John  Cumings
A picture of John  Cumings University  of Maryland Logo

Assistant Professor
Department of Materials Science & Engineering
University of Maryland

Office phone: (301) 405-0789
Fax: (301) 314-8164
Lab phone:(301) 405-5827 (1314 CHE)
(301) 405-5832 (1309 CHE)
Email: <click to reveal>

Mailing Address:
Bldg. 90, Stadium Dr.
University of Maryland
College Park, MD 20742-2115

PhD, 2002, University of California at Berkeley
Curriculum Vitae

Honors and Awards:
CRC Press Freshman Chemistry Award (1994)
Boston University, College of Arts and Sciences Award for Excellence in Physics (1997)
Summa Cum Laude (1997)
Phi Beta Kappa (1997)
IBM Research Fellowship (2001-2002)
Minta Martin Award (2006)
The MSGS and MatES Award for Outstanding Advising in Materials Science and Engineering (2007)
Sigma Xi (2008)
NSF CAREER Award (2011)
A. James Clark School of Engineering Junior Faculty Outstanding Research Award (2011)

Research:
The current trend of miniaturization in virtually every industry is illuminating new questions about the behavior of matter on small length scales. When devices and systems of interest contain only a few thousand atoms, neither the fundamental theories of quantum mechanics nor theories of the continuum limit are practical for predicting dynamic behavior. This is the realm of nanoscience and nanotechnology, and it is here that basic notions of the physics of matter-- friction and wear, how electrons flow, and how heat is generated and dissipated, come into question. Ultimately, the guiding physical principles will come from direct observation of operational systems at the nanoscale.

The primary goal of my research is to advance the current understanding of the dynamic properties of nanoscale systems. The future of many fields of the physical and biological sciences lies in nanotechnology, and as the size of functional devices progresses ever smaller, there will inevitably be problems that can only be addressed by direct real-time observations. A number of research groups are focusing on using scanned probe techniques, such as scanning tunneling microscopy (STM) and atomic-force microscopy (AFM), to explore dynamic properties at the nanoscale, but these slow imaging techniques are poor at capturing these effects. My research goes beyond this approach by using real-time imaging techniques, such as transmission electron microscopy (TEM) to explore fundamental physics on small length scales.

To learn more about electron microscopy, visit the University of Maryland's NISP lab website.

Selected Publications:
1)Kamal H. Baloch, Norvik Voskanian, Merijntje Bronsgeest, and John Cumings, Remote Joule heating by a carbon nanotube, Nature Nanotechnology, 7(5), p. 316 (2012). pdf
News and Views
2)Khim Karki, Eric Epstein, Jeong-Hyun Cho, Zheng Jia, Teng Li, S. Tom Picraux, Chunsheng Wang, and John Cumings, Lithium-Assisted Electrochemical Welding in Silicon Nanowire Battery Electrodes, Nano Letters, 12(3), p. 1392 (2012). pdf
3)Stephen A. Daunheimer, Olga Petrova, Oleg Tchernyshyov, John Cumings, Reducing Disorder in Artificial Kagome Ice, Physical Review Letters, 107(16), 167201 (2011). pdf
4)Kamal H. Baloch, Norvik Voskanian, and John Cumings, Controlling the thermal contact resistance of a carbon nanotube heat spreader, Applied Physics Letters, 97(6), 063105 (2010). pdf
5)Todd Brintlinger, Yi Qi, Kamal H. Baloch, D. Goldhaber-Gordon, and John Cumings, Electron Thermal Microscopy, Nano Letters, 8(2), 582 (2008). pdf

Review and News Publications:
1)A. Zettl and John Cumings. Elastic properties of fullerenes, in Handbook of Elastic Properties of Solids, Liquids, and Gases, Levy, Bass, and Stern, Eds. (Academic Press, 2000) Chap. 11, p.163 pdf
2)John Cumings and A. Zettl, Electrical and Mechanical Properties of Nanotubes Determined using In-Situ TEM Probes, in Applied Physics of Nanotubes: Fundamentals of Theory, Optics and Transport Devices, Slava V. Rotkin, Shekhar Subramoney, Eds.; Series: Nanoscience and Nanotechnology, Ph. Avouris, Ser.Ed. (Springer Verlag GmbH & Co. KG, 2005) Chap. 11, p.273 pdf
3)John Cumings, Eva Olsson, Amanda K. Petford-Long, and Yimei Zhu, Electric and Magnetic Phenomena Studied by In-Situ Transmission Electron Microscopy, MRS Bulletin, 33(2), p. 101 (2008) pdf
4)John Cumings, Frustrated Magnets: Artificial ice goes thermal, Nature Physics, 7(1), p. 7 (2011) pdf
Research Publications:
1)John Cumings, P.G. Collins, and A. Zettl, Peeling and sharpening multiwall nanotubes. Nature, 406(6796), p.586 (2000) pdf
2)John Cumings, A. Zettl, Low-friction nanoscale linear bearing realized from multiwall carbon nanotubes. Science, 289(5479), p.602 (2000) pdf
3)John Cumings and A. Zettl, Mass-production of boron nitride double-wall nanotubes and nanococoons. Chemical Physics Letters, 316(3-4), p.211 (2000) pdf
4)M. Ishigami, John Cumings, A. Zettl, S. Chen, and U. Dahmen, A simple method for the continuous production of carbon nanotubes. Chemical Physics Letters, 319(5-6), p.457 (2000) pdf
5)E. A. Stach, T. Freeman, A. M. Minor, D. K. Owen, John Cumings, M. A. Wall, T. Chraska, R. Hull, J. W. Morris, A. Zettl, and U. Dahmen. Development of a nanoindenter for in situ transmission electron microscopy. Microscopy and Microanalysis, 7(6), p.507 (2001) pdf
6)W. Q. Han, John Cumings, X. S. Huang, K. Bradley, and A. Zettl, Synthesis of aligned BxCyNz nanotubes by a substitution-reaction route. Chemical Physics Letters, 346(5-6), p.368 (2001) pdf
7)W. Q. Han, John Cumings, and A. Zettl, Pyrolytically grown arrays of highly aligned BxCyNz nanotubes. Applied Physics Letters, 78(18), p.2769 (2001) pdf
8)B. G. Demczyk, John Cumings, A. Zettl, and R. O. Ritchie, Structure of boron nitride nanotubules. Applied Physics Letters, 78(18), p.2772 (2001) pdf
9)A. Zettl and John Cumings, Sharpened nanotubes, nanobearings, and nanosprings, in Electronic Properties of Novel Materials-- Molecular Nanostructures, H. Kuzmany, J. Fink, M. Mehring, and S. Roth, eds. (American Institute of Physics, New York, 2000) p.526 pdf
10)A. Zettl and John Cumings, Electromechanical properties of multiwall carbon nanotubes. In Nanonetwork Materials: Fullerenes, Nanotubes, and Related Systems, (AIP Conference Proceedings 590, American Institute of Physics, Melville, New York 2001) p.107 (2001) pdf
11)John Cumings, M. R. McCartney, J. C. H. Spence, and A. Zettl, Electron holography of field-emitting carbon nanotubes, in Electronic Properties of Molecular Nanostructures, H. Kuzmany, J. Fink, M. Mehring, and S. Roth, eds. (American Institute of Physics, New York, 2001) p.572 pdf
12)John Cumings and A. Zettl. Field emission properties of boron nitride nanotubes, in Electronic Properties of Molecular Nanostructures, H. Kuzmany, J. Fink, M. Mehring, and S. Roth, eds. (American Institute of Physics, New York, 2001) p.577 pdf
13)John Cumings, M. McCartney, J. C. H. Spence, and A. Zettl, Electron Holography of Field-Emitting Carbon Nanotubes, Physical Review Letters, 88(5), 056804 (2002) pdf
14)W. Mickelson, John Cumings, W. Q. Han, and A. Zettl, Effects of carbon doping on superconductivity in magnesium diboride. Physical Review B, 65(8), 052505 (2002) pdf
15)W. Q. Han, W. Mickelson, John Cumings, and A. Zettl, Transformation of BxCyNz nanotubes to pure BN nanotubes. Applied Physics Letters, 81(6), p.1110, 2002 Aug 5. pdf
16)B. G. Demczyk, Y. M. Wang, John Cumings, M. Hetman, W. Q. Han, A. Zettl, and R. O. Ritchie, Direct mechanical measurement of the tensile strength and elastic modulus of multiwalled carbon nanotubes. Materials Science & Engineering A-Structural Materials Properties Microstructure & Processing, 334(1-2), p.173 (2002) pdf
17)John Cumings and A. Zettl, Resistance of telescoping nanotubes, in Structural and Electronic Properties of Molecular Nanostructures, H. Kuzmany, J. Fink, M. Mehring, and S. Roth, eds. (American Institute of Physics, New York, 2002) p.227 pdf
18)A. Zettl, John Cumings, W. Q. Han, and W. Mickelson, Boron nitride nanotube peapods, in Structural and Electronic Properties of Molecular Nanostructures, H. Kuzmany, J. Fink, M. Mehring, and S. Roth, eds. (American Institute of Physics, New York, 2002) p.140 pdf
19)W. Mickelson, S. Aloni, Wei-Qiang Han, John Cumings, and A. Zettl, Packing C60 in Boron Nitride Nanotubes. Science, 300(5618), p.467 (2003) pdf
20)John Cumings, W. Mickelson, and A. Zettl, Simplified synthesis of double-wall carbon nanotubes. Solid State Communications, 126(6), p.359 (2003) pdf
21)Keith Bradley, John Cumings, Alexander Star, Jean-Christophe P. Gabriel, and George Grüner, Influence of mobile ions on nanotube based FET devices. Nano Letters, 3(5), p.639 (2003) pdf
22)A. M. Fennimore, T. D. Yuzvinsky, Wei-Qiang Han, M. S. Fuhrer, J. Cumings, A. Zettl, Rotational actuators based on carbon nanotubes. Nature, 424(6947), p.408 (2003) pdf
23)John Cumings and A. Zettl, Field emission and current-voltage properties of boron nitride nanotubes. Solid State Communications, 129(10), p.661 (2004) pdf
24)John Cumings and A. Zettl, Localization and nonlinear resistance in telescopically extended nanotubes, Physical Review Letters, 93(8), 086801 (2004) pdf
25)John Cumings, A. Zettl, and M. R. McCartney, Carbon Nanotube Electrostatic Biprism: Principle of Operation and Proof of Concept. Microscopy and Microanalysis, 10(4), p.420 (2004) pdf
26)John Cumings, L. S. Moore, H. T. Chou, K. C. Ku, G. Xiang, S. A. Crooker, N. Samarth, and D.Goldhaber-Gordon, A Tunable Anomalous Hall Effect in a Non-Ferromagentic System. Physical Review Letters, 96(19), 196404 (2006). pdf
27)C. H. L. Quay, John Cumings, S. J. Gamble, A. Yazdani, H. Kataura, and D. Goldhaber-Gordon, Transport properties of carbon nanotube C60 peapods. Physical Review B, 76(7), 073404 (2007). pdf
28)C. H. L. Quay, John Cumings, S. J. Gamble, R. de Picciotto, H. Kataura, and D. Goldhaber-Gordon, Magnetic field dependence of the spin-1/2 and spin-1 Kondo effects in a quantum dot, Physical Review B, 76(24), 245311 (2007). pdf
29)I-Kai Hsu, Rajay Kumar, Adam Bushmaker, Stephen B. Cronin, Michael T. Pettes, Li Shi, Todd Brintlinger, Michael S. Fuhrer, and John Cumings, Optical measurement of thermal transport in suspended carbon nanotubes, Applied Physics Letters, 92(6), 063119 (2008). pdf
30)Todd Brintlinger, Yi Qi, Kamal H. Baloch, D. Goldhaber-Gordon, and John Cumings, Electron Thermal Microscopy, Nano Letters, 8(2), 582 (2008). pdf
31)Yi Qi, T. Brintlinger, and John Cumings, Direct observation of the ice rule in artificial kagome spin ice, Physical Review B, 77(9), 094418 (2008). pdf
32)Todd Brintlinger, Sung-Hwan Lim, Kamal H. Baloch, Paris Alexander, Yi Qi, John Barry, John Melngailis, Lourdes Salamanca-Riba, I. Takeuchi, and John Cumings, In Situ Observation of Reversible Nanomagnetic Switching Induced by Electric Fields, Nano Letters, 10(4), p.1219 (2010). pdf
33)Kamal H. Baloch, Norvik Voskanian, and John Cumings, Controlling the thermal contact resistance of a carbon nanotube heat spreader, Applied Physics Letters, 97(6), 063105 (2010). pdf
34)Z. H. Han, B. Yang, Y. Qi, J. Cumings, Synthesis of low-melting-point metallic nanoparticles with an ultrasonic nanoemulsion method, Ultrasonics, 51, p.485 (2011). pdf
35)Xiao Hua Liu, He Zheng, Li Zhong, Shan Huang, Khim Karki, Li Qiang Zhang, Yang Liu, Akihiro Kushima, Wen Tao Liang, Jiang Wei Wang, Jeong-Hyun Cho, Eric Epstein, Shadi A. Dayeh, S. Tom Picraux, Ting Zhu, Ju Li, John P. Sullivan, John Cumings, Chunsheng Wang, Scott X. Mao, Sulin Zhang, Jian Yu Huang, Anisotropic swelling and fracture of silicon nanowires during lithiation, Nano Letters, 11(8), p.3312 (2011). pdf
36)Hongwei Liao, Khim Karki, Yin Zhang, John Cumings, and YuHuang Wang, Interfacial Mechanics of Carbon Nanotube@Amorphous-Si Co-axial Nanostructures, Advanced Materials, 23(37), p.4318 (2011). pdf
37)Jia Huang, Daniel R. Hines, Byung Jun Jung, Merijntje S. Bronsgeest, Andrew Tunnell, Vince Ballarotto, Howard E. Katz, Michael S. Fuhrer, Ellen D. Williams, John Cumings , Polymeric semiconductor/graphene hybrid field-effect transistors, Organic Electronics, 12(9), p.1471 (2011). pdf
38)Stephen A. Daunheimer, Olga Petrova, Oleg Tchernyshyov, John Cumings, Reducing Disorder in Artificial Kagome Ice, Physical Review Letters, 107(16), 167201 (2011). pdf
39)Dmitry Ruzmetov, Vladimir P. Oleshko, Paul M. Haney, Henri J. Lezec, Khim Karki, Kamal H. Baloch, Amit K. Agrawal, Albert V. Davydov, Sergiy Krylyuk, Yang Liu, Jian Yu Huang, Mihaela Tanase, John Cumings, and A. Alec Talin, Electrolyte Stability Determines Scaling Limits for Solid-State 3D Li Ion Batteries, Nano Letters, 12(1) p. 505 (2012). pdf
40)Khim Karki, Eric Epstein, Jeong-Hyun Cho, Zheng Jia, Teng Li, S. Tom Picraux, Chunsheng Wang, and John Cumings, Lithium-Assisted Electrochemical Welding in Silicon Nanowire Battery Electrodes, Nano Letters, 12(3), p. 1392 (2012). pdf
41)Kamal H. Baloch, Norvik Voskanian, Merijntje Bronsgeest, and John Cumings, Remote Joule heating by a carbon nanotube, Nature Nanotechnology, 7(5), p. 316 (2012). pdf
News and Views
42)Andrew Tunnell, Vincent Ballarotto, and John Cumings, The selective removal of metallic carbon nanotubes from As-grown arrays on insulating substrates, Applied Physics Letters, 101(19), 193109 (2012). pdf
43)Yichen Shen, Olga Petrova, Paula Mellado, Stephen Daunheimer, John Cumings, and Oleg Tchernyshyov, Dynamics of artificial spin ice: a continuous honeycomb network, New Journal of Physics, 14, 035022 (2012). pdf
44)J. Bavier, J. Cumings, and D. R. Hines, Transfer printing of patterned metal films using parylene C coated surfaces, Microelectronic Engineering, 104, p. 18 (2013). pdf
45)Kai He, Jeong-Hyun Cho, Yeonwoong Jung, S. Tom Picraux, and John Cumings, Silicon nanowires: electron holography studies of doped p-n junctions and biased Schottky barriers, Nanotechnology, 24, 115703 (2013). pdf
46)Jia Huang, Hongli Zhu, Yuchen Chen, Colin Preston, Kathleen Rohrbach, John Cumings, and Liangbing Hu, Highly Transparent and Flexible Nanopaper Transistors, ACS Nano, 7(3), p. 2106 (2013). pdf
47)Chuan-Fu Sun, Khim Karki, Zheng Jia, Hongwei Liao, Yin Zhang, Teng Li, Yue Qi, John Cumings, Gary W. Rubloff, and YuHuang Wang, A Beaded-String Silicon Anode, ACS Nano, 7(3), p. 2717 (2013). pdf
48)Kai He, Fei-Xiang Ma, Cheng-Yan Xu, and John Cumings, Mapping magnetic fields of Fe3O4 nanosphere assemblies by electron holography, Journal of Applied Physics, 113, 17B528 (2013). pdf
49)Khim Karki, Yujie Zhu, Yihang Liu, Chuan-Fu Sun, Liangbing Hu, YuHuang Wang, Chunsheng Wang, and John Cumings, Hoop-Strong Nanotubes for Battery Electrodes, ACS Nano, 9, p. 8295 (2013). pdf
50)Kai He and John Cumings, Diagnosing Nanoelectronic Components Using Coherent Electrons, Nano Letters, 13, p. 4815 (2013). pdf
51)Andrew Tunnell, Vincent Ballarotto, and John Cumings, A measurement technique for circumventing hysteresis and conductance drift in carbon nanotube field-effect transistors, Nanotechnology, 25, 045705 (2014). pdf