Browsing Physics (Scholarly Publications) by Author "ZHANG, HONGZHOU"
Now showing items 1-18 of 18
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Bimetallic molybdenum tungsten oxynitride: Structure and electrochemical properties
ZHANG, HONGZHOU (2013)Mesoporous molybdenum tungsten oxynitride was synthesised by the temperature-programmed reduction of the bimetallic oxide precursor in ammonia and its electrochemical properties were investigated in 1 M H2SO4 aqueous ... -
Equilibrium faceting formation in vicinal Al2O3 (0001) surface caused by annealing
FOX, DANIEL; SHVETS, IGOR; FLEISCHER, KARSTEN; ZHANG, HONGZHOU; USOV, VICTOR; VERRE, RUGGERO; SOFIN, SUMESH; BEHAN, G. (Elsevier B.V., 2012-07)We report on a heat-induced transformation of the surface of ?-alumina (0001) crystals which have an off-cut in the [1-210] direction. Annealing the crystal causes the surface to transform into a regular array of (0001) ... -
Evolution of resistive switching over bias duration of single Ag2S nanowires
ZHANG, HONGZHOU (2010)We report experimental results of ultralow frequency photocurrent oscillation in individual ZnO nanowires. Consecutive photocurrent and photoluminescence measurements corroborate the process of capture and release of ... -
General approach to the analysis of plasmonic structures using spectroscopic ellipsometry
FOX, DANIEL; FLEISCHER, KARSTEN; SMITH, CHRISTOPHER; ZHANG, HONGZHOU; MCGILP, JOHN; SHVETS, IGOR (2013)In this article a route to analyze the full optical response of plasmonic structures is developed. First, the simple case of an anisotropic thin plasmonic layer supported on a transparent substrate is analyzed by ... -
Growth and characterization of epitaxial Ti3GeC2 thin films on 4 H-SiC(0 0 0 1)
ZHANG, HONGZHOU (2012)Epitaxial Ti3GeC2 thin films were deposited on 4? off-cut 4 H-SiC(0 0 0 1) using magnetron sputtering from high purity Ti, C, and Ge targets. Scanning electron microscopy and helium ion microscopy show that the Ti3GeC2 ... -
High throughput secondary electron imaging of organic residues on a graphene surface.
ZHANG, HONGZHOU; ZHOU, YANGBO (2014)Surface organic residues inhibit the extraordinary electronic properties of graphene, hindering the development of graphene electronics. However, fundamental understanding of the residue morphology is still absent due to ... -
Hysteresis Magnetoresistance and Micromagnetic Modeling of Ni Microbelts
ZHANG, HONGZHOU (2010)Magnetization reversal process in a single nickel microbelt is investigated by measuring magnetoresistance (MR). A hysteresis MR curve is observed, which consists of a reversible bell-shaped curve under high magnetic field ... -
Large-scale mechanical peeling of boron nitride nanosheets by low-energy ball milling
ZHANG, HONGZHOU (2011)Mechanical cleavage by Scotch tape was the first method to produce graphene and is still widely used in laboratories. However, a critical problem of this method is the extremely low yield. We have tailored ball milling ... -
MoO3 nanoparticles dispersed uniformly in carbon matrix: a high capacity composite anode for Li-ion batteries
ZHANG, HONGZHOU (2011)A MoO3?carbon nanocomposite was synthesized from a mixture of MoO3 and graphite by a controlled ball milling procedure. The as-prepared product consists of nanosized MoO3 particles (2?180 nm) homogeneously distributed in ... -
Nano Au-decorated boron nitride nanotubes: Conductance modification and field-emission enhancement
ZHANG, HONGZHOU (2008)This letter reports the electrical and field-emissionproperties of Au-decorated boron nitride nanotubes (Au-BNNTs). The insulating BNNTs become metallic after Au coating as the Au coverage exceeds a critical value. The Au ... -
Nitrogen assisted etching of graphene layers in a scanning electron microscope
COLEMAN, JONATHAN; FOX, DANIEL; O'NEILL, ARLENE; ZHOU, DAN; ZHANG, HONGZHOU (2011)We describe the controlled patterning of nanopores in graphene layers by using the low-energy (<10?keV) focused electron beam in a scanning electron microscope. Regular nanometer-sized holes can be fabricated with the ... -
Photoluminescence study of basal plane stacking faults in ZnO nanowires
ZHANG, HONGZHOU (2014)We have investigated the photoluminescence (PL) of ZnO nanowires (NWs) containing a high density ($1 106 cm 1) of basal plane stacking faults (BSFs). It was observed that the BSFs result in a specific PL peak at $3.329 eV ... -
Porous TiO2 with a controllable bimodal pore size distribution from natural ilmenite
ZHANG, HONGZHOU (2011)Ilmenite (FeTiO3) is an inexpensive abundant natural mineral and it would be a perfect precursor for the production of porous TiO2 if a suitable synthesis method was developed. A new method combining a series of processing ... -
Spin-dependent transport properties of Fe3O4/MoS2/Fe3O4 junctions.
SHVETS, IGOR; ZHANG, HONGZHOU; DUESBERG, GEORG; GATENSBY, RILEY (2015)Magnetite is a half-metal with a high Curie temperature of 858 K, making it a promising candidate for magnetic tunnel junctions (MTJs). Yet, initial efforts to exploit its half metallic nature in Fe3O4/MgO/Fe3O4 MTJ ... -
Supramolecular approaches to metal-organic gels using 'Chevrel-type' coordination clusters as building units
ZHANG, HONGZHOU (2013)A novel hexanuclear {Mn6} coordination complex with octahedral topology has been prepared and was subsequently used as a building unit for the construction of coordination polymers and metal?organic gels; the latter exhibit ... -
Ultralow-frequency photocurrent oscillation in ZnO nanowires
ZHANG, HONGZHOU (2010)We report experimental results of ultralow frequency photocurrent oscillation in individual ZnO nanowires. Consecutive photocurrent and photoluminescence measurements corroborate the process of capture and release of ... -
Ultrathin magnetite in Fe3O4/MgO superlattices: Investigating the enhanced thin film magnetic moment
FLEISCHER, KARSTEN; ZHANG, HONGZHOU; MAUIT, OZHET; FOX, DANIEL; SMITH, CHRISTOPHER; SHVETS, IGOR; MULLARKEY, DARAGH (2017) -
Unveiling the dynamic capacitive storage mechanism of Co3O4 @NiCo2O4 hybrid nanoelectrodes for supercapacitor applications
ZHANG, HONGZHOU (2014)We report a simple and cost-effective approach to the synthesis of hierarchical mesporous Co3O4@NiCo2O4 nanoforests on Ni foam for supercapacitor (SC) electrode applications by a coupled one-step solution and annealing ...