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巴黎西岱大学Prof. Xiaonan SUN, Prof. Jean-Christophe LACROIX招2024CSC博士生
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单位：巴黎西岱大学ITODYS nano electrochemistry 实验室 要求： 化学或者物理化学背景，2024年3月份前取得硕士学位，最好有托福或雅思成绩，CSC（公派）项目留学生。 课题主要方向是分子电子学，仪器涉及扫描隧道显微镜（STM），原子力显微镜（AFM），如有意向望尽快邮件导师Dr. Xiaonan Sun。Dr. Xiaonan Sun教授是个专注于科研的老师，平易近人，科研成果较好，每年都有数量可观的文章发表，特别是一区文章。在J. Am. Chem. Soc.和Nano Letter, Nanoscale, JPCL等学术杂志上发表多篇文章。 本人是课题组博士生，导师认真负责，关心留学生，不论在科研还是生活都给了大家很多帮助。并且该课题在组里进展良好，文章质量和数量一直不错，所以对想出国读博的同学是很好的机会。 联系方式：Xiaonan Sun: sun.xiaonan@u-paris.fr 研究计划如下，更详细的可以查阅附件或者邮件询问导师。欢迎大家联系申请！ Phd Thesis: Charge transport properties of single molecular junctions Type of funding requested: 4 years Host group and laboratory: nanoelectrochemistry, ITODYS , Université Paris Cité (Paris 7) Doctoral school: ED 388 -Physical Chemistry and Analytical Chemistry Working Language: English Direction: Dr. Xiaonan Sun/Prof. J.C. LacroixContact email: sun.xiaonan@u-paris.fr The basic component of molecular devices is a molecular junction and the continuous downsizing of electrodes to a limit of 10 nm emphasizes the need for stable junctions at the single molecule level.As a result, the study of the transport properties of single molecular junctions (SMJ) has attracted broad and significant research interests in the past decades. In this respect, scanning tunneling microscopy break junction technique (STM-bj) will be used to construct and to study the charge transport properties and functionalities for future molecular memory and diode, the proposed phd project will mainly focus on the following points: Part I: The conductivity will be studied by STM-bj with the target to improve their stability Functional molecules with active anchoring groups are selected in investigating the single molecular junctions. STM-based break junction (BJ) measurements will be performed where STM tip will be controlled to crash on molecule decorated the surface and to pull-out the metal-molecule-metal junctions. Conductance-vs-extension (I(d)) curves will be extracted while pulling-out the junctions and will allow the measurements of the conductance of a single molecule.[1,2] The phd project will be to study singlemolecular conductance with improved stability by improving the molecule/electrode contacts using various anchoring. [3-4]The life time of the SMJ isexpected to be largely improved [5] (into minutes or hours) and the electric contacts to be optimized for a better performance of the junctions. The result of Part I will provide well-define method to achieve very stable SMJ for the following functionality characterization. Part II: SMJs with functionalities for memory The formation and the conductance measurement of SMJs with potential applicable functionalities for real-life devices are [essential. Multi-states molecules [6-7] are appealing candidates for the design of molecular devices, such as memristors. The selected molecules which have not only multiple well-defined and stable states with distinctively tunable electronic properties [8-11], but canalso and more importantly, be switched by different means such as light, heat or electrical stimulation. The target molecules will be then appropriately connected inside a SMJ (using the methods achieved in part I). Different conduc(ON) and conduc(OFF) values will be measured using STM-bj technique and reliable single molecule I/V curves will be recorded for the investigation of single molecule memory effect. [1] B. Xu, N. J. Tao, Science 301, 1221-1223 (2003). [2] D. Xiang, X. Guo, et. al. Chem. Rev., 116, 4318 (2016). [3] V. Q. Nguyen, X. Sun, F. Lafolet, F. F. Audibert; F. Miomandre, G. Lemercier, F. Loiseau, J. C. Lacroix, J. Am. Chem. Soc. 138, 9381 (2016). [4] X. Yao, X. Sun, F. Lafolet, J.C. Lacroix, Nano Lett. 20, 6899 (2020). [5] X. Yao, X. Sun, J. Weiss, J.-C. Lacroix et al. Nano Lett. 21, 6540 (2021) [6] I. Hnid, X. Sun, D. Frath, F. Lafolet, J. C. Lacroix, Nanoscale 11, 23042 (2019) [7] I. Hnid, L. Guan, E. Chatir, S. Cobo, F. Lafolet, F. Maurel, JC. Lacroix, X. Sun, Nanomaterials 12 (8), 1318 (2022) [8] Q. V. Nguyen, P. Martin, D. Frath, M. L. Della Rocca, F. Lafolet, C. Barraud, P. Lafarge, V. Mukundan, D. James, R.L McCreery, J. C. Lacroix, J. Am. Chem. Soc. 139 , 11913(2017). [9] I. Hnid, D.Frath, F. Lafolet, X. Sun, J. C. Lacroix, J. Am. Chem. Soc. 142 7732(2020). [10] Q. V. Nguyen, P. Martin, D. Frath, M.L. Della Rocca, F. Lafolet, S. Bellinck, P. Lafarge, J.C. Lacroix, J. Am. Chem. Soc. 140,10131(2018). [11] I. Hnid, M. Liu, D. Frath, S. Bellynck, F. Lafolet, X. Sun, J.C. Lacroix , Nano Letters 21 (18), 7555 (2021). |
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