TOPIC:Synthetic Carbon Nanostructures
SPEAKER:Dr. Reinhard Berger，Technical University Dresden, Center for Advancing Electronics Dresden (cfaed), 01062 Dresden, Germany
TIME：October 12 (Wednesday) PM14:00 
LOCATION:Room 518, Chemistry Building A (化学A楼518会议室)
INVITER:麦亦勇 特别研究员

Synthetic Carbon Nanostructures
Dr. Reinhard Berger
aTechnical University Dresden, Center for Advancing Electronics Dresden (cfaed),
01062 Dresden, Germany
Email: Reinhard.Berger@tu-dresden.de

Abstract:
  Modern Organic Chemistry offers many opportunities to fabricate tailor-made nanographenes and their extended derivatives such as graphene nanoribbons (GNRs).1,2 The very traditional fields of synthetic aromatic and heteroaromatic chemistry found renewed interest in such extended derivatives due to their implementation into materials science and their application into organic electronics and spintronics. In particular, we are interested in developing new synthetic methodologies for the construction of extended, edge-functionalized, anti-aromatic or so-called proaromatic polycyclic aromatic hydrocarbons (PAHs).3 We aim to tune the ground state of such PAHs to be open-shell thus containing unpaired electrons, which offers future application in spintronic devices. Replacing single or multiple carbon atoms of the sp2 framework of graphene molecules by heteroatoms such as nitrogen, boron, phosphorous or a combination of them, is an unique way to tune the optoelectronic properties of PAHs without changing their structural skeleton.4,5,6,7 Additionally, the stability and aromaticity of the resulting structures can be strongly influenced. Doped graphene molecules can provide new functions for electronics and energy-related fields.

References:
1 P. Ruffieux, S. Wang, B. Yang, C. Sánchez-Sánchez, J. Liu, T. Dienel, L. Talirz, P. Shinde, C. A. Pignedoli, D. Passerone, T. Dumslaff, X. Feng, K. Müllen and R. Fasel, Nature, 2016, 531, 489–492.
2 C. Sánchez-Sánchez, T. Dienel, O. Deniz, P. Ruffieux, R. Berger, X. Feng, K. Müllen and R. Fasel, ACS Nano, 2016, 10, 8006–8011.
3 R. Berger, A. Giannakopoulos, P. Ravat, M. Wagner, D. Beljonne, X. Feng and K. Müllen, Angew. Chemie Int. Ed., 2014, 53, 10520–10524.
4 R. Berger, M. Wagner, X. Feng and K. Müllen, Chem. Sci., 2015, 6, 436–441.
5 J. Cai, C. A. Pignedoli, L. Talirz, P. Ruffieux, H. Söde, L. Liang, V. Meunier, R. Berger, R. Li, X. Feng, K. Müllen and R. Fasel, Nat Nano, 2014, 9, 896–900.
6 X. Wang, F. Zhang, K. S. Schellhammer, P. Machata, F. Ortmann, G. Cuniberti, Y. Fu, J. Hunger, R. Tang, A. A. Popov, R. Berger, K. Müllen and X. Feng, J. Am. Chem. Soc., 2016, 138, 11606–11615.
7 J. Liu, S. Osella, J. Ma, R. Berger, D. Beljonne, D. Schollmeyer, X. Feng and K. Müllen, J. Am. Chem. Soc., 2016, 138, 8364–8367.

Biography:
  After undergradute studies at JGU (Mainz) and Cornell University (Ithaca), Reinhard Berger performed his graduate studies at the Max Planck Institute for Polymer Research in Mainz under the supervision of Prof. Klaus Müllen and obtained his PhD degree in February 2015. Afterwards, he joined the Chair for Molecular Functional Materials at the Center for Advancing Electronics Dresden as a group leader and is responsible for the organic synthesis of nanographenes and graphene nanoribbons. Since July 2016, he is also a group leader of a Young Researcher Group GRAPHD (graphene center Dresden) supported by the European Social Fund (ESF).