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Search Publications by: Renu Sharma (Assoc)

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Displaying 76 - 100 of 101

Metastable Crystalline AuGe Catalysts Formed During Isothermal Germanium Nanowire Growth

June 19, 2012
Author(s)
Andrew D. Gamalski, Jerry Tersoff, Renu Sharma, Caterina Ducati, Stephan Hofmann
We observe the formation of metastable AuGe phases without quenching, during strictly isothermal nucleation and growth of Ge nanowires, using video-rate lattice-resolved environmental transmission electron microscopy. We explain the unexpected formation of

Direct observation of nucleation and early stages of growth of GaN nanowires

February 15, 2012
Author(s)
Rosa E. Diaz, Renu Sharma, Karalee Jarvis, Qinglei Zhang, Subhash Mahajan
We report for the first time direct observations of the nucleation and early stages of growth of GaN nanowires. The nanowires were formed by exposing Au + Ga droplets to ammonia. The formation process was observed in situ, and controlled in real time using

Direct Observation of Hydrogen Spillover in Ni-Loaded Pr-Doped Ceria

January 17, 2012
Author(s)
Vaneet Sharma, Peter A. Crozier, Renu Sharma, James B. Adams
Hydrogen-spillover in Ni-loaded Pr-doped ceria (PDC) was directly observed using an environmental transmission electron microscope (ETEM). Localized reduction of ceria in a H2 atmosphere was observed and attributed to gas-Ni-ceria interactions at the three

Carbon Nanotube Nucleation Driven by Catalyst Morphology Dynamics

November 14, 2011
Author(s)
Elena Pigos, Evgeni S. Penev, Morgana A. Ribas, Renu Sharma, Boris I. Yakobson, Avetik R. Harutyunyan
In situ observation of carbon nanotube nucleation process accompanied by catalyst particle dynamic morphology reconstruction is considered within a thermodynamic approach, and reveals the driving force for the liftoff—a crucial event in the nanotube growth

In Search of Enhanced Electrolyte Materials: A Case Study of Doubly Doped Ceria

October 28, 2011
Author(s)
Pratik Dholabhai, James B. Adams, Peter A. Crozier, Renu Sharma
Various compositions of gadolinium-praseodymium doubly doped ceria (GPDC) have been studied to appreciate the effect of two co-dopants in enhancing the ionic conductivity. A Kinetic Lattice Monte Carlo (KLMC) model of vacancy diffusion in GPDC has been

First-principles Study of Defect Migration in RE-doped Ceria (RE = Pr, Gd)

February 2, 2011
Author(s)
Pratik Dholabhai, James B. Adams, Peter A. Crozier, Renu Sharma
Oxygen vacancy formation and migration in ceria (CeO2) is central to its performance as an ionic conductor. Ceria doped with suitable aliovalent dopants has enhanced oxygen ion conductivity - higher than that of yttria stabilized zirconia (YSZ), the most

Electron Beam Induced Growth of TiO2 Nanostructures

February 1, 2011
Author(s)
Renu Sharma
We report the evolution of TiO2 nanostructures when Au nanoparticles, supported on single crystal TiO2 substrates, were heated in ~2 Torr of flowing O2 in an environmental transmission electron microscope. Nanostructures with different morphologies were