Marohn, John A. - Cornell University - Department of Chemistry and Chemical Biology

个人简介

John Marohn earned a B.S. in Chemistry and a B.A. in Physics from the University of Rochester (Rochester, New York), carried out his Ph.D. work with Daniel P. Weitekamp in the Division of Chemistry and Chemical Engineering at the California Institute of Technology (Pasadena, California), and did postdoctoral work as a U.S. National Research Council Postdoctoral Associate of the U.S. Army Research Laboratory (Adelphi, Maryland).John joined the Cornell faculty in 1999 and was promoted to Associate Professor in 2005. He is a member of the Cornell Center for Nanoscale Systems, the Cornell Center for Materials Research, and the Kavli Institute at Cornell for Nanoscale Science; he presently serves on the Executive Committees of the Cornell Center for Materials Research and the Cornell NanoScale Science and Technology Facility. Marohn has organized to and chaired two International Kavli Conferences on the topic of Routes to Three-Dimensional Imaging of Single Molecules.

研究领域

Analytical/Materials Chemistry/Physical Chemistry/Polymer Chemistry

Professor John Marohn's group is focused on imaging the structure and function of materials at the nanometer scale. We are pushing magnetic resonance imaging to nanoscale resolution in order to study individual biomolecules and are developing and applying tools to study charge in thin-film devices -- including the drift, diffusion, trapping, and generation of charge from light.

近期论文

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L. Chen, J. G. Longenecker, E. W. Moore, and J. A. Marohn, Magnetic resonance force microscopy detected long-lived spin magnetization, IEEE Trans. Magn., 2013, 49, 3528-3532. J. G. Longenecker, H. J. Mamin, A. W. Senko, L. Chen, C. T. Rettner, D. Rugar, and J. A. Marohn, High-gradient nanomagnets on cantilevers for sensitive detection of nuclear magnetic resonance, ACS Nano, 2012, 6, 9637 – 9645. D. A. Alexson, S. A. Hickman, J. A. Marohn, and D. D. Smith, Single-shot nuclear magnetization recovery curves with force-gradient detection, Appl. Phys. Lett., 2012, 101, 022103. S.-G. Lee, E. W. Moore, S. A. Hickman, J. G. Longenecker, and J. A. Marohn, Switching through intermediate states seen in a single nickel nanowire by cantilever magnetometry, J. Appl. Phys., 2012, 111, 083911. S.-G. Lee, E. W. Moore, and J. A. Marohn, A unified picture of cantilever frequency-shift measurements of magnetic resonance, Phys. Rev. B, 2012, 85, 165447. J. G. Longenecker, E. W. Moore, and J. A. Marohn, Rapid serial prototyping of magnet-tipped attonewton-sensitivity cantilevers by focused ion beam manipulation, J. Vac. Sci. Technol. B, 2011, 29, 032001. S. A. Hickman, E. W. Moore, S.-G. Lee, J. G. Longenecker, S. J. Wright, L. E. Harrell, and J. A. Marohn, Batch-fabrication of cantilevered magnets on attonewton-sensitivity mechanical oscillators for scanned-probe nanoscale magnetic resonance imaging, ACS Nano, 2010, 4, 7141 – 7150. E. W. Moore, S.-G. Lee, S. A. Hickman, L. E. Harrell, and J. A. Marohn, Evading surface and detector frequency noise in harmonic oscillator measurements of force gradients, Appl. Phys. Lett., 2010, 97, 044105. E. W. Moore, S.-G. Lee, S. A. Hickman, S. J. Wright, L. E. Harrell, P. P. Borbat, J. H. Freed, and J. A. Marohn, Scanned-probe detection of electron spin resonance from a nitroxide spin probe, Proc. Natl. Acad. Sci. U.S.A., 2009, 106, 22251 – 22256. D. de Roover, L. M. Porter II, A. Emami-Naeni, J. A. Marohn, S. Kuehn, S. Garner, and D. D. Smith, An all-digital cantilever controller for MRFM and scanned probe microscopy using a combined DSP/FPGA design, Amer. Laboratory, 2008, 40, 12. REVIEW: S. Kuehn, S. A. Hickman, and J. A. Marohn, Advances in mechanical detection of magnetic resonance, J. Chem. Phys., 2008, 128, 052208. D. de Roover, L. M. Porter II, A. Emami-Naeni, J. A. Marohn, S. Kuehn, S. Garner, and D. D. Smith , An all-digital cantilever controller for MRFM and scanned probe microscopy using a combined DSP/FPGA design. In Proceedings of the 10th NSTI Nanotech Conference, Santa Clara, CA, U.S.A., 2007. S. R. Garner, S. Kuehn, J. M. Dawlaty, N. E. Jenkins, and J. A. Marohn, Force-gradient detected nuclear magnetic resonance, Appl. Phys. Lett., 2004, 84, 5091 – 5093. N. E. Jenkins, L. P. DeFlores, J. Allen, T. N. Ng, S. R. Garner, S. Kuehn, J. M. Dawlaty, and J. A. Marohn, Batch fabrication and characterization of ultrasensitive cantilevers with submicron magnetic tips, J. Vac. Sci. Technol. B, 2004, 22, 909 – 915,[url]. J. G. Kempf and J. A. Marohn, Nanoscale Fourier-transform imaging with magnetic resonance force microscopy, Phys. Rev. Lett., 2003, 90, 087601. Scanned Probe Studies of Charge Trapping and Generation L. M. Smieska, V. A. Pozdin, J. L. Luria, R. G. Hennig, M. A. Hines, C. A. Lewis, and J. A. Marohn, Following chemical charge trapping in pentacene thin films by selective impurity doping and wavelength-resolved electric force microscopy, Adv. Funct. Mater., 2012, 22, 5096 – 5106. J. L. Luria, N. Hoepker, R. Bruce, A. R. Jacobs, C. Groves, and J. A. Marohn, Spectroscopic imaging of photopotentials and photoinduced potential fluctuations in a bulk heterojunction solar cell film, ACS Nano, 2012, 6, 9392 – 9401. REVIEW: J. R. O’Dea, L. M. Brown, N. Hoepker, J. A. Marohn, and S. Sadewasser, Scanned probe microscopy of solar cells: From inorganic thin films to organic photovoltaics, Mater. Res. Soc. Bulletin, 2012, 37, 642 – 650. J. J. Choi, W. Wenger, R. Hoffman, Y.-F. Lim, J. Luria, J. Jasieniak, J. A. Marohn, and T. Hanrath, Solution processed nanocrystal quantum dot tandem solar cells, Adv. Mater., 2011, 23, 3144 – 3148.