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  • 1
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    Size-dependent evolution of the atomic vibrational density of states and thermodynamic properties of isolated Fe nanoparticles (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-10-03
    Description: Author(s): B. Roldan Cuenya, L. K. Ono, J. R. Croy, K. Paredis, A. Kara, H. Heinrich, J. Zhao, E. E. Alp, A. T. DelaRiva, A. Datye, E. A. Stach, and W. Keune We have gained insight into the internal degree of atomic disorder in isolated size-selected Fe nanoparticles (NPs) (∼2–6 nm in size) supported on SiO 2 /Si(111) and Al 2 O 3 (0001) from precise measurements of the low-energy (low- E ) part of the phonon density of states [PDOS, g ( E )] via 57 Fe nuclear reson... [Phys. Rev. B 86, 165406] Published Tue Oct 02, 2012
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Periodically Changing Morphology of the Growth Interface in Si, Ge, and GaP Nanowires (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-07-07
    Description: Author(s): C.-Y. Wen, J. Tersoff, K. Hillerich, M. C. Reuter, J. H. Park, S. Kodambaka, E. A. Stach, and F. M. Ross Nanowire growth in the standard ⟨111⟩ direction is assumed to occur at a planar catalyst-nanowire interface, but recent reports contradict this picture. Here we show that a nonplanar growth interface is, in fact, a general phenomenon. Both III–V and group IV nanowires show a distinct region at the t... [Phys. Rev. Lett. 107, 025503] Published Wed Jul 06, 2011
    Keywords: Condensed Matter: Structure, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Kinetics of Congruent Vaporization of ZnO Islands (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-09-29
    Description: Author(s): B. J. Kim, R. E. García, and E. A. Stach We examine the congruent vaporization of ZnO islands using in situ transmission electron microscopy. Correlating quantitative measurements with a theoretical model offers a comprehensive understanding of the equilibrium conditions of the system, including equilibrium vapor pressure and surface free ... [Phys. Rev. Lett. 107, 146101] Published Wed Sep 28, 2011
    Keywords: Condensed Matter: Structure, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Kinetics of individual nucleation events observed in nanoscale vapor-liquid-solid growth (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-11-15
    Description: We measured the nucleation and growth kinetics of solid silicon (Si) from liquid gold-silicon (AuSi) catalyst particles as the Si supersaturation increased, which is the first step of the vapor-liquid-solid growth of nanowires. Quantitative measurements agree well with a kinetic model, providing a unified picture of the growth process. Nucleation is heterogeneous, occurring consistently at the edge of the AuSi droplet, yet it is intrinsic and highly reproducible. We studied the critical supersaturation required for nucleation and found no observable size effects, even for systems down to 12 nanometers in diameter. For applications in nanoscale technology, the reproducibility is essential, heterogeneity promises greater control of nucleation, and the absence of strong size effects simplifies process design.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, B J -- Tersoff, J -- Kodambaka, S -- Reuter, M C -- Stach, E A -- Ross, F M -- New York, N.Y. -- Science. 2008 Nov 14;322(5904):1070-3. doi: 10.1126/science.1163494.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Materials Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19008438" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Control of metal nanocrystal size reveals metal-support interface role for ceria catalysts (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-07-23
    Description: Interactions between ceria (CeO2) and supported metals greatly enhance rates for a number of important reactions. However, direct relationships between structure and function in these catalysts have been difficult to extract because the samples studied either were heterogeneous or were model systems dissimilar to working catalysts. We report rate measurements on samples in which the length of the ceria-metal interface was tailored by the use of monodisperse nickel, palladium, and platinum nanocrystals. We found that carbon monoxide oxidation in ceria-based catalysts is greatly enhanced at the ceria-metal interface sites for a range of group VIII metal catalysts, clarifying the pivotal role played by the support.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cargnello, Matteo -- Doan-Nguyen, Vicky V T -- Gordon, Thomas R -- Diaz, Rosa E -- Stach, Eric A -- Gorte, Raymond J -- Fornasiero, Paolo -- Murray, Christopher B -- New York, N.Y. -- Science. 2013 Aug 16;341(6147):771-3. doi: 10.1126/science.1240148. Epub 2013 Jul 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemical and Pharmaceutical Sciences, ICCOM-CNR, Consortium INSTM, University of Trieste, Trieste, Italy.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23868919" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Grain boundary-mediated plasticity in nanocrystalline nickel (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-08-03
    Description: The plastic behavior of crystalline materials is mainly controlled by the nucleation and motion of lattice dislocations. We report in situ dynamic transmission electron microscope observations of nanocrystalline nickel films with an average grain size of about 10 nanometers, which show that grain boundary-mediated processes have become a prominent deformation mode. Additionally, trapped lattice dislocations are observed in individual grains following deformation. This change in the deformation mode arises from the grain size-dependent competition between the deformation controlled by nucleation and motion of dislocations and the deformation controlled by diffusion-assisted grain boundary processes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shan, Zhiwei -- Stach, E A -- Wiezorek, J M K -- Knapp, J A -- Follstaedt, D M -- Mao, S X -- New York, N.Y. -- Science. 2004 Jul 30;305(5684):654-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Mechanical Engineering, University of Pittsburgh, 648 Benedum Hall, Pittsburgh, PA 15261, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15286368" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Preferential growth of single-walled carbon nanotubes with metallic conductivity (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-10-03
    Description: Single-walled carbon nanotubes can be classified as either metallic or semiconducting, depending on their conductivity, which is determined by their chirality. Existing synthesis methods cannot controllably grow nanotubes with a specific type of conductivity. By varying the noble gas ambient during thermal annealing of the catalyst, and in combination with oxidative and reductive species, we altered the fraction of tubes with metallic conductivity from one-third of the population to a maximum of 91%. In situ transmission electron microscopy studies reveal that this variation leads to differences in both morphology and coarsening behavior of the nanoparticles that we used to nucleate nanotubes. These catalyst rearrangements demonstrate that there are correlations between catalyst morphology and resulting nanotube electronic structure and indicate that chiral-selective growth may be possible.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harutyunyan, Avetik R -- Chen, Gugang -- Paronyan, Tereza M -- Pigos, Elena M -- Kuznetsov, Oleg A -- Hewaparakrama, Kapila -- Kim, Seung Min -- Zakharov, Dmitri -- Stach, Eric A -- Sumanasekera, Gamini U -- New York, N.Y. -- Science. 2009 Oct 2;326(5949):116-20. doi: 10.1126/science.1177599.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Honda Research Institute USA, 1381 Kinnear Road, Columbus, OH 43212, USA. aharutyunyan@honda-ri.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19797656" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Formation of compositionally abrupt axial heterojunctions in silicon-germanium nanowires (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-12-08
    Description: We have formed compositionally abrupt interfaces in silicon-germanium (Si-Ge) and Si-SiGe heterostructure nanowires by using solid aluminum-gold alloy catalyst particles rather than the conventional liquid semiconductor-metal eutectic droplets. We demonstrated single interfaces that are defect-free and close to atomically abrupt, as well as quantum dots (i.e., Ge layers tens of atomic planes thick) embedded within Si wires. Real-time imaging of growth kinetics reveals that a low solubility of Si and Ge in the solid particle accounts for the interfacial abruptness. Solid catalysts that can form functional group IV nanowire-based structures may yield an extended range of electronic applications.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wen, C-Y -- Reuter, M C -- Bruley, J -- Tersoff, J -- Kodambaka, S -- Stach, E A -- Ross, F M -- New York, N.Y. -- Science. 2009 Nov 27;326(5957):1247-50. doi: 10.1126/science.1178606.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Materials Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19965471" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Carbon-based supercapacitors produced by activation of graphene (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-05-14
    Description: Supercapacitors, also called ultracapacitors or electrochemical capacitors, store electrical charge on high-surface-area conducting materials. Their widespread use is limited by their low energy storage density and relatively high effective series resistance. Using chemical activation of exfoliated graphite oxide, we synthesized a porous carbon with a Brunauer-Emmett-Teller surface area of up to 3100 square meters per gram, a high electrical conductivity, and a low oxygen and hydrogen content. This sp(2)-bonded carbon has a continuous three-dimensional network of highly curved, atom-thick walls that form primarily 0.6- to 5-nanometer-width pores. Two-electrode supercapacitor cells constructed with this carbon yielded high values of gravimetric capacitance and energy density with organic and ionic liquid electrolytes. The processes used to make this carbon are readily scalable to industrial levels.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhu, Yanwu -- Murali, Shanthi -- Stoller, Meryl D -- Ganesh, K J -- Cai, Weiwei -- Ferreira, Paulo J -- Pirkle, Adam -- Wallace, Robert M -- Cychosz, Katie A -- Thommes, Matthias -- Su, Dong -- Stach, Eric A -- Ruoff, Rodney S -- New York, N.Y. -- Science. 2011 Jun 24;332(6037):1537-41. doi: 10.1126/science.1200770. Epub 2011 May 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Mechanical Engineering, University of Texas at Austin, Austin, TX 78712, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21566159" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Synthesis of nanostructures in nanowires using sequential catalyst reactions (2015)
    Springer Nature
    Details
    Publication Date: 2015-07-24
    Description: Nature Materials 14, 820 (2015). doi:10.1038/nmat4352 Authors: F. Panciera, Y.-C. Chou, M. C. Reuter, D. Zakharov, E. A. Stach, S. Hofmann & F. M. Ross
    Print ISSN: 1476-1122
    Electronic ISSN: 1476-4660
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Natural Sciences in General , Physics
    Published by Springer Nature
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