个人简介

B.S., University of Oregon, 1990. Ph.D., Northwestern University, 1994 (Duward F. Shriver and Mark A. Ratner). Postdoctoral: California Institute of Technology, 1994–96 (Nathan S. Lewis). Honors and Awards: NSF Predoctoral Fellow, 1990–93; A. A. Noyes Postdoctoral Fellow, 1995; ACS/Proctor and Gamble Graduate Award in Physical Chemistry, 1995; Dreyfus New Faculty Award, 1996; NSF CAREER Award, 1997; Beckman Young Investigator Award, 1998; Camille Dreyfus Teacher-Scholar Award, 2001. At Oregon since 1996.

研究领域

Environmental Chemistry/Materials Chemistry/Polymer Chemistry/Physical Chemistry/Surface & Interfacial Chemistry

Research in the Lonergan group blends synthesis, physical measurement and rational design to better understand or discover interesting electrical and electrochemical phenomena in solid-state systems. We are particularly interested in using chemistry to control interfacial electron transfer processes, which can depend on applied bias in complex, nonlinear, and often asymmetric ways. Practical impetus for our work comes from the importance of electroactive interfaces to many devices for the useful manipulation of electrical energy including solar cells, batteries, fuel cells, and logic gates. One focus area is the family of polymers known as conjugated ionomers. These materials are defined by a -conjugated backbone and covalently bound ionic functionality. A prototypical example is given by the polyacetylene ionomer shown below: This polymer is one of a much broader set of materials synthesized in our laboratory using ring-opening metathesis polymerization. Conjugated ionomers are unusual materials. Unlike conventional polymers, they are electrically active. Furthermore, they blend the properties of typical electronic conductors, such as graphite, with ionic conductors, such as brine. Electrical conductivity comes from the ability of the -conjugated backbone to support the addition or removal of electrons, and ionic conductivity comes from the presence of ionic functionality. The mixed ionic/electronic nature of conjugated ionomers results in extremely rich solid-state electrochemical behavior, and it is at the heart of a number of important discoveries within the Lonergan group. These include new mechanisms of unidirectional charge transport, new approaches to modulating the conductivity of organic conductors, and the first example of a conjugated polymer pn homojunction – a crucial building block for semiconductor electronics. The above discoveries raise many fundamental issues now being addressed regarding the interplay between ionic and electronic processes in solid-state mixed ionic/electronic conductors; the relation of interfacial charging to redox chemistry in nanoscale systems that blur these two processes; and the use of ions to engineer regions of space charge and subsequently control interfacial charge transfer. They also drive efforts toward even more sophisticated polymer structures where multiple features are built into a single polymer through copolymerization or other means. These more sophisticated structures target molecular-level analogues to the types of junctions that form the basis for modern semiconductor electronics. A second important area being explored in the group deals with the electrical and electrochemical properties of nanostructures. Charge transport and photoinduced charge separation are being studied in a variety of systems. Two examples are blends of semiconductor nanoparticles with conjugated polymers and planar interfaces with well-defined lateral nanostructure defined using electron beam lithography. The Lonergan group is made up of researchers with diverse backgrounds ranging from synthetic organic chemistry to applied physics. Students in the group draw on classic topics from chemistry (physical, organic, and inorganic), physics and more specialized areas such as polymer chemistry, electrochemistry, and semiconductor device physics. Major tools used by the group include a wide variety of electrical and electrochemical methods, organic and polymer chemistry, techniques for molecular and polymer characterization, numerical simulation, and electron beams for lithography and imaging.

近期论文

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K.J. Karki, J. R. Widom, J. Seibt, I. Moody, M.C. Lonergan, T. Pullerits, A.H. Marcus, "Coherent two-dimensional photocurrent spectroscopy in a PbS quantum dot photocell," Nature Communications 5, 5869 (2014) DOI:10.1038/ncomms6869 J. Li, D.R. Diercks, T.R. Ohno, C.W. Warren, M.C. Lonergan, J.D. Beach, C.A. Wolden, "Controlled activiation of ZnTe:Cu contacted CdTe solar cells using rapid thermal processing" 133, 208 (2015). DOI:10.1016/j.solmat.2014.10.045 C.D. Weber, C. Bradley, E.M. Walker, S.G. Robinson, M.C. Lonergan, "Increased Performance of Inverted Organic Photovoltaics Using a Cationically functionalized Fullerene Interfacial Layer," Solar Energy Materials and Solar Cells 129, 90 (2014). DOI:10.1016/j.solmat.2014.03.034 J.W. Boucher, D.W. Miller, C.W. Warren, J.D. Cohen, B.E. McCandless, J.T. Heath, M.C. Lonergan, S.W. Boettcher "Optical response of deep defects as revealed by transient photocapacitance and photocurrent spectroscopy in CdTe/CdS solar cells," Solar Energy Materials and Solar Cells," 129, 57 (2014). DOI: 10.1016/j.solmat.2014.02.024 C.D. Weber, C. Bradley, M.C. Lonergan, "Solution phase n-doping of C60 and PCBM using tetrabutylammonium fluoride," J. Mater. Chem. A 2, 303 (2014). DOI: 10.1039/C3TA14132B Ethan M. Walker and Mark C. Lonergan, "Characterizing Charge Injection, Transport, and Mobility in a Conjugated Polyelectrolyte by NIR Absorbance," J. Phys. Chem. C 117, 14929 (2013). DOI: 10.1021/jp402146d. J.A. Haack, J.A. Berglund, J.E. Hutchison, D.W. Johnson, M.C. Lonergan, and D.R. Tyler, ConfChem Conference on Educating the Next Generation: Green and Sustainable Chemistry—Chemistry of Sustainability: A General Education Science Course Enhancing Students, Faculty and Institutional Programming, J. Chem. Ed. 90, 515 (2013). DOI: 10.1021/ed2006899. S. G. Robinson and M. C. Lonergan, "Polyacetylene p-n junctions with varying dopant density by polyelectrolyte-mediated electrochemistry," J. Phys. Chem. C 117, 1600 (2013). DOI: 10.1021/jp309534b D. Stay and M.C. Lonergan, "Varying Anionic Functional Group Density in Sulfonate-Functionalized Polyfluorenes by a One-Phase Suzuki Polycondensation," Macromolecules 46, 4361 (2013). DOI: 10.1021/ma4004693 D.T. Chase, A.G. Fix, S.J. Kang, B.D. Rose, C.D. Weber, Y. Zhong, L. Zakharov, M.C. Lonergan, C. Nuckolls, M.M. Haley, "6,12-Diarylindeno[1,2-b]fluorenes: Syntheses, Photophysics, and Ambipolar OFETs," J. Amer. Chem. Soc.134, 10349 (2012). S. G. Robinson and M.C. Lonergan, "Ionically Functionalized Polyacetylenes,'' in Conjugated Polyelectrolytes: Fundamentals and Applications (eds B. Liu and G. C. Bazan), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany (2012). C.D. Weber, S.G. Robinson, D.P. Stay, C.L. Vonnegut, and M. C. Lonergan, "Ionic Stabilization of the Polythiophene-Oxygen Charge-Transfer Complex" ACS Macro Letters 1, 499 (2012) DOI: 10.1021/mz300046x T.J. Mills, and M.C. Lonergan, "Charge injection and transport in low-mobility mixed ionic/electronic conducting systems: Regimes of behavior and limiting cases" Phys. Rev. B *85, 035203 (2012) DOI: 10.1103/PhysRevB.85.035203 D.T. Chase, A.G. Fix, B.D. Rose, C.D. Weber, S. Nobusue, C. E. Stockwell, L. N. Zakharov, M. C. Lonergan, M. M. Haley, "Electron-Accepting 6,12-Diethynylindeno[1,2-b]fluorenes: Synthesis, Crystal Structures, and Photophysical Properties" Angew. Chem. 50, 11103 (2011) DOI: 10.1002/anie.201104797 C.D. Weber, S.G. Robinson, and M.C. Lonergan, "Ionic Functionality and the Polyacetylene–Oxygen Charge-Transfer Complex," Macromolecules 44, 4600 (2011) DOI: 10.1021/ma200932y B.D. Rose, D.T. Chase, C.D. Weber, L.N. Zakharov, M.C. Lonergan, M.M. Haley, "Synthesis, Crystal Structures, and Photophysical Properties of Electron-Accepting Diethynylindenofluorenediones," Org. Lett. 13, 2106 (2011) DOI:10.1021/ol200525g D.P. Stay, S.G. Robinson, M.C. Lonergan in Iontronics, "Development and Application of Ion-functionalized Conjugated Polymers," edited by J. Leger, M. Berggren, and S. Carter (CRC Press, Taylor and Francis Group, Boca Raton, Fl, 2011). L. Truong, I.S. Moody, D.P. Stankus, J.A. Nason, M.C. Lonergan, R.L. Tanguay, "Differential Stability of Lead Sulfide Nanoparticles Influences Biological Responses in Embryonic Zebrafish," Arch Toxicol, 85, 787 (2010) DOI 10.1007/s00204-010-0627-4 F. Lin, E.M. Walker, M.C. Lonergan, "Photochemical Doping of an Adaptive Mix-Conducting p-n Junction," J. Phys. Chem. Lett. 1, 720 (2010) DOI:10.1021/jz900430y Dean H. Johnston, Lei Gao, and Mark C. Lonergan, "Kinetic study of the ring-opening metathesis copolymerization of ionic with nonionic cyclooctatetraene derivatives to yield polyacetylene ionomers," Macromolecules 43, 2676 (2010) DOI:10.1021/ma100034h