All Outputs (37)

Optical properties and carrier dynamics in Co-doped ZnO nanorods (2020)
Journal Article

The controlled modification of the electronic properties of ZnO nanorods via transition metal doping is reported. A series of ZnO nanorods were synthesized by chemical bath growth with varying Co content from 0 to 20 atomic% in the growth solution. O... Read More about Optical properties and carrier dynamics in Co-doped ZnO nanorods.

Cobalt-Doped ZnO Nanorods Coated with Nanoscale Metal-Organic Framework Shells for Water-Splitting Photoanodes (2020)
Journal Article

Developing highly efficient and stable photoelectrochemical (PEC) water splitting electrodes via inexpensive, liquid phase processing is one of the key challenges for the conversion of solar energy into hydrogen for sustainable energy production. ZnO... Read More about Cobalt-Doped ZnO Nanorods Coated with Nanoscale Metal-Organic Framework Shells for Water-Splitting Photoanodes.

Controlling the growth of single crystal ZnO nanowires by tuning the atomic layer deposition parameters of the ZnO seed layer (2019)
Journal Article

Semiconducting nanowires (NWs) offer exciting prospects for a wide range of technological applications. The translation of NW science into technology requires reliable high quality large volume production. This study provides an in-depth investigatio... Read More about Controlling the growth of single crystal ZnO nanowires by tuning the atomic layer deposition parameters of the ZnO seed layer.

A simplified model to estimate thermal resistance between carbon nanotube and sample in scanning thermal microscopy (2017)
Journal Article

Scanning thermal microscopy (SThM) is an attractive technique for nanoscale thermal measurements. Multiwalled carbon nanotubes (MWCNT) can be used to enhance a SThM probe in order to drastically increase spatial resolution while keeping required ther... Read More about A simplified model to estimate thermal resistance between carbon nanotube and sample in scanning thermal microscopy.

Field imaging near to the surface of terahertz reflective optics using a vector network analyzer (2017)
Journal Article

A vector network analyzer-based quasi-optical measurement system that is suitable for mapping electric field intensity and phase near to the surface of terahertz reflective optics is presented. The system uses a fixed five parabolic mirror and transm... Read More about Field imaging near to the surface of terahertz reflective optics using a vector network analyzer.

Model for large-area monolayer coverage of polystyrene nanospheres by spin coating (2017)
Journal Article

Nanosphere lithography, an inexpensive and high throughput technique capable of producing nanostructure (below 100 nm feature size) arrays, relies on the formation of a monolayer of self-assembled nanospheres, followed by custom-etching to produce na... Read More about Model for large-area monolayer coverage of polystyrene nanospheres by spin coating.

Generation of terahertz radiation by AlGaAs nanowires (2015)
Journal Article

Terahertz emission by AlGaAs nanowires grown on a GaAs substrate under excitation by femtosecond optical pulses has been observed. It is demonstrated that THz emission occurs via excitation of photocurrent in the nanowires. The dynamics of photoinduc... Read More about Generation of terahertz radiation by AlGaAs nanowires.

Improving metal-oxide-metal (MOM) diode performance via the optimization of the oxide layer (2015)
Journal Article

Small area metal-oxide-metal (MOM) diodes are being investigated in many research groups for the detection of THz frequency radiation. In order to create a high-speed rectifying device, the central oxide layer of the MOM structure must be thin and ha... Read More about Improving metal-oxide-metal (MOM) diode performance via the optimization of the oxide layer.

A microgripper sensor device capable of detecting ion efflux from whole cells (2014)
Journal Article

Electrothermally actuated microgripper sensor devices that are capable of simultaneous manipulation of live mouse oocytes and the sensing of potassium ion efflux are presented. The ion selective electrode technology applied to a microgripper device y... Read More about A microgripper sensor device capable of detecting ion efflux from whole cells.

Modelling and Experimental Verification of Heat Dissipation Mechanisms in an SU-8 Electrothermal Microgripper (2014)
Journal Article

Within this work, a microgripper based on a hot–cold arm principle was tested to give a greater understanding of the associated heat dissipation methods. Experiments were conducted in air at atmospheric and sub-atmospheric pressure, and in helium, ar... Read More about Modelling and Experimental Verification of Heat Dissipation Mechanisms in an SU-8 Electrothermal Microgripper.

Development of Phase Shift Lithography for the Production of Metal-Oxide-Metal Diodes (2014)
Journal Article

Metal-oxide-metal (MOM) diodes have been produced by combining two novel techniques: a reactive ion etche and subsequent plasma oxidation, and a phase shift lithography process. This has resulted in a significant reduction in device feature sizes, do... Read More about Development of Phase Shift Lithography for the Production of Metal-Oxide-Metal Diodes.

Controlled reactive ion etching and plasma regrowth of titanium oxides of known thickness for production of metal-oxide-metal diodes (2013)
Journal Article

The successful production, via two different oxidation processes, of metal-oxide-metal (MOM) diodes is presented. An innovative reactive ion etching and plasma assisted regrowth process has been used to provide oxides, which are in the thickness rang... Read More about Controlled reactive ion etching and plasma regrowth of titanium oxides of known thickness for production of metal-oxide-metal diodes.

Micromachined Devices for Use in Terahertz Applications (2013)
Journal Article

Here we present results from key aspects of our interest in using micromachined devices in the THz region. First, our early work on making filters from rods of gold-coated SU8 is described. Pass (up to 97%) and stop bands can be observed which are th... Read More about Micromachined Devices for Use in Terahertz Applications.

Improved memory behaviour of single-walled carbon nanotube charge storage nodes (2012)
Journal Article

Pentacene-based metal-insulator-semiconductor memory structures utilizing single walled carbon nanotubes as a nanofloating gate (2012)
Journal Article

Manipulation of exposure dose parameters to improve production of high aspect ratio structures using SU-8 (2012)
Journal Article

The detailed consideration of the chemistry occurring during the fabrication process is very important for SU-8 compared to other photoresists. In SU-8, the solvent does far more than just act as a carrier for the photoactive compounds: it plays a pr... Read More about Manipulation of exposure dose parameters to improve production of high aspect ratio structures using SU-8.

Ti-TiOx-Pt Metal-Oxide-Metal Diodes Fabricated via a Simple Oxidation Technique (2012)
Presentation / Conference Contribution

This work presents the successful production, via a simple oxidation process, of Ti-TiOx-Pt Metal-Oxide-Metal diodes with excellent electrical asymmetry. TEM analysis has been used to verify the oxide thickness. A thicker layer produces better diodes... Read More about Ti-TiOx-Pt Metal-Oxide-Metal Diodes Fabricated via a Simple Oxidation Technique.

A versatile nanopatterning technique based on controlled undercutting and liftoff (2011)
Journal Article

Micro-machined fluidic devices for terahertz time-domain spectroscopy (2011)
Journal Article

Here we present a silicon based, micro-machined fluidic device for terahertz frequencies, fabricated using standard lithographic and micro-machining processes in a cleanroom environment. Designed for use in a conventional transmission terahertz time-... Read More about Micro-machined fluidic devices for terahertz time-domain spectroscopy.

Microelectrode arrays for electroanalytical sensing : Comparison of electroplating and electron-beam metallisation. (2011)
Journal Article

This paper demonstrates the differences in electrochemical response obtained by two distinct methods of gold microelectrode array fabrication. An array of 306 gold recessed microelectrodes (45 μm in diameter) was fabricated using lithography, metalli... Read More about Microelectrode arrays for electroanalytical sensing : Comparison of electroplating and electron-beam metallisation..