Browsing by Author "Zhang, Hongzhou"
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Bacterially synthesized tellurium nanostructures for broadband ultrafast nonlinear optical applications
Blau, Werner; Zhang, Hongzhou (2019)Elementary tellurium is currently of great interest as an element with potential promise in nano-technology applications because of the recent discovery regarding its three two-dimensional phases and the existence of Weyl ... -
A comparison of He and Ne FIB imaging of cracks in microindented silicon nitride
Zhang, Hongzhou (2018)Helium ion microscopy (HIM) offers potential as a high spatial resolution technique for imaging insulating samples that are susceptible to charging artifacts. In this study helium and neon ion microscopy are used to image ... -
Defect sizing, separation, and substrate effects in ion-irradiated monolayer two-dimensional materials
Duesberg, Georg; Mc Evoy, Niall; Zhang, Hongzhou (2018) -
Defect-moderated oxidative etching of MoS<inf>2</inf>
Zhang, Hongzhou (2019)We report a simple technique for the selective etching of bilayer and monolayer MoS 2. In this work, chosen regions of MoS 2 were activated for oxygen adsorption and reaction by the application of low doses of He + at 30 ... -
Elemental preference and atomic scale site recognition in a Co-Al-W-base superalloy
Zhang, Hongzhou; Maguire, Pierce (2017) -
Enhancing capacitance behaviour of CoOOH nanostructures using transition metal dopants by ambient oxidation
Zhang, Hongzhou; Schmitt, Wolfgang; Maguire, Pierce (2016)Cobalt hydrate and doped binary Co0.9M0.1OOH (M = Ni, Mn, Fe) nanorings of 100-300 nm were fabricated in solution through a facile ambient oxidation method. A transformation from Co0.9Ni0.1(OH)2 nanodiscs to hollow ... -
Helium ion microscope generated nitrogen-vacancy centres in type Ib diamond
Zhang, Hongzhou; Mc Closkey, David; Duesberg, Georg; Donegan, John; Mc Evoy, Niall; Cross, Graham (2014)We report on position and density control of nitrogen-vacancy (NV) centres created in type Ib diamond using localised exposure from a helium ion microscope and subsequent annealing. Spatial control to <380 nm has been ... -
Helium ion microscope generated nitrogen-vacancy centres in type Ib diamond
Donegan, John; Cross, Graham; Zhang, Hongzhou; Mc Closkey, David (2014)We report on position and density control of nitrogen-vacancy (NV) centres created in type Ib diamond using localised exposure from a helium ion microscope and subsequent annealing. Spatial control to <380 nm has been ... -
Helium ion microscopy of graphene: Beam damage, image quality and edge contrast
Zhang, Hongzhou; Coleman, Jonathan; Donegan, John (2013)A study to analyse beam damage, image quality and edge contrast in the helium ion microscope (HIM) has been undertaken. The sample investigated was graphene. Raman spectroscopy was used to quantify the disorder that can ... -
Investigation of coupled cobalt-silver nanoparticle system by plan view TEM
Shvets, Igor; Zhang, Hongzhou (2012) -
Ni(OH)2@Co(OH)2 hollow nanohexagons: Controllable synthesis, facet-selected competitive growth and capacitance property
Zhang, Hongzhou (2014)Hollow nanohexagons with a core?shell structure have been synthesized from a mixture of Ni and Co hydroxide by a mild wet chemical approach. Ni(OH)2@Co(OH)2 nanohexagons with controllable sizes of about 200 nm, morphology ... -
Oxide-mediated recovery of field-effect mobility in plasma-treated MoS<inf>2</inf>
Nicolosi, Valeria; Mc Guinness, Cormac; Zhang, Hongzhou; Bradley, Louise (2018)Precise tunability of electronic properties of two-dimensional (2D) nanomaterials is a key goal of current research in this field of materials science. Chemical modification of layered transition metal dichalcogenides leads ... -
Oxide-mediated self-limiting recovery of field effect mobility in plasma-treated MoS2
Mc Guinness, Cormac; Zhang, Hongzhou; Ferreira, Mauro; Bradley, Louise; Boland, John; Nicolosi, Valeria (2018) -
Photoresponsivity enhancement in monolayer MoS<inf>2</inf> by rapid O<inf>2</inf>:Ar plasma treatment
Zhang, Hongzhou; Lunney, James (2019)We report up to ten-fold enhancement of the photoresponsivity of monolayer molybdenum disulfide (MoS2) by treatment with O2:Ar (1:3) plasma. We characterize the surface of plasma-exposed MoS2 by TEM, Raman, and PL mapping ... -
The Role of Mucin in the Toxicological Impact of Polystyrene Nanoparticles
Tajber, Lidia; Santos-Martinez, Maria; Inkielewicz-Stepniak, Iwona; Behan, Gavin; Zhang, Hongzhou; Radomski, Marek W.; Medina, Carla (2018)The development of novel oral drug delivery systems is an expanding area of research and both new approaches for improving their efficacy and the investigation of their potential toxicological effect are crucial and should ... -
The role of mucin in the toxicological impact of polystyrene nanoparticles
Medina Martin, Carlos; Zhang, Hongzhou; Tajber, Lidia (2018) -
Suppression of the Shear Raman Mode in Defective Bilayer MoS2
Nicolosi, Valeria; Mc Evoy, Niall; Zhang, Hongzhou (2019)We investigate the effects of lattice disorders on the low frequency Raman spectra of bilayer MoS 2. The bilayer MoS 2 was subjected to defect engineering by irradiation with a 30 keV He + ion beam, and the induced morphology ... -
Synthesis, characterization and magnetic properties of ultrafine Co<inf>3</inf>O<inf>4</inf> octahedra
Zhang, Hongzhou; Coey, John; Schmitt, Wolfgang; Venkatesan, Munuswamy (2015)Octahedral Co3O4 nanoparticles were synthesised in an aqueous ammonia solution using hexagonal β-Co(OH)2 nanoplates as starting materials. Electron microscopy analysis indicates that the Co3O4 particles have diameters of ...