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法国洛林大学LCMPE实验室Alain Walcarius 教授招收博士研究生
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Laboratoire de Chimie Physique et Microbiologie pour l'Environnement (LCPME)是法国国家科学研究中心（CNRS）与洛林大学（Université de Lorraine）共建的实验室，位于法国东部城市南锡。 Alain Walcarius 是法国国家科学研究中心高级研究员，2016 年入选国际电化学会会士，并在电化学领域荣获多个奖项，包括：国际电化学会 Tajima 奖、法国化学会电分析化学奖、分析化学奖 、物理化学杰出奖，以及法国“朗之万”科学奖等。目前在 Chem. Soc. Rev.、Nature Materials、Angew. Chem. Int. Ed.等国际顶级期刊发表 SCI 论文 280 余篇，被引用>12000 次，H 因子 58； 现招收“电沉积官能化介孔二氧化硅”方向博士研究生，详见下文。要求申请者有较好的英语听说读写能力，有电化学背景优先。 有意者请与Alain Walcarius联系：alain.walcarius@univ-lorraine.fr Generation of multilayer nanostructured silica films functionalized with redox entities and characterization of charge transfer reactions in insulating media Recent advances of Walcarius group (ELAN, analytical chemistry and electrochemistry) in the knowledge and control of mesoporous silica film deposits unambiguously show the potential of these organic-inorganic hybrid materials as electrode modifiers [1,2]. The association of electrochemistry with the sol-gel process makes it possible to obtain thin and regular films of mesoporous silica, with a hexagonal structure, and whose originality is based on an orientation of the pores perpendicular to the surface of the underlying support [2-4]. These unique characteristics contribute to extremely rapid transport of matter compared to poorly or unorganized materials [5]. The choice of chemical functions to be incorporated into the material is directly responsible for its surface properties. The “click chemistry” method recently applied within the ELAN group makes it possible to functionalize these mesostructured silicas by a very wide range of organic groups [6], enabling even the multiple functionalization on the same film [7]. The incorporation of molecules with redox properties is also possible and the species thus grafted within such an insulating matrix retain their electroactive character [8]. Such films can be also manufactured in multilayers [9]. In the context of recent developments in nanosciences, particularly on the modularity of molecular architectures or the chemical control and modification of materials at the nanometric scale, we now wish to go a bit further in understanding charge transfer reactions in electronic non-conductive media, with keeping in mind their possible interest in molecular electronics, notably for current rectification [10-12] or molecular diodes [13,14]. The main objective of this thesis work is to develop films of mesoporous silica oriented and organized in multilayers, of which each layer will then be selectively functionalized by distinct redox entities in order to be able to study the possible electron transfer reactions within each layer and to the interface between each of them. The approach proposed to form such films is a combination of the electrochemical generation of mesoporous silica multilayers [9] and the incorporation of electroactive groups (metallocenes) by click chemistry [6,7]. After having characterized these new hybrid materials, we will focus on studying the charge transfer mechanisms and diffusional processes in these confined environments by implementing different electrochemical techniques. This will lead to proposing films with multiple reactivity by combining different functions within the same multilayer material in order to be able to modulate its response to several stimuli or to glimpse molecular diode effects. The student will have a good knowledge of electrochemistry and if possible will have a background in organic/inorganic synthesis. Its integration into the ELAN team of the Laboratory of Physical Chemistry and Microbiology for Materials and the Environment (http://www.lcpme.cnrs-nancy.fr) will give him/her access to a large number of characterization techniques (electrochemistry, spectroscopies, surface analyzes) to meet the objectives of the thesis proposed here. The supervisor will be Alain Walcarius, a leading specialist in the electrochemistry of mesoporous materials [1,2]. [1] A. Walcarius, Chem. Soc. Rev., 2013, 42, 4098. [2] A. Walcarius, Acc. Chem. Res., 2021, 54, 3563. [3] A. Walcarius, S. Sibottier, M. Etienne, J. Ghanbaja, Nature Mater., 2007, 6, 602. [4] A. Goux, M. Etienne, E. Aubert, C. Lecomte, J. Ghanbaja, A. Walcarius, Chem. Mater., 2009, 21, 731. [5] M. Etienne, A. Goux, E. Sibottier, A. Walcarius, J. Nanosci. Nanotechnol., 2009, 9, 2398. [6] N. Vilà, J. Ghanbaja, E. Aubert, A. Walcarius, Angew. Chem. Int. Ed., 2014, 53, 2945. [7] N. Vilà, J. Ghanbaja, A. Walcarius, Adv. Mater. Interfaces, 2016, 3, 1500440. [8] N. Vilà, A. Walcarius, Electrochim. Acta, 2015, 179, 304. [9] G. Giordano, N. Vilà, E. Aubert, J. Ghanbaja, A. Walcarius, Electrochim. Acta, 2017, 237, 227. [10] B.V.V.S.P. Kumar, K.V. Rao, S. Sampath, S.J. George, M. Eswaramoorthy, Angew. Chem. Int. Ed., 2014, 53, 13073. [11] Y. Aceta, J.-F. Bergamini, C. Lagrost, P. Hapiot, Y.R. Leroux, Langmuir, 2018, 34, 2410. [12] L. Sun, L. Zhou, F. Yan, B. Su, Langmuir, 2019, 35, 14486. [13] B. Capozzi et al., Nature Nanotechnol. 2015, 10, 522. [14] X. Chen et al., Nature Nanotechnol. 2017, 12, 797. |
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