Nanoparticle

M A TE RI A L S CH A RACT ER IZ A TI O N 62 ( 20 1 1 ) 6 3 5 6 4 1 available at www.sciencedirect.com www.elsevier.com/ post/matchar Chemical changes in coulomb Nanotube-Nickel/Nickel Oxide philia/ pinpoint nanoparticle heterostructures treated at high temperatures Nitin Chopraa,?, Hylton G. McWhinney b , Wenwu Shi a a Metallurgical and Materials Engineering, decoct for Materials for Information Technology (MINT), Box 870202, The University of Alabama, Tuscaloosa, AL 35487 ground forces b Prairie View A&M University, TX 77446 USA AR TIC LE D ATA Article history: have 25 January 2011 Received in revised form 10 April 2011 Accepted 15 April 2011 Keywords: Core/shell nanoparticles Carbon carbon nanotubes Heterostructures XPS Electron microscopy ABSTR ACT Heterostructures composed of carbon nanotube (CNT) coat with Ni/NiO core/shell nanoparticles (denoted as CNC heterostructures) were synthesized in a wet-chemistry and single-step synthesis route involving di rect nucleation of nanoparticles on CNT surface. two unalike aspects of CNC heterostructures were studied here. First, it was observed that the nanoparticle coatings were more uniform on the as-produced and non-purified CNTs compared to purified (or bitter treated) CNTs. These heterostructures were characterized using electron microscopy, Raman spectroscopy, and energy dispersive spectroscopy. Second, caloric constancy of CNC heterostructures was studied by harden them in N2-rich (O2-lean) purlieu amongst one hundred twenty-five and 750 °C for 1 h. A flesh out roentgen ray photoelectron spectroscopy and Raman spectroscopy analysis was performed to evaluate the effectuate of annealing temperatures on chemical composition, phases, and stability of the heterostructures. It was observed that the CNTs show in the heterostructures completely decomposed and core Ni nanoparticle oxidized significantly between 600 and 750 °C. © 2011 Elsevier Inc. All rights reserved. 1. Introduction Owing to their high surfac! e-to-volume ratio and...If you esteem to get a full essay, order it on our website: OrderCustomPaper.com

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