A5006543741- Block Copolymer Self-Assembly
- Anodic Oxide Films and Nanostructures
- Conducting polymers and applications
- Semiconductor materials and devices
- Machine Learning in Materials Science
- Synthesis and properties of polymers
- Polymer Surface Interaction Studies
- Diamond and Carbon-based Materials Research
- Advanced Materials and Mechanics
- Advanced Polymer Synthesis and Characterization
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Silicon Nanostructures and Photoluminescence
- Advanced Electron Microscopy Techniques and Applications
- Nanofabrication and Lithography Techniques
- Organic Electronics and Photovoltaics
- Lignin and Wood Chemistry
- High voltage insulation and dielectric phenomena
- Electron and X-Ray Spectroscopy Techniques
- Photonic Crystals and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Optical Coatings and Gratings
- Nonlinear Optical Materials Studies
- Advanced Surface Polishing Techniques
- Mesoporous Materials and Catalysis
Trinity College Dublin
2016-2024
Advanced Materials and BioEngineering Research
2021-2024
Abstract Nanocomposites of layered MoS 2 and multi‐walled carbon nanotubes (CNTs) with core–shell structure were prepared by a simple solvothermal method. The formation nanosheets on the surface coaxial CNTs has been confirmed scanning electron microscopy, transmission absorption spectrum, Raman spectroscopy, X‐ray photoelectron spectroscopy. Enhanced third‐order nonlinear optical performances observed for both femtosecond nanosecond laser pulses over broad wavelength range from visible to...
An electrochemical sensor using copper oxide nanodots (CuO nanodots–ITO) developed from a block copolymer template is demonstrated for sensitive and selective determination of dopamine (DA). The current signal CuO nanodots–ITO was linear with the concentration DA in range between 0.12 56.87 μM (R = 0.9975) sensitivity 326.91 μA mM–1 cm–2 detection limit 0.03 μM. Furthermore, anti-interference ability present to possible interfering substances including ascorbic acid, uric acetaminophen,...
The self-assembly of ultra-high molecular weight (UHMW) block copolymers (BCPs) remains a complex and time-consuming endeavor owing to the high kinetic penalties associated with long polymer chain entanglement. In this work, we report unique strategy overcoming these barriers through precision solvent annealing an UHMW polystyrene-block-poly(2-vinylpyridine) BCP system (Mw: ∼800 kg/mol) by fast swelling very levels concentration (ϕs). Phase separation on timescales ∼10 min is demonstrated...
In recent years, the potential of porous soft materials in various device technologies has increased importance due to applications fields, such as wearable electronics, medicine, and transient devices. However, understanding 3-dimensional architecture at microscale remains a challenge. Herein, we present method structurally analyze using Focused Ion Beam - Scanning Electron Microscopy (FIB-SEM) tomography. Two materials, polymethyl methacrylate (PMMA) membrane pine wood veneer were chosen...
Area-selective deposition is a promising technique for positional self-alignment of materials at prepatterned surface. Critical to this the development molecular systems that have selective surface binding and can act as templates material growth. This paper reports how end functionalized polymers be used create oxide films through grafting method. Here, we detail facile approach rapid (in seconds) polymer brush with complete coverage over large areas high uniformity (pinhole free)....
Abstract A platform is introduced for fabrication of a reusable and highly efficient low band gap photocatalyst by confining gold nanoparticles (AuNPs) in the pores nanopatterned Si monolith (AuNSM). Due to their size, maximum two AuNPs can assemble single pore, thus preventing agglomerations. Their access analyte provides more active sites redox reaction, leading enhanced efficiency. While proximity enhances coupling efficiency, confinement prevents rapid recombination photogenerated charge...
A facile and versatile strategy was developed to produce highly ordered porous metal oxide structures via block copolymer (BCP) lithography. Phase separation of poly(2-vinylpyridine)-b-polystyrene (P2VP-b-PS) induced by solvent vapor annealing in a nonselective environment fabricate cylindrical arrays. In this work, we thoroughly analyzed the effects film thickness, time, temperature on ordering P2VP-majority system for first resulting "inverse" structures. Reflectometry, atomic force...
In this work, we show that in order to fabricate coherent titania (TiO2) films with precise thickness control, it is critical generate a complete polymer brush monolayer. To date, demonstrations of such dense monolayer formation can be utilized for inorganic infiltration have been elusive. We describe versatile bottom-up approach covalently and rapidly (60 s processing) graft hydroxyl-terminated poly(2-vinyl pyridine) (P2VP-OH) polymers on silicon substrates. P2VP-OH varying thicknesses...
We present a highly scalable, room-temperature strategy for fabricating vertical silicon nanotube arrays derived from toroidal micelle pattern via water vapor-induced block copolymer (BCP) self-assembly mechanism. A polystyrene-b-poly(ethylene oxide) (PS-b-PEO) BCP system can be self-assembled into structures (diameter: 400–600 nm) on PS-OH-modified substrate in facile manner contrasting with other complex processes described the literature. It was found that minimum PS-b-PEO thickness of...
Rising global demand for biodegradable materials and green sources of energy has brought attention to lignin. Herein, we report a method manufacturing standalone lignin membranes without additives the first time date. We demonstrate scalable macroporous (∼100 200 nm pores) membrane production using four different organosolv under humid environment (>50% relative humidity) at ambient temperatures (∼20 °C). A range thicknesses is reported with densely porous films observed form if thickness...
We demonstrate the fabrication of sub-20 nm gate-all-around silicon (Si) nanowire field effect transistor structures using self-assembly. To create nanopatterned Si feature arrays, a block-copolymer-assisted hard mask approach was utilized topographically patterned substrate with well-defined Si3N4 features for graphoepitaxially alignment self-assembled patterns. Microphase-separated long-range ordered polystyrene-b-poly(ethylene oxide) (PS-b-PEO) block-copolymer-derived dot and line...
Abstract We report the development of a multifunctional, nanostructured tungsten oxide catalytic device using block copolymer (BCP) templating, which was utilised for both oxygen evolution reaction (OER) and epinephrine (EP) detection. The constructed by depositing self‐assembled BCP film atop an indium tin (ITO) substrate. A precursor then selectively coordinated into via liquid phase infiltration, upon UV‐ozone treatment yielded WO 3 surface nanolines (NLs) with excellent coverage....
Abstract Oxygen plasma treatments for conversion of metal salt infiltrated polymer films to oxide using an asymmetrical capacitively coupled system were investigated. Hydroxylated Poly-2-Vinylpyridine (P2VP-OH) thin grafted silicon exposed salt-solvent solutions which swell the enabling ion infiltration. Exposing resulting film oxygen resulted in formation polymer-free films. Atomic and positive ions present can both influence process outcome. A design experiment approach was used...
The proliferation of advanced portable technology places substantial demands on current patterning techniques to satisfy future device and data needs. Therefore, research integrating high-performing nanomaterials such as transition metal dichalcogenides (TMDs) with industry standard methods is critical achieving ultra-low-power devices. We describe based upon combining TMD materials bottom-up block copolymer (BCP) templating processes. While there has been much focus processing layered 2D...
Block co-polymers (BCPs) enable large-scale patterning with nanoscale feature sizes. With high molecular weight BCPs, features and periods in the range 50 nm to 150 can be achieved. This size lends itself sub-diffractive visible near-infrared optical components. In this work, BCPs are used form a triangular lattice on glass surface; is selectively infiltrated nickel oxide produce mask for plasma etching. The conical pillars formed by etching generate gradual change of refractive index thus...
Abstract A method for producing large-area, broadband, quasi-omnidirectional low-reflectivity glass surfaces is presented. Using block copolymer patterning and inductively coupled plasma etching, near-periodic arrays of pillars are formed in glass. The patterned surface has reflectivity <?CDATA $\lt$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo><</mml:mo> </mml:math> 0.5%—almost an order magnitude smaller than plain glass—with a bandwidth ∼300 nm....