Presenter: Prof. Xinliang Feng
Technische Universitaet Dresden, Germany
Topic: Synthetic Two-Dimensional Soft Materials: A Fascinating Materials World
Time: 02:00PM, Oct. 13th (Thursday)
Location: Conference Room B, BLDG 909-1F
In the past decade, as inspired by the discovery of graphene, two-dimensional (2D) materials which possess a periodic network structure and with a topographical thickness of atomic/molecular level, have emerged as the new paradigm of materials with enormous potentials, ranging from electronics and optoelectronics to energy technology, membrane, sensing and biomedical applications. Various fabrication strategies have been developed to attain high quality 2D materials. Among of them, mechanical exfoliation remains the most popular protocol to isolate single-layer high quality 2D materials for fundamental physical studies. In contrast to the tremendous exploration of graphene and 2D inorganic materials such as metal dichalcogenides, metal oxides and nitrides, the study on 2D soft material systems including the bottom-up organic synthesis of graphene, 2D metal-organic frameworks, 2D polymers/supramolecular polymers as well as supramolecular approach to 2D organic nanostructures remains under development.
In this lecture, we will present our recent efforts on the bottom-up synthetic approaches towards novel 2D conducting polymers and supramolecular polymers with structural control at the atomic/molecular-level or at the meso-scale. First, we will briefly discuss the latest development on the synthesis of graphene nanostructures (nanoribbons) with atomically precise structures. Both solution and on-surface synthesis approaches have been established to fabricate planar graphene nanoribbons upon intramolecular cyclodehydrogenation of corresponding dendritic polyphenylene precursors. Second, we will demonstrate the synthetic 2D conjugated polymers including 2D Schiff-base type conjugated polymers and 2D metal-dithienene/diamine coordination supramolecular polymers at the air-water or liquid-liquid interfaces. The resulting 2D conjugated polymers exhibit single-layer feature, good local structural ordering and with a size of cm2. The functional exploration of such 2D single-layer conjugated polymers for the electrical and mechanical properties, as well as serving as efficient electrocatalytic water splitting catalysts will be demonstrated. Third, we will introduce the self-assembly of a host?guest enhanced donor?acceptor interaction, consisting of a tris(methoxynaphthyl)-substituted truxene spacer, and a naphthalene diimide substituted with N-methyl viologenyl moieties as donor and acceptor monomers, respectively, in combination with cucurbituril as host monomer toward monolayers of an unprecedented 2D supramolecular polymers at liquid-liquid interface. Finally, we will present the supramolecular approaches to synergetic control the multi-component assembly, which yield 2D conducting polymers, such as polypyrrole and polyaniline nanosheets featuring 2D structures and with adjustable mesopores with/without on various functional free-standing surfaces. The unique structure with adjustable pore sizes (5–20 nm) and thickness (35–45 nm), enlarged specific surface area as well as high electrical conductivity make 2D conducting polymers promising for a number of applications.
Xinliang Feng is a full professor at Technical University of Dresden. He received his Bachelor’s degree in analytic chemistry in 2001 and Master’s degree in organic chemistry in 2004. Then he joined Prof. Klaus Müllen's group at the Max Planck Institute for Polymer Research for PhD thesis, where he obtained his PhD degree in April 2008. Since December 2007, he was appointed as a group leader at the Max-Planck Institute for Polymer Research, and since 2012, he became a distinguished group leader at the Max-Planck Institute for Polymer Research. Since 2011, he was appointed as an adjunct distinguished professor at the Shanghai Jiao Tong University and as the director for the Institute of Advanced Organic Materials.
His current scientific interests include graphene, synthetic two-dimensional materials, organic conjugated materials, and carbon-rich molecules and materials for electronic and energy-related applications. He has published more than 300 research articles which have attracted more than 17000 citations with H-index of 64.
He has been awarded several prestigious prizes such as IUPAC Prize for Young Chemists (2009), Finalist of 3rd European Young Chemist Award, European Research Council (ERC) Starting Grant Award (2012), Journal of Materials Chemistry Lectureship Award (2013), ChemComm Emerging Investigator Lectureship (2014), Highly Cited Researcher (Thomson Reuters, 2014-2016), Fellow of the Royal Society of Chemistry (FRSC, 2014). He is the head of ESF group “Graphene Center Dresden”. He is an Advisory Board Member for Advanced Materials, Journal of Materials Chemistry A, Chemistry -An Asian Journal, ChemNanoMater, Energy Storage Materials, etc. He is also one of the Working Package Leaders for European commission’s pilot project Graphene Flagship.
Contact: Prof. Lifeng Chi