A5066216837- Advanced Sensor and Energy Harvesting Materials
- Graphene research and applications
- Conducting polymers and applications
- 2D Materials and Applications
- Anodic Oxide Films and Nanostructures
- Perovskite Materials and Applications
- Nanopore and Nanochannel Transport Studies
- Quantum Dots Synthesis And Properties
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanowire Synthesis and Applications
- Molecular Junctions and Nanostructures
- Photonic Crystals and Applications
- Digital Image Processing Techniques
- Innovative Microfluidic and Catalytic Techniques Innovation
- Advanced Thermoelectric Materials and Devices
- Graphene and Nanomaterials Applications
- Semiconductor materials and devices
- Nanomaterials and Printing Technologies
- Additive Manufacturing and 3D Printing Technologies
- Advanced Photocatalysis Techniques
- Microfluidic and Bio-sensing Technologies
- Carbon Nanotubes in Composites
- Semiconductor materials and interfaces
- Ion-surface interactions and analysis
- Planetary Science and Exploration
Trinity College Dublin
2021-2025
Advanced Materials and BioEngineering Research
2022-2025
The investigation of high-mobility two-dimensional (2D) flakes beyond molybdenum disulfide (MoS2) will be necessary to create a library solution-processed networks that conform substrates and remain functional over thousands bending cycles. Here we report electrochemical exfoliation large-aspect-ratio (>100) semiconducting tungsten diselenide (WSe2) (WS2) as well MoS2 comparison. We use Langmuir-Schaefer coating achieve highly aligned conformal flake networks, with minimal mesoporosity...
Abstract Networks of solution-processed nanomaterials are becoming increasingly important across applications in electronics, sensing and energy storage/generation. Although the physical properties these devices often completely dominated by network morphology, structure itself remains difficult to interrogate. Here, we utilise focused ion beam – scanning electron microscopy nanotomography (FIB-SEM-NT) quantitatively characterise morphology printed nanostructured networks their using...
Abstract Networks of nanowires, nanotubes, and nanosheets are important for many applications in printed electronics. However, the network conductivity mobility usually limited by resistance between particles, often referred to as junction resistance. Minimising has proven be challenging, partly because it is difficult measure. Here, we develop a simple model electrical conduction networks 1D or 2D nanomaterials that allows us extract nanoparticle resistances from particle-size-dependent DC...
Printed strain sensors will be important in applications such as wearable devices, which monitor breathing and heart function. Such need to combine high sensitivity low resistance with other factors cyclability, hysteresis, minimal frequency/strain-rate dependence. Although nanocomposite can display a gauge factor (
Abstract The scalable production of two-dimensional (2D) materials is needed to accelerate their adoption industry. In this work, we present a low-cost in-line and enclosed process exfoliation based on high-shear mixing create aqueous dispersions few-layer graphene, large scale with Y w ~ 100% yield by weight throughput ϕ 8.3 g h −1 . minimises basal plane defects compared traditional beaker-based shear which attribute reduced Reynolds number, Re 10 5 We demonstrate highly conductive...
Thin films fabricated from solution-processed graphene nanosheets are of considerable technological interest for a wide variety applications, such as transparent conductors, supercapacitors, and memristors. However, very thin printed tend to have low conductivity compared thicker ones. In this work, we demonstrate simple layer-by-layer deposition method which yields highly-aligned, electrochemically-exfoliated roughness nanometer-scale thickness control. By optimising the parameters, with...
Energy harvesting technologies play a pivotal role in powering the next generation of wearable and portable devices, where thin-film thermoelectric generators (TEGs) offer compact flexible solution.
Abstract Wearable devices have generally been rigid due to their reliance on silicon‐based technologies, while future wearables will utilize flexible components for example transistors within microprocessors manage data. Two‐dimensional (2D) semiconducting flakes yet be investigated in fiber but can offer a route toward high‐mobility, biocompatible, and fiber‐based devices. Here, the electrochemical exfoliation of 2D tungsten diselenide (WSe 2 ) molybdenum disulfide (MoS is shown achieve...
Printed networks of graphene nanosheets are promising piezoresistive materials. This work combines experimental and theoretical approaches to understand the relationship between nanosheet size sensitivity (gauge factor).
Transparent conductors (TCs) represent key components in many applications from optoelectronic devices to electromagnetic shielding. While commercial typically use thin films of indium tin oxide, this material is brittle and increasingly scarce, meaning higher performing cheaper alternatives are sought after. Solution-processible metals would be ideal owing their high conductivities printability. However, due opacity visible light, such need very achieve transparency, thus limiting the...
Solution-processable 2D materials are promising candidates for a range of printed electronics applications. Yet maximizing their potential requires solution-phase processing nanosheets into high-quality networks with carrier mobility (μNet) as close possible to that individual (μNS). In practice, the presence internanosheet junctions generally limits electronic conduction, such ratio junction resistance (RJ) nanosheet (RNS), determines network via μNS/μNet ≈ RJ/RNS + 1. Hence, achieving < 1...
Abstract Networks of solution-processed nanomaterials are becoming increasingly important across applications in electronics, sensing and energy storage/generation. Although the physical properties these devices often completely dominated by network morphology, structure itself remains difficult to interrogate. Here, we utilise FIB-SEM nanotomography quantitatively characterise morphology nanostructured networks their using nanometre-resolution 3D images. The influence nanosheet/nanowire...
Abstract Constructing a semi‐permanent base on the moon or Mars will require maximal use of materials found in situ and minimization equipment transported from Earth. This mean heavy reliance regolith (Lunar Marian soil) water, supplemented by small quantities additives fabricated Here it is shown that SiO 2 ‐based powders, as well Lunar Martian simulants, can be into building at near‐ambient temperatures using only few weight‐percent carbon nanotubes binder. These composites have...
Graphite is one of only a few layered materials that can be exfoliated into nanosheets with semimetallic properties, which limits the applications nanosheet-based electrodes to material combinations compatible work function graphene. It therefore important identify additional metallic or two-dimensional (2D) nanomaterials processed in solution for scalable fabrication printed electronic devices. Metal diborides represent family non-van der Waals crystals properties all nanosheet thicknesses....
<title>Abstract</title> Although high aspect-ratio 2D materials show great promise for printed electronics, few have yet been tested in these applications. In this study, we synthesised 28 different and used electrochemical exfoliation to produce nanosheets which were then solution-deposited characterization device fabrication. Combining theory experiment revealed that of layered crystals with stiffness anisotropy above a critical value (E<sub>in</sub>/E<sub>out</sub>>1.7) can yield...
Solution-processable 2D materials are promising candidates for a range of printed electronics applications. Yet maximising their potential requires solution-phase processing nanosheets into high-quality networks with carrier mobility ({\mu}Net) as close possible to that individual ({\mu}NS). In practise, the presence inter-nanosheet junctions generally limits electronic conduction, such ratio junction resistance (RJ) nanosheet (RNS), determines network via . Hence, achieving RJ/RNS<1 is...
Many printed electronic applications require strain-independent electrical properties to ensure deformation-independent performance. Thus, developing printed, flexible devices using 2D and other nanomaterials will an understanding of the effect strain on nano-networks. Here we introduce novel AC techniques fully characterise resistance high mobility networks, fabricated from electrochemically exfoliated MoS2 nanosheets. These were initially characterised DC piezoresistance measurements...
Abstract Many printed electronic applications require strain‐independent electrical properties to ensure deformation‐independent performance. Thus, developing printed, flexible devices using 2D and other nanomaterials will an understanding of the effect strain on nano‐networks. Here, novel AC techniques are introduced fully characterize resistance high‐mobility networks, fabricated from electrochemically exfoliated MoS 2 nanosheets. These initially characterized DC piezoresistance...
Networks of solution-processed nanomaterials are important for multiple applications in electronics, sensing and energy storage/generation. While it is known that network morphology plays a dominant role determining the physical properties printed networks, remains difficult to quantify structure. Here, we utilise FIB-SEM nanotomography characterise nanostructured networks. Nanometer-resolution 3D-images were obtained from networks graphene nanosheets various sizes, as well WS2 nanosheets,...
In recent years, the rising demand for close interaction with electronic devices has led to a surge in popularity of wearable gadgets. While gadgets have generally been rigid due their utilisation silicon-based technologies, flexible semiconducting fibre-based transistors will be needed future wearables as active sensing components or within microprocessors manage and analyse data. Two-dimensional (2D) flakes are yet investigated fibre but could offer route toward high-mobility,...
Networks of nanowires and nanosheets are important for many applications in printed electronics. However, the network conductivity mobility usually limited by inter-particle junction resistance, a property that is challenging to minimise because it difficult measure. Here, we develop simple model conduction networks 1D or 2D nanomaterials, which allows us extract nanoparticle resistances from particle-size-dependent D.C. resistivity data conducting semiconducting materials. We find porous...
The development of multimodal nano- and micro-structures has become an increasingly popular area research in recent years. In particular, the combination two or more desirable properties within a single structure opens multiple opportunities from biomedicine, sensing, catalysis, to variety optical applications. Here, for first time, we report synthesis characterization chiroptically active CaCO3 nanocomposites. These composites have been prepared by modified microemulsion method presence...
Non-hydrogenic Rydberg series associated with excitons have been identified in ultraclean monolayer TMDCs. Here, we investigated the radiative properties of excitonic MoTe2 based devices and influence Fermi level position on same. Using low temperature (4K) photoluminescence measurements, observed bright emission from first three states series, namely A1s, 2s 3s. Upon doping either electron or hole side, oscillator strengths are rapidly transferred to corresponding trion (charged...