakr: Low temperature solution-grown hybrid perovskite single crystals exhibit low trap density, a large non-linear optical absorption-cross-section, low intrinsic carrier concentration, high mobility, and long diffusion length for photogenerated charge carriers– outperforming perovskite-based polycrystalline disordered thin films and even putting them on par with optoelectronic grade III-V semiconductors.[3,4] These impressive characteristics make perovskites an ideal choice for realizing highly efficient photovoltaics, fast and sensitive photodetectors, as well as a wide array of linear and non-linear applications.
Kuo-Wei Huang: Pincer transition metal complexes have versatile reactivities to catalyze many organic transformations and to activate strong chemical bonds. In particular, complexes with ligand derived from tridentate pyridine-based framework exhibit interesting reactivities. It has been demonstrated that unique bond activation reactions can be achieved through aromatization–dearomatization of the central pyridine ring. We have designed and prepared a series of transition metal catalysts based on a novel class of pincer-type PN3 ligands which are capable of interacting with the substrates during the reaction. This “metal-ligand cooperative catalysis“ model offers unprecedented reactivities. Dehydrogenative coupling of alcohols and amines was achieved via protonation-deprotonation in the aromatization-dearomatization process.

References

1-     J. Sun, V. A.  Melnikov, J. I.  Khan, O. F. Mohammed, J. Phys. Chem. Lett., 2015, 6, 3884.

2-     J. I. Khan, A. Adhikari, J. Sun, D. Priante, R. Bose, B. S. Shaheen, T. K. Ng, C. Zhao, O. M. Bakr, B. S. Ooi, and O. F. Mohammed,Small, ASAP Article, 2016.

3-     M. I. Saidaminov, A. L. Abdelhady, M. Banavoth, E. Alarousu, V. M. Burlakov, W. Peng, I. Dursun, L. Wang, Y. He, G. Maculan1, A. Goriely, T. Wu, O. F. Mohammed and O. M. Bakr     Nature Communications, 2015, 6, 7586.

4-     D. Shi, V. Adinolfi, R. Comin, M. Yuan, E. Alarousu, A. Buin, Y. Chen, S. Hoogland, A. Rothenberger, K. Katsiev, Y. Losovyj, X. Zhang, P. A. Dowben, O. F. Mohammed, E. H. Sargent, O. M. Bakr, Science, 2015, 347, 519.

5-     H. Li, B. Zheng, K.-W. Huang, Coord. Chem. Rev., 2015, 116, 293.

Best regards,

Dongping Zhong
Robert Smith Professor of Physics
Professor of Chemistry and Biochemistry
The Ohio State University
Tel: 614-292-3044
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