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Research Highlights


Direct Determination of the Chemical Bonding of Individual Impurities in Graphene

Wu Zhou, Myron D. Kapetanakis, Micah P. Prange, Sokrates T. Pantelides, Stephen J. Pennycook, and Juan-Carlos Idrobo.

Physical Review Letters 109, 206803 (2012).


Origin of nanopores in graphene-based carbon materials

Junjie Guo, James R. Morris, Yungok Ihm, Cristian I. Contescu, Nidia C. Gallego, Gerd Duscher, Stephen J. Pennycook, and Matthew F. Chisholm.

Small 8, 3283-3288, (2012)


Combining diffraction theory with electronic-structure theory of solids to decode electron-energy-loss spectra

M. P. Prange, M. P. Oxley, M. Varela, S. J. Pennycook, and S. T. Pantelides.

Physical Review Letters 109, 246101 (2012)


Atomic-scale optoelectronic devices: The case of substitutional Si atoms in monolayer graphene

W. Zhou. J. Lee, J. Nanda, S.J. Pennycook, S.T. Pantelides, and J.-C. Idrobo,

Nature Nanotechnology, DOI: 10.1038/NNANO.2011.252 (2012)


Fluctuations in ultrasmall nanocrystals induce white light emission

T. J. Pennycook, J. R. McBride, S. J. Rosenthal, S. J. Pennycook, S. T. Pantelides.

Nanoletters 12, 3038−3042 (2012)


An oxygen reduction electrocatalyst based on carbon nanotube–graphene complexes

Y. Li, W. Zhou, H. Wang, L. Xie, Y. Liang, F. Wei, J.C. Idrobo, S.J. Pennycook, and H. Dai.

Nature Nanotechnology 7, 394–400 (2012)


Atomic scale magnetism:  seeing spin state?

J. Gazquez, W. Luo, M. P. Oxley, M. Prange, M. A. Torija, M. Sharma, C. Leighton, S. T. Pantelides, S. J. Pennycok, M. Varela.

Nanoletters 11, 973-976 (2011)


Mapping dielectric response and charge distribution on the atomic scale reveals the origin of conductivity at the LAO/STO interface

C. Cantoni, J. Gazquez, F. Miletto Granozio, M. P. Oxley, M. Varela, A. R. Lupini, S. J. Pennycook, C. Aruta, U. Scotti di Uccio, P. Perna, and D. Maccariello.

Advanced Materials, published online: 19 JUN 2012, DOI: 10.1002/adma.201200667.


Optimizing Li diffusion in LiFePO4: The key role of Fe antisite defect clustering

J. Lee, W. Zhou. J.-C. Idrobo, S.J. Pennycook, and S.T. Pantelides, Vacancy-driven anisotropic defect distribution in the novel battery-cathode material LiFePO4.

Phys. Rev. Lett. (2011)


Sub-nanometer electron probes map magnetism at the nanoscale

J. Salafranca, J. Gazquez, N. Perez, A. Labarta, S. T. Pantelides, S. J. Pennycook, X. Batlle, M. Varela.

Nanoletters 12, 2499-2503 (2012)


Atom-by-atom analysis

Ondrej L. Krivanek, Matthew F. Chisholm, Valeria Nicolosi, Timothy J. Pennycook, George J. Corbin, Niklas Dellby, Matthew F. Murfitt, Christopher S. Own, Zoltan S. Szilagyi, Mark P. Oxley, Sokrates T. Pantelides, and Stephen J. Pennycook

Nature, 464, 571 (2010)


Direct Imaging of Nanoscale Phase Separation in La0.55Ca0.45MnO3: Relationship to Colossal Magnetoresistance

J. Tao, D. Niebieskikwiat, M. Varela, W. Luo, M. Schofield, Y. Zhu, M.B. Salamon, J.M. Zuo, S.T. Pantelides, S.J. Pennycook

Phys. Rev. Lett. 103, 097202 (2009)


Identification and lattice location of oxygen impurities in α-Si3N44

J.C. Idrobo, M.P. Oxley, W. Walkosz, R. F. Klie, S. Ög?üt, B. Mikijelj, S.J. Pennycook, and
S.T. Pantelides

Appl. Phys. Lett. 95, 164101 (2009)


Colossal Ionic Conductivity in Epitaxial ZrO2:Y2O3 /SrTiO3 Heterostructures

J. Garcia-Barriocanal, A. Rivera-Calzada, M. Varela, Z. Sefrioui, E. Iborra, C. Leon, S.J. Pennycook, J. Santamaria

Science 321, 676 (2008)


Imaging of Individual Point Defects Inside Silicon Nanowires

S.H. Oh, K. van Benthem, S.I. Molina, A.Y. Borisevich, W. Luo, P. Werner, N.D. Zakharov, D. Kumar, S.T. Pantelides, S.J. Pennycook

Nano Lett. 8, 1016 (2008)


The origin of ferromagnetism in insulating CoxTi1-xO2 anatase thin films

K.G. Roberts, M. Varela, S. Rashkeev, S.T. Pantelides, S.J. Pennycook, K.M. Krishnan

Phys. Rev. B 78, 014409 (2008)


Direct imaging of quantum wires nucleated at diatomic steps

S.I. Molina, M. Varela, D.L. Sales, T. Ben, J. Pizarro, P.L. Galindo, D. Fuster, Y. González, L. González and S.J. Pennycook

Appl. Phys. Lett. 91, 143112 (2007)


Role of the nanoscale in catalytic CO oxidation by supported Au and Pt nanostructures

S.N. Rashkeev, A. R. Lupini, S.H. Overbury, S.J. Pennycook, and S.T. Pantelides

Phys. Rev. B, 76, 035438 (2007)


Structural basis for near unity quantum yield core/shell nanostructures

J. McBride, J. Treadway, L.C. Feldman, S.J. Pennycook, and S.J. Rosenthal

Nano Lett. 6, 1496–1501 (2006)


Higher current superconductors: why Ca-doped grain boundaries improve critical current

R.F. Klie, J.P. Buban, M. Varela,
A. Franceschetti, C. Jooss, Y. Zhu
S.T. Pantelides, S.J. Pennycook

Nature, 435, 475 (2005)


Three-dimensional imaging of individual hafnium atoms inside a semiconductor device

van Benthem, K., A. R. Lupini, M. Kim, H. S. Baik, S. Doh, J. H. Lee, M. P. Oxley, S. D. Findlay, L. J. Allen, J. T. Luck and S. J. Pennycook

Appl. Phys. Lett., 87, Art. No. 034104 (2005)


Direct Sub-Angstrom imaging of a crystal lattice

P.D. Nellist et al.

Science 305, 1741 (2004)


Dopants Adsorbed as Single Atoms Prevent Degradation of Catalysts

Dopants Adsorbed as Single Atoms Prevent Degradation of Catalysts

A.Y. Borisevich

Nature Materials 3, 143 (2004)



Observation of Rare-Earth Segregation in Silicon itride Ceramics at Subnanometre Dimensions

Observation of Rare-Earth Segregation in Silicon Nitride Ceramics at Subnanometre Dimensions

N. Shibata et al.

Nature 428, 730 (2004).



Single Atom Spectroscopy

Single Atom Spectroscopy

M. Varela et al.

Physical Review Letters 92, 095502 (2004)


Direct Atomic-Scale Observation of a Local Thermal Vibration Anomaly in a Quasicrystalline Al72Ni20Co8 Compound

Direct Atomic-Scale Observation of a Local Thermal Vibration Anomaly in a Quasicrystalline Al72Ni20Co8 Compound

E. Abe et al.

Nature 421, 347 (2003)



Nucleation Mechanism for Single Wall Carbon Nanotubes

Nucleation Mechanism for Single Wall Carbon Nanotubes

X. Fan et al.

Phys. Rev. Lett. 90, 145501 (2003)



 Oak Ridge National Laboratory