A5009336855- 2D Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Graphene research and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Supercapacitor Materials and Fabrication
- Conducting polymers and applications
- MXene and MAX Phase Materials
- Graphene and Nanomaterials Applications
- Electrocatalysts for Energy Conversion
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Nanocluster Synthesis and Applications
- Membrane Separation Technologies
- Electrospun Nanofibers in Biomedical Applications
- Advanced Polymer Synthesis and Characterization
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Photocatalysis Techniques
- Dendrimers and Hyperbranched Polymers
- Transition Metal Oxide Nanomaterials
- Membrane Separation and Gas Transport
- Protein Interaction Studies and Fluorescence Analysis
- Polymer crystallization and properties
- Block Copolymer Self-Assembly
- Advanced Nanomaterials in Catalysis
- Water Quality Monitoring Technologies
Trinity College Dublin
2014-2023
Advanced Materials and BioEngineering Research
2014-2023
Dublin City University
2014-2021
Materials and Energy Research Center
2009-2012
Few layer black phosphorus is a new two-dimensional material which of great interest for applications, mainly in electronics. However, its lack stability severely limits our ability to synthesise and process this material. Here we demonstrate that high-quality, few-layer nanosheets can be produced large quantities by liquid phase exfoliation the solvent N-cyclohexyl-2-pyrrolidone (CHP). We control nanosheet dimensions have developed metrics estimate both size thickness spectroscopically....
In order to fulfill their potential for applications, it will be necessary develop large-scale production methods two-dimensional (2D) inorganic nanosheets. Here we demonstrate the shear-exfoliation of molybdenum disulfide nanosheets in aqueous surfactant solution using a kitchen blender. Using standard procedures, measure how MoS2 concentration and rate scale with processing parameters. However, also use recently developed based on optical spectroscopy simultaneously both nanosheet lateral...
The successful commercialization of smart wearable garments is hindered by the lack fully integrated carbon-based energy storage devices into wearables. Since electrodes are active components that determine performance systems, it important to rationally design and engineer hierarchical architectures atboth nano- macroscale can enjoy all necessary requirements for a perfect electrode. Here we demonstrate large-scale flexible fabrication highly porous high-performance multifunctional graphene...
Although transition metal dichalcogenides such as MoS2 have been recognized highly potent two-dimensional nanomaterials, general methods to chemically functionalize them are scarce. Herein, we demonstrate a functionalization route that results in organic groups bonded the surface via covalent C–S bonds. This is based on lithium intercalation, chemical exfoliation and subsequent quenching of negative charges residing by electrophiles diazonium salts. Typical degrees 10–20 atom % potentially...
Here, we demonstrate the production of large quantities gallium sulfide (GaS) nanosheets by liquid exfoliation layered GaS powder. The was achieved sonication powder in suitable solvents. variation dispersed concentration with solvent consistent classical solution thermodynamics and showed successful solvents to be those Hildebrand solubility parameters close 21.5 MPa1/2. In this way, could produced at concentrations up ∼0.2 mg/mL lateral sizes thicknesses 50–1000 nm 3–80 layers,...
While 2D transition metal dichalcogenides are known to be promising materials for electrocatalysis of hydrogen production, it is not clear which member this family the most effective catalyst. Here we perform a comprehensive study, comparing catalytic performance electrodes consisting porous arrays liquid exfoliated MX2 nanosheets (M = Mo, W; X S, Se, Te). We find hierarchy with selenides > sulphides tellurides MoSe2 clearly out-performing other materials. In all cases performance, as...
Here we demonstrate that the performance of catalytic electrodes, fabricated from liquid exfoliated MoS2 nanosheets, can be optimized by maximizing electrode thickness coupled with addition carbon nanotubes. We find current, and so H2 generation rate, at a given potential to increase linearly up ∼5 μm after which saturation occurs. This linear is consistent simple model allows figure merit extracted. The magnitude this implies approximately two-thirds possible catalytically active edge sites...
Although many electrochemical properties of 2D materials depend sensitively on the nanosheet dimensions, there are no systematic, quantitative studies which analyze effect size and thickness parameters. Here we use size-selected WS2 nanosheets as a model system to determine dimensions in two representative areas: hydrogen evolution electrocatalytic electrodes double layer capacitor electrodes. We chose these applications, they interaction ions with edge basal plane, respectively, so would be...
Here we demonstrate significant improvements in the performance of supercapacitor electrodes based on 2D MnO2 nanoplatelets by addition carbon nanotubes. Electrodes do not display high areal capacitance because electrical properties such films are poor, limiting transport charge between redox sites and external circuit. In addition, mechanical strength is low, achievable electrode thickness, even presence binders. By adding nanotubes to MnO2-based electrodes, have increased conductivity up 8...
While liquid phase exfoliation can be used to produce nanosheets stabilized in polymer solutions, very little is known about the resultant nanosheet size, thickness, or monolayer content. The present study uses semiquantitative spectroscopic metrics based on extinction, Raman, and photoluminescence (PL) spectroscopy investigate these parameters for WS 2 exfoliated aqueous poly(vinyl alcohol) (PVA) solutions. By measuring Raman PL simultaneously, content tracked via PL/Raman intensity ratio...
The remarkable adsorption capacity of graphene-derived materials has prompted their examination in composite suitable for deployment treatment contaminated waters. In this study, crosslinked calcium alginate–graphene oxide beads were prepared and activated by exposure to pH 4 using 0.1M HCl. investigated as novel adsorbents the removal organic pollutants (methylene blue dye pharmaceuticals famotidine diclofenac) with a range physicochemical properties. effects initial pollutant...
We describe the soft chemistry synthesis of amine-templated gallium chalcogenide nanotubes through reaction gallium(III) acetylacetonate and chalcogen (sulfur, selenium) using a mixture long-chain amines (hexadecylamine dodecylamine) as solvent. Beyond their role solvent, also act template, directing growth discrete units with one-dimensional multilayer tubular nanostructure. These new materials, which broaden family amine-stabilized chalcogenides, can be tentatively classified direct large...
Abstract In recent years, various functionalization strategies for transition‐metal dichalcogenides have been explored to tailor the properties of materials and provide anchor points fabrication hybrid structures. Herein, new insights into role surfactant in reactions are described. Using spontaneous reaction WS 2 with chloroauric acid as a model reaction, regioselective formation gold nanoparticles on is shown be heavily dependent employed. A simple developed explain chosen this...
In this study, polyvinylidene fluoride (PVDF) membranes with various structures ranging from dense to highly asymmetric morphologies were obtained by changing the effective parameters in phase inversion process. The effect of some important processing such as solution concentration, harshness precipitation bath, exposure time before immersion coagulation bath and temperature was studied mentioned optimized. then modified nano-sized alumina powder order improve hydrophilicity PVDF membranes....
Abstract In recent years, various functionalization strategies for transition‐metal dichalcogenides have been explored to tailor the properties of materials and provide anchor points fabrication hybrid structures. Herein, new insights into role surfactant in reactions are described. Using spontaneous reaction WS 2 with chloroauric acid as a model reaction, regioselective formation gold nanoparticles on is shown be heavily dependent employed. A simple developed explain chosen this...
Graphene oxide/Ag nanoparticle (AgGO) composite materials have been proposed for surface enhanced Raman scattering (SERS) detection of fluorescent dye molecules.In this study we examine the role different components Ag (NP) decorated graphene oxide (GO) on fluorescence quenching properties three dyes; Rhodamine 6G (R6G), B (RhB) and Sulforhodamine 101 (SR101), with emission spanning from approximately 550 nm to 750 nm.The influence properties, spectrum quantum yield, SERS GO AgGO substrates...
The remarkable adsorption capacity of graphene derived materials has prompted their examination in composite suitable for deployment treatment contaminated waters. In this study, crosslinked calcium alginate – oxide beads were prepared and activated by exposure to pH 4 using 0.1M HCl. investigated as novel adsorbents the removal organic pollutants (Methylene Blue dye pharmaceuticals Famotidine Diclofenac) with a range physicochemical properties. Effects initial pollutant...
In the last decade, new potential applications of micro- and nano-products in telecommunication, medical diagnostics, photovoltaic, optoelectronic systems have increased interest to develop micro-engineering technologies. Injection molding polymeric materials is a recent method being adapted for serial manufacturing optic components packaging at nano-scale. Quality assurance replication into small cavities an important but underdeveloped factor that needed ensure high production efficiency...
In this study, TiO 2 / PAN -based fibers were prepared by electrospinning a composite solution containing both the desirable contents of and 10 wt. % polymer dissolved in N , -dimethylformamide. The loaded electrospun nanofibers then carbonized at 1000 °C atmosphere furnace after stabilization 230 air. Then CNF oxidized 450 morphology structure -embeded carbon investigated SEM Raman spectroscopy. Specific surface area was determined using BET equation from adsorption analysis. Photocatalytic...
We studied the kinetics of swelling in high-χ lamellar-forming poly(styrene)-block- poly(lactic acid) (PS-b-PLA) block copolymer (BCP) by varying heating rate and monitoring solvent vapour pressure substrate temperature situ during solvo-thermal annealing (STVA) an oven, analysing resulting morphology. Our results demonstrate that there is not only a threshold (120 kPa), but also reaching this has significant effect on microphase separation morphologies. To study effect, identical films were...
The emission and Raman scattering properties of three dyes, Rhodamine 6G (R6G), B (RhB) Sulforhodamine 101 (SR101), were characterised on graphene oxide (GO) Ag nanoparticle (NP) decorated (AgGO) substrates to examine the impact fluorescence quenching surface enhanced (SERS) detection. Strong correlation is found between time-resolved data peak signal-to-noise ratios (SNRs). efficiency GO largest for R6G, while lifetime SR101 most strongly affected by addition NPs. R6G demonstrate higher...
In order to translate the superior properties of carbon nanofibers (CNFs) macro-scale structures, an electrospinning route capable placing CNFs into a continuous nano-scale composite fibril is introduced. this work, fibers were produced by solution polyacrylonitrile ( PAN ) with dispersed in dimethylformamide DMF ), which effective solvent for nanofibers. Atomic force microscopy (AFM) and scanning electron (SEM) demonstrated rough globular surfaces on CNF containing fibers. Raman spectra...