Aidan Rooney

Aidan Rooney
The University of Manchester · School of Materials

About

40
Publications
12,952
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3,154
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Introduction
Skills and Expertise

Publications

Publications (40)
Article
Twist and Bend in Van Der Waals Materials and 2D Stacked Heterostructures - Sarah Haigh, Yichao Zou, Astrid Weston, Nick Clark, Roman Gorbachev, Aidan Rooney, Robert Young, Zheling Li
Article
Full-text available
Epitaxial films may be released from growth substrates and transferred to structurally and chemically incompatible substrates, but epitaxial films of transition metal perovskite oxides have not been transferred to electroactive substrates for voltage control of their myriad functional properties. Here we demonstrate good strain transmission at the...
Preprint
Full-text available
Epitaxial films may be released from growth substrates and transferred to structurally and chemically incompatible substrates, but epitaxial films of transition metal perovskite oxides have not been transferred to electroactive substrates for voltage control of their myriad functional properties. Here we demonstrate good strain transmission at the...
Article
Full-text available
Vertical stacking of atomically thin layered materials opens new possibilities for the fabrication of heterostructures with favorable optoelectronic properties. The combination of graphene, hexagonal boron nitride and semiconducting transition metal dichalcogenides allows fabrication of electroluminescence (EL) devices, compatible with a wide range...
Preprint
Vertical stacking of atomically thin layered materials opens new possibilities for the fabrication of heterostructures with favorable optoelectronic properties. The combination of graphene, hexagonal boron nitride and semiconducting transition metal dichalcogenides allows fabrication of electroluminescence (EL) devices, compatible with a wide range...
Article
Two Methods for Measuring Lamellae Thicknesses In situ for Improved FIB Specimen Preparation - Volume 25 Supplement - Alexander Rakowski, Evan Tillotson, Aidan Rooney, Sarah Haigh
Article
GaSe and InSe are important members of a class of 2D materials, the III-VI metal monochalcogenides, which are attracting considerable attention due to their promising electronic and optoelectronic properties. Here an investigation of point and extended atomic defects formed in mono-, bi-, and few-layer GaSe and InSe crystals is presented. Using sta...
Article
Atomically thin films of III-VI post-transition metal chalcogenides (InSe and GaSe) form an interesting class of two-dimensional semiconductor that feature a strong variation of their band gap as a function of the number of layers in the crystal and, specifically for InSe, an expected crossover from a direct gap in the bulk to a weakly indirect ban...
Preprint
Full-text available
Atomically thin films of III-VI post-transition metal chalcogenides (InSe and GaSe) form an interesting class of two-dimensional semiconductor that feature strong variations of their band gap as a function of the number of layers in the crystal [1-4] and, specifically for InSe, an earlier predicted crossover from a direct gap in the bulk [5,6] to a...
Article
Full-text available
Similar to silicon-based semiconductor devices, van der Waals heterostructures require integration with high- k oxides. Here, we demonstrate a method to embed and pattern a multifunctional few-nanometer-thick high- k oxide within various van der Waals devices without degrading the properties of the neighboring two-dimensional materials. This transf...
Preprint
Full-text available
Like silicon-based semiconductor devices, van der Waals heterostructures will require integration with high-K oxides. This is needed to achieve suitable voltage scaling, improved performance as well as allowing for added functionalities. Unfortunately, commonly used high-k oxide deposition methods are not directly compatible with 2D materials. Here...
Preprint
Full-text available
Hexagonal boron nitride (hBN) is a prototypical high-quality two-dimensional insulator and an ideal material to study tunneling phenomena, as it can be easily integrated in vertical van der Waals devices. For spintronic devices, its potential has been demonstrated both for efficient spin injection in lateral spin valves and as a barrier in magnetic...
Article
Full-text available
The high mechanical strength and excellent flexibility of 2D materials such as graphene are some of their most important properties [1]. Good flexibility is key for exploiting 2D materials in many emerging technologies, such as wearable electronics, bioelectronics, protective coatings and composites [1] and recently bending has been suggested as a...
Article
Full-text available
Gas permeation through nanoscale pores is ubiquitous in nature and has an important role in many technologies1,2. Because the pore size is typically smaller than the mean free path of gas molecules, the flow of the gas molecules is conventionally described by Knudsen theory, which assumes diffuse reflection (random-angle scattering) at confining wa...
Preprint
Full-text available
Gas permeation through nanoscale pores is ubiquitous in nature and plays an important role in a plethora of technologies. Because the pore size is typically smaller than the mean free path of gas molecules, their flow is conventionally described by the Knudsen theory that assumes diffuse reflection (random-angle scattering) at confining walls. This...
Article
Full-text available
The surface oxidation of aluminum is still poorly understood despite its vital role as an insulator in electronics, in aluminum–air batteries, and in protecting the metal against corrosion. Here we use atomic resolution imaging in an environmental transmission electron microscope (TEM) to investigate the mechanism of aluminum oxide formation. Harne...
Article
Full-text available
Vertically stacked van der Waals heterostructures are a lucrative platform for exploring the rich electronic and optoelectronic phenomena in two-dimensional materials. Their performance will be strongly affected by impurities and defects at the interfaces. Here we present the firstsystematic study of interfaces in van der Waals heterostructure usin...
Article
Understanding 2D Crystal Vertical Heterostructures at the Atomic Scale Using Advanced Scanning Transmission Electron Microscopy - Volume 23 Issue S1 - Sarah J. Haigh, Aidan P. Rooney, Tom J.A. Slater, Eric Prestat, Ekaterina Khestanova, Rob Dryfe, Matej Velický, Roman V. Gorbachev, Rada Boya, Yang Cao, Irina Grigorieva, Kostya Novoselov, Fred Withe...
Article
Full-text available
Graphene is hailed as an ideal material for spintronics due to weak intrinsic spin-orbit interaction that facilitates lateral spin transport and tunability of its electronic properties, including a possibility to induce magnetism in graphene. Another promising application of graphene is related to its use as a spacer separating ferromagnetic metals...
Chapter
The new generation of aberration corrected scanning transmission electron microscope (STEM) instruments optimized for high spatial resolution energy dispersive x-ray (EDX) spectroscopy provide exciting opportunities for elemental analysis of nanoscale objects. Here I will discuss recent example applications from our studies of nanoparticle catalyst...
Chapter
Monolayers of 2D transition metal dichalcogenides (TMDCs) provide excellent semiconducting counterparts to insulating hexagonal boron nitride (hBN) and conductive graphene.[1] Combining all three materials in a Van der Waals vertical heterostructure allows the electronic, photovoltaic and electroluminescent properties of the TMDCs to be studied.[2]...
Article
Full-text available
Utilizing a pair of quick, scalable electrochemical processes, the permanently porous MOF HKUST-1 was electrochemically grown on a copper electrode and this HKUST-1-coated electrode was used to template electrodeposition of a gold nanostructure within the pore network of the MOF. Transmission electron microscopy demonstrates that a proportion of th...
Article
Nanometre-scale pores and capillaries have long been studied because of their importance in many natural phenomena and their use in numerous applications1. A more recent development is the ability to fabricate artificial capillaries with nanometre dimensions, which has enabled new research on molecular transport and led to the emergence of nanoflui...
Article
Full-text available
We report the electrochemical detection of the redox active cardiac biomarker myoglobin (Mb) using aptamer-functionalised black phosphorus nanostructured electrodes by measuring direct electron transfer. The as-synthesised few layer black phosphorus nanosheets have been functionalised with poly-L-lysine (PLL) to facilitate binding with generated an...
Article
Monolayers of molybdenum and tungsten dichalcogenides are direct bandgap semiconductors, which makes them promising for opto-electronic applications. In particular, van der Waals heterostructures consisting of monolayers of MoS2 sandwiched between atomically thin hexagonal boron nitride (hBN) and graphene electrodes allows one to obtain light emitt...
Article
Cross sectional STEM imaging and analysis of multilayered two dimensional crystal heterostructure devices - Volume 21 Issue S3 - Sarah J. Haigh, Aidan P. Rooney, Eric Prestat, Fred. Withers, O. Del Pozo Zamudio, Artem Mishchenko, Ali. Gholinia, K. Watanabe, T. Taniguchi, A. I. Tartakovskii, Andre K. Geim, Konstantin. S. Novoselov
Article
Many layered materials can be cleaved down to individual atomic planes, similar to graphene, but only a small minority of them are stable under ambient conditions. The rest reacts and decomposes in air, which has severely hindered their investigation and possible uses. Here we introduce a remedial approach based on cleavage, transfer, alignment and...
Article
Full-text available
The advent of graphene and related 2D materials has recently led to a new technology: heterostructures based on these atomically thin crystals. The paradigm proved itself extremely versatile and led to rapid demonstration of tunnelling diodes with negative differential resistance, tunnelling transistors5, photovoltaic devices, etc. Here we take the...
Article
A combined single-source precursor approach has been developed for the deposition of thin films of Cr-doped molybdenum disulfide (MoS2) by aerosol-assisted chemical vapour deposition (AACVD). Tris(diethyldithiocarbamato)chromium(III), can also be used for the deposition of chromium sulfide (CrS). Films have been analysed by a range of techniques in...
Article
We have used elastomeric stamps with periodically varying adhesive properties to introduce structure and print folded graphene films. The structure of the induced folds is investigated with scanning probe techniques, high resolution electron-microscopy and tip-enhanced Raman spectroscopy. Furthermore, a finite element model is developed to show the...
Technical Report
Full-text available
Using the Q500 Thermogravimetric Analyzer (TGA) it is demonstrated that it is possible to monitor the real time growth of Single Walled Carbon Nanotubes (SWCNTs) by Chemical Vapour Deposition (CVD) on SiO 2 supported Ni catalyst. The catalyst is made by first dissolving Ni(NO 3)·6H 2 O and SiO 2 in acetone and then allowing the acetone to evaporate...
Article
The constant-voltage electrical stress and 10-keV X-ray irradiation responses of encapsulated graphene-hBN devices are evaluated. Both constant-voltage stress and X-ray exposure induce only modest shifts in the current and the Dirac point of the graphene. Charge trapping at or near the graphene/BN interface is observed after X-ray irradiation. The...
Article
The new paradigm of heterostructures based on two-dimensional (2D) atomic crystals has already led to the observation of exciting physical phenomena and creation of novel devices. The possibility of combining layers of different 2D materials in one stack allows unprecedented control over the electronic and optical properties of the resulting materi...

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Projects

Projects (3)
Project
Using different techniques to engineer the bandgap of semiconducting transition metal dichalcogenides via induced strain. Applications will span from high-speed electronics to optics and energy harvesting.
Archived project
Photoluminescence and solar cell application