Funded by the CSC, this program offers scholarships to up to 30 students per year for doctoral studies in one of Sorbonne Universités member institutions. It also supports joint PhD (cotutelles).
The duration of scholarships is:
•48 months maximum for students doing a full PhD in one of Sorbonne Universités member institutions ;
•12 to 24 months for students performing a joint PhD (cotutelle) or a PhD under joint French-Chinese supervision between a Sorbonne Universités member institution and a Chinese university.
The selected students will be awarded a �1200/month scholarship (including health insurance) during their stay in France. CSC also covers travel and visa expenses.
Janus tectons combining orthogonal self-assemblies at and over the substrate:
towards tunable emitters
The research is focused on two-dimensional (2D) supramolecular self-assembly at surfaces, with the ultimate goal being to excite the single-molecule luminescence. The key issue is to find a strategy to avoid the problem of electronic coupling of semiconducting organic molecules to a metallic surface. Achieving nanometer-scale control over the organization of molecules on well-defined surfaces is a very active field of nanotechnology. Bottom-up approaches exploiting the self-assembly of molecular building blocks have been widely employed to generate either out-of-plane or in-plane organizations. The next challenge will be the realization of functional molecular assemblies which involve complex 3D molecular architectures, combining simultaneously out-of-plane and in-plane organization.
In this context we proposed for the first time, a novel, highly versatile concept, the Janus-like 3D tecton concept: a dual-functionalized molecular building block consisting of two different faces (A and B) linked by a rigid spacer, where A is designed for acting as a pedestal capable to steer 2D self-assembly on the substrate, while B is a functional entity (1, 2). In the previous strategy, the whole molecule was synthesized before adsorption on the substrate and the functional entity was a chromophore (light emitting molecules). Thus the potential optical properties were pre-determined. Here we proposed to use a guest-host concept to reach a tunable emission. This will be achieved by using supramolecular chemistries (not the sames as for the self-assembly on the substrate) to bind the chromophore leading to an orthogonal self-assembly approach. We aim to synthesize a building block X able to self-assemble on the substrate leading to a platform acting as a host matrix able to catch, since self-assembled, emitting guest Y of tunable lengths then of tunable wavelengths. Thus, we expect to obtain a versatile emitting platform.
In the framework of the thesis the candidate will first (i) synthesize the guest and host molecules and (ii) characterize them in solution by photophysics and electrochemistry to determine experimentally the optical (absorption/emission) and electronic properties. The binding constants of guest-host molecules will be also determined. In a second stage, the self-assembly properties of the guest molecules and the binding of the host species will be investigated by scanning tunneling microscopy (STM) at substrate/liquid interface. This work will be done in cooperation with a laboratory of the National Center for Nanoscience and Technology, Beijing. Finally the possibility to excite the luminescence locally by a tunnel current will be also probed by STM at CEA (France). The candidate will have experience in organic chemistry and/or physical chemistry. Applicants should hold a MSc degree (or equivalent) in chemistry. Motivation to work in a multidisciplinary environment is fundamental to this position. the PhD applicant will benefit from all the high level facilities of the Paris Institute of Molecular chemistry (UPMC-Sorbonne Universities), and from the great experience of the host team in the chinese student welcoming (CSC program).
The candidate will have experience in organic chemistry and/or physical chemistry. Applicants should hold a MSc degree (or equivalent) in chemistry. Motivation to work in a multidisciplinary environment is fundamental to this position. the PhD applicant will benefit from all the high level facilities of the Paris Institute of Molecular chemistry (UPMC-Sorbonne Universités), and from the great experience of the host team in the Chinese student welcoming (CSC program).
Two major publications in the domain of the thesis proposal:
1) Surface-Confined Self-Assembled Janus Tectons: A Versatile Platform towards the Noncovalent Functionalization of Graphene. AngewandteChemie International Edition, Volume 53, 2014, 10060–10066, P. Du, M. Jaouen, A. Bocheux, C. Bourgogne, Z. Han, V. Bouchiat, D. Kreher, F. Mathevet, C. Fiorini-Debuisschert, F. Charra and A.-J. Attias
2) Janus-Like 3D Tectons: Self-Assembled 2D Arrays of Functional Units at a Defined Distance from the Substrate. AngewandteChemie International EditionVolume 50, 2011, 6562–6566, D. Bléger, F. Mathevet, D. Kreher, A.-J.Attias, A. Bocheux, S. Latil, L. Douillard, C. Fiorini-Debuisschert and F. Charra