A5058315467- 2D Materials and Applications
- Graphene research and applications
- Chalcogenide Semiconductor Thin Films
- Advanced Memory and Neural Computing
- Molecular Junctions and Nanostructures
- Ferroelectric and Negative Capacitance Devices
- Electronic and Structural Properties of Oxides
- Nanowire Synthesis and Applications
- MXene and MAX Phase Materials
- Material Properties and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Mass Spectrometry Techniques and Applications
- Solid-state spectroscopy and crystallography
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Machine Learning in Materials Science
- Microfluidic and Capillary Electrophoresis Applications
- Plasmonic and Surface Plasmon Research
- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Spacecraft Design and Technology
- Quantum-Dot Cellular Automata
- Advanced Materials and Mechanics
- Surface and Thin Film Phenomena
Queen's University Belfast
2018-2020
Queens University
2020
University of Ulster
2020
Belfast City Hospital
2020
University of Central Oklahoma
2003
University of Wyoming
2003
Exfoliation of large-area monolayers is important for fundamental research and technological implementation transition-metal dichalcogenides. Various techniques have been explored to increase the exfoliation yield, but little known about underlying mechanism at atomic level. Here, we demonstrate gold-assisted mechanical monolayer molybdenum disulfide, up a centimeter scale. Detailed spectroscopic, microscopic, first-principles density functional theory analyses reveal that strong van der...
Gold-mediated exfoliation of MoS2 has attracted considerable interest in the recent years. A strong interaction between and Au facilitates preferential production centimeter-sized monolayer with near-unity yield provides a heterostructure system noteworthy from fundamental standpoint. However, little is known about detailed nature MoS2-Au its evolution thickness. Here, we identify specific vibrational binding energy fingerprints such using Raman X-ray photoelectron spectroscopy, which...
Abstract Mechanical exfoliation yields high‐quality 2D materials but is challenging to scale up due the small lateral size and low yield of exfoliated crystals. Gold‐mediated macroscale monolayer MoS 2 related crystals addresses this problem. However, it remains unclear whether method can be extended other metals. Herein, mechanical on a range metallic substrates studied. It found that Au outperforms all metals in their ability exfoliate . This rationalized by gold's resist oxidation, which...
Extraordinarily high optical contrast is instrumental to research and applications of two-dimensional materials, such as, for rapid identification thickness, characterisation properties, quality assessment. With optimal designs substrate structures light illumination conditions, unprecedented MoS2 on Au surfaces exceeding 430% monolayer over 2600% bilayer achieved. This realised custom-designed substrates near-zero reflectance near the normal incidence. In particular, by using an aperture...
A multilayered biosensor was constructed and found to detect trinitrotoluene (TNT) in ppb concentrations air both prior after detonation of TNT without use a liquid phosphate buffered saline (PBS) superstrate. The surface fabricated from monoclonal antibody for covalently bound an 11,11′-dithio-bis(succinimidoylundecanoate) (DSU) self-assembled monolayer immobilized on thin gold film bonded BK7 glass slide. binding between the antigen detected using plasmon resonance spectroscopy (SPRS)....
Metals have been increasingly used as substrates in devices based on two-dimensional (2D) materials. However, the high reflectivity of bulk metals results low optical contrast (<3%) and therefore poor visibility transparent mono- few-layer 2D materials these surfaces. Here we demonstrate that by engineering complex a purpose-designed multilayer heterostructure composed thin Au films (2-8 nm) SiO2/Si substrate, graphene oxide (GO) can be significantly enhanced comparison to Au, up about 3 5...
Laser-controlled reduction of individual graphene oxide films provide unprecedented work function tuning with millivolt precision.
Non-volatile resistive switching, also known as memristor effect in two terminal devices, has emerged one of the most important components ongoing development high-density information storage, brain-inspired computing, and reconfigurable systems. Recently, unexpected discovery atomic monolayers transitional metal dichalcogenide sandwich structures added a new dimension interest owing to prospects size scaling associated benefits. However, origin switching mechanism sheets remains uncertain....
Photomechanics, i.e., the conversion of light into thermal and mechanical work is significant importance for energy conversion/reconfigurable technologies. Advantages such photo-thermal mechanisms transducers include remote transfer, controllability, control actuation using number photons (intensity) photon energies (wavelength), fast (milliseconds), low signal to noise ratio, high stored elastic strain densities with hyperelastic elastomers scalability at different length scales batch...
Atomically-thin two-dimensional (2D) materials have attracted remarkable interest in a wide range of research and applications. However, one the main challenges is how to visualise extremely thin films accurately identify its layer thickness. Due ultimately thickness low absorption light, many 2D films, such as graphene, graphene oxide hexagonal boron nitride (hBN) are nearly completely transparent on most surfaces. They only visible when deposited specific contrast-enhancing substrates....
Mechanical exfoliation is one of the most important methods fabricating high-quality two-dimensional (2D) materials. Compared against other fabrication techniques such as chemical vapor deposition (CVD) and liquid phase exfoliation, films exfoliated by traditional scotch-tape method retain high quality pristine crystals are clean with little contamination. As such, they instrumental to research technological development in field 2D