A5044316168- Advanced Sensor and Energy Harvesting Materials
- Graphene research and applications
- Conducting polymers and applications
- 2D Materials and Applications
- Advanced Fiber Laser Technologies
- Advancements in Battery Materials
- MXene and MAX Phase Materials
- Gas Sensing Nanomaterials and Sensors
- Advanced Memory and Neural Computing
- Nanomaterials and Printing Technologies
- Photonic and Optical Devices
- Electromagnetic wave absorption materials
- Nanowire Synthesis and Applications
- Advanced Battery Materials and Technologies
- Anodic Oxide Films and Nanostructures
- Supercapacitor Materials and Fabrication
- Quantum Dots Synthesis And Properties
- Graphene and Nanomaterials Applications
- Ferroelectric and Negative Capacitance Devices
- ZnO doping and properties
- Perovskite Materials and Applications
- Additive Manufacturing and 3D Printing Technologies
- Electrochemical sensors and biosensors
- Spectroscopy and Laser Applications
- Polydiacetylene-based materials and applications
Advanced Materials and BioEngineering Research
2022-2025
Trinity College Dublin
2022-2025
University of Cambridge
2016-2023
Imperial College London
2021
Lawrence Livermore National Laboratory
2015
Fully printed wearable electronics based on two-dimensional (2D) material heterojunction structures also known as heterostructures, such field-effect transistors, require robust and reproducible multi-layer stacks consisting of active channel, dielectric conductive contact layers. Solution processing graphite other layered materials provides low-cost inks enabling electronic devices, for example by inkjet printing. However, the limited quality 2D-material inks, complexity arrangement, lack a...
Graphene, related two-dimensional crystals and hybrid systems showcase several key properties that can address emerging needs in electronics optoelectronics, particular for the ever growing markets of printed, flexible wearable electronic devices. Graphene's flexibility, large surface area, chemical stability, combined with its excellent electrical thermal conductivity, make it promising as a printed electrodes Chemically functionalized graphene self-assembly graphene-organic molecule...
Abstract Saturable absorbers (SA) operating at terahertz (THz) frequencies can open new frontiers in the development of passively mode-locked THz micro-sources. Here we report fabrication SAs by transfer coating and inkjet printing single few-layer graphene films prepared liquid phase exfoliation graphite. Open-aperture z -scan measurements with a 3.5 quantum cascade laser show transparency modulation ∼80%, almost one order magnitude larger than that reported to date frequencies....
Abstract Air‐stable semiconducting inks suitable for complementary logic are key to create low‐power printed integrated circuits (ICs). High‐performance printable electronic with 2D materials have the potential enable next generation of high performance low‐cost digital electronics. Here, authors demonstrate air‐stable, low voltage (<5 V) operation inkjet‐printed n‐type molybdenum disulfide (MoS 2 ), and p‐type indacenodithiophene‐ co ‐benzothiadiazole (IDT‐BT) field‐effect transistors...
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 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...
Here, we formulate low surface tension (∼30 mN/m) and boiling point (∼79 °C) inks of graphene, single-wall carbon nanotubes conductive polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) demonstrate their viability for spray-coating morphologically uniform (Sq ≈ 48 ± 3 nm), transparent conducting films (TCFs) at room temperature (∼20 °C), which conform to three dimensional curved surfaces. Large area (∼750 cm2) hybrid PEDOT:PSS/graphene achieved an optical...
Abstract Laser diodes are efficient light sources. However, state-of-the-art laser diode-based lighting systems rely on light-converting inorganic phosphor materials, which strongly limit the efficiency and lifetime, as well achievable output due to energy losses, saturation, thermal degradation, low irradiance levels. Here, we demonstrate a macroscopically expanded, three-dimensional diffuser composed of interconnected hollow hexagonal boron nitride microtubes with nanoscopic...
Advances in materials development, fabrication processes, and applications for various fibre electronics are reviewed. Their integration into multifunctional electronic textiles the key challenges large-scale manufacturing discussed.
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 (
In this work graphene-based aerogel anodes and graphene/stainless steel cathodes have been optimised as platinum-free electrodes in <italic>Rhodopseudomonas palustris</italic> microbial fuel cells, achieving a maximum power output of ∼3.5 W m<sup>−3</sup>.
Although printed networks of semiconducting nanosheets have found success in a range applications, conductive nanosheet are limited by low conductivities (<106 S m-1 ). Here, dispersions silver (AgNS) that can be into highly described. Using commercial thermal inkjet printer, AgNS patterns with unannealed up to (6.0 ± 1.1) × 106 printed. These form electromagnetic interference shields record shielding effectiveness >60 dB the microwave region at thicknesses <200 nm. High resolution line...
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...
Developing high-performance cathode materials for lithium-ion batteries is necessary to maximise both energy and power density. One promising material iron trifluoride (FeF3) having a high theoretical capacity of 712 mAh/g, although achieving this value experimentally challenging. Our previous works has shown that achievable can be maximised when active are in two-dimensional (2D) form. Liquid-phase exfoliation (LPE) method seems intuitively inappropriate produce 2D-platelets from...
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...
Nitrogen dioxide (NO2) is a gaseous air pollutant linked to respiratory and cardiovascular diseases environmental problems such as acid rain tropospheric ozone formation. Reference instruments for measuring NO2 are expensive, highlighting the need develop low cost sensor technologies wider scale monitoring of this critical pollutant. Here, we report development scalable using electrochemically exfoliated 2D molybdenum disulfide (MoS2) networks. The can detect wide range concentrations at...
Carrier multiplication (CM), where a single high-energy photon generates multiple electron-hole pairs, offers promising route to enhance the efficiency of solar cells and photodetectors.Transition metal dichalcogenides, such as 2H-MoTe2 2H-WSe2, exhibit efficient CM. Given similar electronic band structure 2H-MoSe2, it is expected show comparable CM efficiency. In this study, we establish occurrence in solution-processed thin film bulk-like 2H-MoSe2. We characterize dynamics excitons free...
Abstract Recent efforts to develop cathode materials for potassium‐ion batteries (KIBs) have focused on maximizing specific capacity. However, real applications will require thick electrodes with high areal capacity that can achieve reasonable rate performance, which is a significant challenge. While Prussian blue analogs (PBAs) show promise fast K‐ion storage, they often bespoke synthesis. In this study, potassium ferricyanide (K 3 Fe(CN) 6 , KFC) explored as commercially available and...
Two dimensional (2D) materials are a rapidly growing area of interest for wearable electronics, due to their flexible and unique electrical properties.
Abstract Multiple studies have reported the observation of electro‐synaptic response in different metal/insulator/metal devices. However, most them analyzed large ( > 1 µ m 2 ) devices that do not meet integration density required by industry (10 10 devices/mm ). Some emploied a scanning tunneling microscope (STM) to explore nano‐synaptic materials, but this setup there is nanogap between insulator and one metallic electrodes (i.e., STM tip), present real Here, it demonstrated how use...
Abstract The development of sodium ion batteries will require high‐performance electrodes with very large areal capacity and reasonable rate performance. Although red phosphorus is a promising electrode material, it has not yet fulfilled these requirements. Here, liquid phase exfoliation used to convert solid into amorphous, quasi‐2D nanoplatelets. These nanoplatelets have lateral sizes hundreds nanometers, thickness 10s nanometers are quite stable in ambient conditions, displaying only low...
The ability to engineer quantum-cascade-lasers (QCLs) with ultrabroad gain spectra, and a full compensation of the group velocity dispersion, at terahertz (THz) frequencies, is key for devising monolithic miniaturized optical frequency-comb-synthesizers (FCSs) in far-infrared. In THz QCLs four-wave mixing, driven by intrinsic third-order susceptibility intersubband medium, self-locks modes phase, allowing stable comb operation, albeit over restricted dynamic range (∼20% laser operational...
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...