Correlated Transitions of Pb/PbO Core-Shell Nanoparticles Induced by Electron Beam Irradiation

2013 ◽  
Vol 643 ◽  
pp. 199-202
Author(s):  
Yang Zhou ◽  
Long Bing He ◽  
Min Han ◽  
Bo Xie
Keyword(s):  
Electron Beam ◽  
Moderate Intensity ◽  
Oxide Shell ◽  
Core Shell ◽  
Inelastic Electron ◽  
Shell Nanoparticles ◽  
Electron Collisions ◽  
Intense Electron Beam ◽  
Amorphous Particles ◽  
Core Shell Nanoparticles

Nanoscale thermodynamics and kinetics were explored via the manipulation of Pb/PbO core-shell nanoparticles with a focused electron beam which served as a nanometer heating probe. In the electron transmission microscope (TEM), when an electron beam of moderate intensity was used to irradiate the nanoparticles, the amorphous particles gradually crystallized and showed distinct boundaries between lead cores and oxide shells. In such a way, the oxide shell could be easily measured to be 0.5-2 nanometers. With a high intensity electron beam, melting of the lead cores could be observed, indicating a sufficient local temperature increasing induced by the concentrated heat generated by inelastic electron collisions. The fluidic metal core erupted out through the cracked shells accompanied with the vanish of the boundaries between the cores and shells. Manipulations on nanoparticle decorated carbon wires proved that the lead oxide shells could sustain the irradiation of intense electron beam.

Natural Polyampholyte-Based Core−Shell Nanoparticles withN-Carboxyethylchitosan-Containing Core and Poly(ethylene oxide) Shell

2009 ◽  
Vol 10 (4) ◽  
pp. 838-844 ◽  
Author(s):  
Rosica Mincheva ◽  
François Bougard ◽  
Dilyana Paneva ◽  
Magali Vachaudez ◽  
Nevena Manolova ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Oxide Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Core Shell Nanoparticles

Characterization of a Porous Carbon Material Functionalized with Cobalt-Oxide/Cobalt Core-Shell Nanoparticles for Lithium Ion Battery Electrodes

MRS Advances ◽  
2016 ◽  
Vol 1 (15) ◽  
pp. 1061-1066
Author(s):  
Dalaver H. Anjum ◽  
Shahid Rasul ◽  
Manuel A. Roldan-Gutierrez ◽  
Pedro M. F. J. Costa
Keyword(s):  
Lithium Ion Battery ◽  
Cobalt Oxide ◽  
Lithium Ion ◽  
Oxide Shell ◽  
Porous Carbon Material ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Transmission Electron ◽  
Core Shell Nanoparticles ◽  
Type Lattice

ABSTRACTA nanoporous carbon (C) material, functionalized with Cobalt-Oxide/Cobalt (CoO/Co) core-shell nanoparticles (NPs), was structurally and chemically characterized with transmission electron microcopy (TEM) while its electrochemical response for Lithium ion battery (LIB) applications was evaluated as well. The results herein show that the nanoporous C material was uniformly functionalized with the CoO/Co core-shell NPs. Further the NPs were crystalline with fcc-type lattice on the Co2+ oxide shell and hcp-type core of metallic Co0. The electrochemical study was carried out by using galvanostatic charge/discharge cycling at a current density of 1000 mA g−1. The potential of this hybrid material for LIB applications was confirmed and it is attributed to the successful dispersion of the Co2+/ Co0 NPs in the C support.

How hollow structures form from crystalline iron–iron oxide core–shell nanoparticles in the electron beam

2013 ◽  
Vol 49 (55) ◽  
pp. 6203 ◽  
Author(s):  
David A. J. Herman ◽  
Soshan Cheong ◽  
Moritz J. Banholzer ◽  
Richard D. Tilley
Keyword(s):  
Electron Beam ◽  
Iron Oxide ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Hollow Structures ◽  
Iron Iron ◽  
Iron Oxide Core ◽  
Core Shell Nanoparticles

Iron Oxide Composite Nanoparticles and Sensing Properties

2005 ◽  
Vol 900 ◽  
Author(s):  
Lingyan Wang ◽  
Xiajing Shi ◽  
Sakienah Mahs ◽  
Jeongku Choi ◽  
Karan Sarup ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Oxide Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Fe Oxide ◽  
Sensing Properties ◽  
Volatile Organic ◽  
Unique Aspect ◽  
Core Shell Nanoparticles ◽  
Piezoelectric Devices

ABSTRACTThis paper reports findings of an investigation of the synthesis of monolayer-capped iron oxide and core (iron oxide)-shell (gold) nanocomposite and their assembly towards thin films as sensing materials. Pre-synthesized and size-defined iron oxide nanoparticles were used as seeding materials for the reduction of gold precursors, which was shown to be effective for coating the iron oxide cores with gold shells (Fe oxide@Au). The unique aspect of our synthesis is the formation of Fe oxide@Au core-shell nanoparticles with controllable surface properties. By controlling the reaction temperatures and manipulating the capping agent properties and solution compositions, the size, shape, composition, and monodispersity can be tailored. The core-shell nanoparticles were shown to form molecularly-mediated thin film assemblies using molecular mediators. The sensing properties of the nanostructures on piezoelectric devices were examined for the detection of volatile organic compounds. The preliminary results have provided important insights into the design of core-shell nanocomposites as sensing materials.

scholarly journals Adsorption of HCN onto Copper@Copper-Oxide Core–Shell Nanoparticle Systems

2009 ◽  
Vol 27 (4) ◽  
pp. 349-361
Author(s):  
Septimus H. Liang ◽  
Shiliang Wang ◽  
David B. Pedersen
Keyword(s):  
Reaction Mechanism ◽  
Copper Oxide ◽  
Oxide Shell ◽  
Core Shell ◽  
Copper Nanoparticle ◽  
Filter Media ◽  
Shell Nanoparticles ◽  
Copper Compounds ◽  
Core Shell Nanoparticles ◽  
Carbon Based

Copper compounds are widely used as impregnants that enhance the removal of HCN by carbon-based filter media. The reaction mechanism involved is poorly understood. In this study, we have followed the reaction of HCN with pristine copper, copper oxide (CuO and Cu2O) and copper@copperoxide (Cu@Cu2O) core–shell nanoparticles of well-defined size and composition. We have established a cooperative reaction mechanism where both the copper oxide shell and copper core are required for the chemisorption of HCN onto copper nanoparticle impregnants. The suitability of copper@copperoxide nanoparticles as impregnants for the removal of HCN in respirator canisters is discussed.

scholarly journals Structure and mechanism of the formation of core–shell nanoparticles obtained through a one-step gas-phase synthesis by electron beam evaporation

2015 ◽  
Vol 6 ◽  
pp. 874-880 ◽  
Author(s):  
Andrey V Nomoev ◽  
Sergey P Bardakhanov ◽  
Makoto Schreiber ◽  
Dashima G Bazarova ◽  
Nikolai A Romanov ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Evaporation ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Factors Affecting ◽  
Vapour Concentration ◽  
Si Nanoparticles ◽  
Mechanisms Of Formation ◽  
One Step ◽  
Core Shell Nanoparticles

The structure of core–shell Cu@silica and Ag@Si nanoparticles obtained in one-step through evaporation of elemental precursors by a high-powered electron beam are investigated. The structure of the core and shell of the particles are investigated in order to elucidate their mechanisms of formation and factors affecting the synthesis. It is proposed that the formation of Cu@silica particles is mainly driven by surface tension differences between Cu and Si while the formation of Ag@Si particles is mainly driven by differences in the vapour concentration of the two components.

scholarly journals On the synthesis of bi-magnetic manganese ferrite-based core–shell nanoparticles

2021 ◽  
Author(s):  
Marco Sanna Angotzi ◽  
Valentina Mameli ◽  
Claudio Cara ◽  
Davide Peddis ◽  
Huolin L. Xin ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Cobalt Ferrite ◽  
Magnetic Core ◽  
Oxide Shell ◽  
Core Shell ◽  
Manganese Ferrite ◽  
Shell Nanoparticles ◽  
Seed Mediated ◽  
Core Shell Nanoparticles

Dissolution phenomena in seed-mediated growth approaches of MnFe2O4-based bi-magnetic core–shell nanoheterostructures with a cobalt ferrite or spinel iron oxide shell.

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