• Investigations of mesoscale and nanoscale materials by novel scanned- probe microscopies
• Formulate new techniques more capable of answering both fundamental and applied questions in mesoscale and nanoscale materials
• Scanned-probe microscopes
  

To search PubMed for articles by “JA Marohn” click here.

• 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, [url].
• 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, [url].
• 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, [url].
• S. Lekkala, N. Hoepker, J. A. Marohn, and R. F. Loring, Charge carrier dynamics and interactions in electric force microscopy, J. Chem. Phys., 2012, 137, 124701, [url].
• 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, [url].
• 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, [url].
• 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, [url].
• 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, [url].
• 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, [url].
• N. Hoepker, S. Lekkala, R. F. Loring, and J. A. Marohn, Dielectric fluctuations over polymer films detected using an atomic force microscope, J. Phys. Chem. B, 2011, 115, 14493 – 14500, [url].
• 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, [url].
• J. L. Luria, K. A. Schwarz, M. J. Jaquith, R. G. Hennig, and J. A. Marohn, Spectroscopic characterization of charged defects in polycrystalline pentacene by time- and wavelength-resolved electric force microscopy, Adv. Mater., 2011, 23, 624 – 628, [url].
• J. J. Choi, J. Luria, B.-R. Hyun, A. C. Bartnik, L. Sun, Y.-F. Lim, J. A. Marohn, F. W. Wise, and T. Hanrath, Photogenerated exciton dissociation in highly coupled lead salt nanocrystal assemblies, Nano Lett., 2010, 10, 1805 – 1811, [url].
• 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, [url].
• 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, [url].
• M. J. Jaquith, J. E. Anthony, and J. A. Marohn, Long-lived charge traps in functionalized pentacene and anthradithiophene studied by time-resolved electric force microscopy, J. Mater. Chem., 2009, 19, 6116 – 6123, [url].
• 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, [url].
• S. M. Yazdanian, N. Hoepker, S. Kuehn, R. F. Loring, and J. A. Marohn, Quantifying electric field gradient fluctuations over polymers using ultrasensitive cantilevers, Nano Lett., 2009, 9, 2273 – 2279, [url].
• 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.
• S. Kuehn, S. A. Hickman, and J. A. Marohn, Advances in mechanical detection of magnetic resonance, J. Chem. Phys., 2008, 128, 052208, [url].
• G. G. Malliaras, J. D. Slinker, J. A. DeFranco, M. J. Jaquith, W. R. Silveira, Y.-W. Zhong, J. M. Moran-Mirabal, H. G. Craighead, H. D. Abruña, and J. A. Marohn, Operating mechanism of light-emitting electrochemical cells – Authors’ response, Nat. Mater., 2008, 7, 168, [url].
• S. M. Yazdanian, J. A. Marohn, and R. F. Loring, Dielectric fluctuations in force microscopy: Noncontact friction and frequency jitter, J. Chem. Phys., 2008, 128, 224706, [url].
• 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, [url].
• M. Jaquith, E. M. Muller, and J. A. Marohn, Time-resolved electric force microscopy of charge trapping in polycrystalline pentacene, J. Phys. Chem. B, 2007, 111, 7711 – 7714, [url].
• T. N. Ng, W. R. Silveira, and J. A. Marohn, Dependence of charge injection on temperature, electric field, and energetic disorder in an organic semiconductor, Phys. Rev. Lett., 2007, 98, 066101, [url].
• W. R. Silveira, E. M. Muller, T. N. Ng, D. H. Dunlap, and J. A. Marohn in Scanning Probe Microscopy: Electrical and Electromechanical Phenomena at the Nanoscale, ed. S. V. Kalinin and A. Gruverman, Vol.  II; Springer Verlag, New York, 2007; pp. 788 – 830.
• J. D. Slinker, J. A. DeFranco, M. J. Jaquith, W. R. Silveira, Y.-W. Zhong, J. M. Moran-Mirabal, H. G. Craighead, H. D. Abruña, J. A. Marohn, and G. G. Malliaras, Direct measurement of the electric-field distribution in a light-emitting electrochemical cell, Nat. Mater., 2007, 6, 894 – 899, [url].
• S. Kuehn, R. F. Loring, and J. A. Marohn, Dielectric fluctuations and the origins of noncontact friction, Phys. Rev. Lett., 2006, 96, 156103, [url].
• S. Kuehn, J. A. Marohn, and R. F. Loring, Noncontact dielectric friction, J. Phys. Chem. B, 2006, 110, 14525 – 145258, [url].
• T. N. Ng, N. E. Jenkins, and J. A. Marohn, Thermomagnetic fluctuations and hysteresis loops of magnetic cantilevers for magnetic resonance force microscopy, IEEE Trans. Mag., 2006, 42, 378 – 381, [url].
• T. N. Ng, J. A. Marohn, and M. L. Chabinyc, Comparing the kinetics of bias stress in organic field-effect transistors with different dielectric interfaces, J. Appl. Phys., 2006, 100, 84505, [url].
• T. N. Ng, W. R. Silveira, and J. A. Marohn, Non-ideal behavior in a model system: Contact degradation in a molecularly doped polymer revealed by variable-temperature electric force microscopy, Proc. SPIE, 2006, 6336, 63360A, [url].
• E. M. Muller and J. A. Marohn, Microscopic evidence for spatially inhomogeneous charge trapping in pentacene, Adv. Mater., 2005, 17, 1410, [url].
• 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, [url].
• 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].
• A. J. McNeil, G. E. S. Toombes, S. V. Chandramouli, B. J. Vanasse, T. A. Ayers, M. K. O’Brien, E. Lobkovsky, S. M. Gruner, J. A. Marohn, and D. B. Collum, Characterization of β-amino ester enolates as hexamers via ⁶Li NMR spectroscopy, J. Am. Chem. Soc., 2004, 126, 5938 – 5939, [url].
• W. R. Silveira and J. A. Marohn, Microscopic view of charge injection in an organic semiconductor, Phys. Rev. Lett., 2004, 93, 116104, [url].
• J. G. Kempf and J. A. Marohn, Nanoscale Fourier-transform imaging with magnetic resonance force microscopy, Phys. Rev. Lett., 2003, 90, 087601, [url].
• W. R. Silveira and J. A. Marohn, A vertical inertial coarse approach for variable temperature scanned probe microscopy, Rev. Sci. Instrum., 2003, 74, 267 – 269, [url].

• D. D. Smith, J. A. Marohn, and L. E. Harrell, Detailed description of a compact cryogenic magnetic resonance force microscope, Rev. Sci. Instrum., 2001, 72, 2080 – 2089, [url].
• J. A. Marohn, R. Fainchtein, and D. D. Smith, Mechanical modulation of sample magnetization in magnetic resonance force microscopy, J. Appl. Phys., 1999, 86, 4619 – 4625, [url].
• J. A. Marohn, R. Fainchtein, and D. D. Smith, An optimal magnetic tip configuration for magnetic-resonance force microscopy of microscale buried features, Appl. Phys. Lett., 1998, 73, 3778 – 3780, [url].

• J. G. Kempf, J. A. Marohn, P. J. Carson, D. A. Shykind, J. Y. Hwang, M. A. Miller, and D. P. Weitekamp, An optical NMR spectrometer for Larmor-beat detection and high-resolution POWER NMR, Rev. Sci. Instrum., 2008, 79, 063904, [url].
• J. A. Marohn I. Multiple-pulse radio-frequency gradient nuclear magnetic resonance imaging of solids; II. Optical nuclear magnetic resonance analysis of epitaxial gallium arsenide structures. PhD thesis, California Institute of Technology, Pasadena, California, 1996, [url].
• J. A. Marohn, P. J. Carson, J. Y. Hwang, M. A. Miller, D. N. Shykind, and D. P. Weitekamp, Optical Larmor beat detection of high-resolution nuclear magnetic resonance in a semiconductor heterostructure, Phys. Rev. Lett., 1995, 75, 1364 – 1367, [url].
• J. A. Marohn, D. N. Shykind, M. H. Werner, and D. P. Weitekamp Advances in multiple-pulse radio-frequency-gradient imaging of solids. In ed. D. O. Thomson and D. E. Chimenti, Review of Progress in Quantitative Nondestructive Evaluation, Vol. 12A, pp. 687 – 694. Plenum Publishing Corporation, New York, 1993.

• R. Hake, Q. P. Zhang, J. Marohn, G. McLendon, and A. Corin, The dynamics and oxidation-state dependence of complex-formation between Cytochrome c Peroxidase and Cytochrome c, Molec. Cryst. Liq. Cryst., 1992, 194, 351 – 356, [url].
• J. S. Bashkin, G. McLendon, S. Mukamel, and J. Marohn, Influence of medium dynamics on solvation and charge separation reactions: Comparison of a simple alcohol and a protein “solvent”, J. Phys. Chem., 1990, 94, 4757 – 4761, [url].
• M. O’Neil, J. Marohn, and G. McLendon, Dynamics of electron-hole pair recombination in semiconductor clusters, J. Phys. Chem., 1990, 94, 4356 – 4363, [url].
• M. O’Neil, J. Marohn, and G. McLendon, Picosecond measurements of exciton trapping in semiconductor clusters, Chem. Phys. Lett., 1990, 168, 208 – 210, [url].
• Q. P. Zhang, J. Marohn, and G. McLendon, Macromolecular recognition in the Cytochrome c–Cytochrome c Peroxidase complex involves fast two-dimensional diffusion, J. Phys. Chem., 1990, 94, 8628 – 8630, [url].

• PhD, California Institute of Technology, 1996

• BS, University of Rochester, 1989

• BA, University of Rochester, 1989

• NSF Career Award 2002