题 目：Functional Nanocomposites – From Fabrication to Function

时 间：2018年9月19日 14:00

地 点：机械与动力工程学院F310会议室

邀请人：倪娜 副教授（叶轮机械研究所）

Biography

Franz Faupel received his Ph.D. in physics from the University of Göttingen in 1985. From 1987 to 1988, he was postdoctoral fellow at the IBM Th. J. Watson Research Center in Yorktown Heights and got his habilitation from the University of Göttingen in 1992. Since 1994, he is full professor and holds the Chair for Multicomponent Materials within the Faculty of Engineering at the Kiel University, where he is also faculty member in the Physics Department. Faupel is Chairman of the North German Initiative Nanotechnology and Principal Editor of the Journal of Materials Research. He is on the editorial boards of SN Applied Sciences and of Materials and has also been serving on the editorial boards of Applied Physics Letters, the Journal of Applied Physics, and other journals. He is member of Minerva-Weizmann Committee of the Max Planck Society, and from 2008 to 2010, he was Dean of the Faculty of Engineering. Faupel published more than 300 peer reviewed publications, which got ca. 10000 citations, and has an h factor of 50 (Google Scholar, 09/2018). His research interests include functional nanocomposites, magnetoelectric sensors, plasma deposition, metal-polymer interfaces, metallic glasses, and diffusion.

Abstract

Highly filled particulate nanocomposite films consisting of metal nanoparticles in a dielectric organic or ceramic matrix have unique functional properties with hosts of applications. In most applications, a high filling factor close to the percolation threshold with control of the particle separation on the nm scale is essential because the functional properties often require short-range interaction between nanoparticles. The present talk demonstrates how vapor phase deposition techniques can be employed for tailoring the nanostructure and the resulting properties. Vapor phase deposition, inter alia, allows excellent control of the metallic filling factor and its depth profile as well as the incorporation of alloy nanoparticles with well-defined composition. We applied various methods such as sputtering, evaporation, and plasma polymerization for the deposition of the matrix, and the metallic component was mostly sputter-deposited or evaporated. Recently, we put emphasis on generation of the nanoparticles by means of high-rate gas aggregation cluster sources to obtain independent control of filling factor and size of the embedded nanoparticles. Formation of plasmonic nanoparticles can be monitored in situ via UV-vis spectroscopy. We also demonstrate in situ control of the composition of alloy nanoparticles and the ability to fabricate multiple core-shell particles [1-3]. Examples of fabricated nanocomposites range from plasmonic meta-materials with tuned particle surface plasmon resonances through photoswitshable devices to memristors [4,5]. Moreover, we will show a new process for photocatalytic growth of Au nanostructures [6]. In addition to the particulate composites, a new concept of layered magnetoelectric composites will be presented for robust, fully integrable, broadband magnetic field sensors based on the delta E effect [7].

References

[1] O. Polonskyi, T. Peter, V. Zaporojtchenko, H. Biedermann, F, Faupel, Appl. Phys. Lett. 103 (2013) 033118.

[2] A. Vahl, J. Strobel, W. Reichstein, O. Polonskyi, T. Strunskus, L. Kienle, F. Faupel, Nanotechnology 28 (2017) 175703.

[3] P. Solař, O. Polonskyi, A. Olbricht, A. Hinz, A. Shelemin, O. Kylián, A. Choukourov, F. Faupel, H. Biederman, Sci. Rep. 7 (2017) 8514.

[4] M. Keshavarz Hedayati, M. Javaherirahim, B. Mozooni, R. Abdelaziz, A. Tavassolizadeh, V.S.K. Chakravadhanula, V. Zaporojtchenko, T. Strunskus, F. Faupel, M. Elbahri, Adv. Mater. 23 (2011) 5410.

[5] S.W. Basuki, V. Schneider, T. Strunkus, M. Elbahri, F. Faupel, ACS Appl. Mater. Interfaces 7 (2015) 11257.

[6] S. Veziroglu, M.Z. Ghori, M. Kamp, L. Kienle, H.-G. Rubahn, T. Strunskus, J. Fiutowski, J. Adam, F. Faupel, C. Aktas, Adv. Mater. Interfaces (2018) 1800465.

[7] B. Gojdka, R. Jahns, K. Meurisch, H. Greve, R. Adelung, E. Quandt, R. Knöchel, F. Faupel, Appl. Phys. Lett. 99 (2011) 223502; Nature 480 (2011) 155.