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巴黎西岱大學(xué)(巴黎七大)Dr. Xiaonan SUN課題組招2025CSC博士生
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巴黎西岱大學(xué)(巴黎七大)Dr. Xiaonan SUN課題組招2025CSC博士生 研究單位：界面處理組織和系統(tǒng)動(dòng)力學(xué)實(shí)驗(yàn)室（ITODYS） 要求： 化學(xué)或者物理化學(xué)背景，2024年7月份取得碩士學(xué)位，最好有托福或雅思成績(jī)，CSC（公派）項(xiàng)目留學(xué)生。 課題主要方向是分子電子學(xué)，儀器涉及掃描隧道顯微鏡（STM），原子力顯微鏡（AFM），電化學(xué)工作站等。如有意向望盡快郵件導(dǎo)師Dr. Xiaonan Sun。Dr. Xiaonan Sun教授是個(gè)專注于科研的老師，平易近人，科研成果較好，在J. Am. Chem. Soc.和Nano Letter, Nanoscale, JPCL等學(xué)術(shù)雜志上發(fā)表多篇文章。 導(dǎo)師認(rèn)真負(fù)責(zé)，關(guān)心留學(xué)生，不論在科研還是生活都給了大家很多幫助，對(duì)想出國讀博的同學(xué)是很好的機(jī)會(huì)。 聯(lián)系方式：Xiaonan Sun: sun.xiaonan@u-paris.fr 詳細(xì)官方研究計(jì)劃如下，同時(shí)歡迎郵件咨詢。 Title: Charge transport properties of single molecular junctions Keywords: Charge transport properties, single molecule junction, Scanning tunneling microscope, diazonium reduction, conductance switching Type de financement demandé : 4 ans de thèse Equipe d’accueil : équipe nanoelectrochimie –ITODYS, UMR 7086, Université Paris Cité (Paris 7) Pôle : Sciences Exactes et Technologie / Exact Sciences and Technology Ecole doctorale : ED 388 - Chimie Physique et Chimie Analytique de Paris-Centre Langue de Travail : Anglais Direction : Dr. Xiaonan Sun Contact email: sun.xiaonan@u-paris.fr Project: 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 improve the SMJ stability, an important strategy is to step-wise modify the molecule/electrode contacts[3-4] from weak to strong. Rigid porphyrin-based SMJs will be built and compared with: weak top/molecule and strong covalent molecule/bottom contacts (C-Au or C-C bindings); and double covalent molecule/electrodes contacts. The life time of the SMJ is expected 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 for storage. The selected molecules which have not only multiple well-defined and stable states with distinctively tunable electronic properties [8-12], but can also 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). Single molecule hysteretic I/V loops will be a direct proof of electric field generated SMJ conductance switching. A few factors such as the junction length, the modification of central molecular core with extra redox-active units are foreseen to involve multi states conductance switches and are hence expected to give high ON/OFF ratios above 1000. Overall, the ultimate and essential goal of the phd project is to build super-stable, multi-switchable SMJs with electric field generated conductance switching with high ON/OFF ratio for developing storage devices. Main teams of the field: The main teams of charge transport properties of single molecule junctions are: (i) I. Díez-Pérez, Department of Chemistry, University of King’s College London, England (ii) L.Venkataraman, Columbia University, USA (iii) H. Van der Zant, Delft University of Technology, the Netherlands (iv) W. J. Hong, Xiaoment University, China The PI of this project is expert on charge transport properties of single molecule junction and on Scanning tunneling microscopy to image molecular reactivities on surface. Using the experiences of the PI, two main target including the improvement of SMJ stability and the investigation of single molecule conductance switching will be mainly investigated. The scientific results can be used for the optimization of single molecule-based devices such as memory or storage. [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). [12] X. Yao, M. Vonesch, M. Combes, J. Weiss, X. Sun*, and J. C. Lacroix. Single-Molecule Junctions with Highly Improved Stability. J. Mate. Chem. C, 12 (12), 4326 (2024). |
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