Niall McEvoy

Trinity College Dublin

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Jonathan N. Coleman

Trinity College Dublin

Valeria Nicolosi

Advanced Materials and BioEngineering Research

Georg S. Duesberg

Universität der Bundeswehr München

Sang‐Hoon Park

Eulji University

Damien Hanlon

Trinity College Dublin

Chuanfang Zhang

Shandong Jiaotong University

Nina C. Berner

Advanced Materials and BioEngineering Research

Andrés Seral‐Ascaso

Universidad de Zaragoza

Maria O’Brien

Henry Royce Institute

Conor S. Boland

University of Sussex

Cooperative Institutions

Trinity College Dublin

Advanced Materials and BioEngineering Research

22q11 Ireland

University College Dublin

Chinese Academy of Sciences

Friedrich-Alexander-Universität Erlangen-Nürnberg

University of Siegen

Universität der Bundeswehr München

Centre National de la Recherche Scientifique

Shanghai Institute of Optics and Fine Mechanics

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Extra lithium-ion storage capacity enabled by liquid-phase exfoliated indium selenide nanosheets conductive network

Energy & Environmental Science (2020)

Chuanfang Zhang Meiying Liang Sang‐Hoon Park Zifeng Lin Andrés Seral‐Ascaso

FL-InSe/SWCNT flexible electrode exhibits much higher capacity than the theoretical capacity of InSe, which is attributed to the alloying of continuously formed In nanoclusters, the latter also provide additional adsorption capacity.

Selenide

Nanoclusters

10.1039/d0ee01052a

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Citations (40)

Heterojunction Hybrid Devices from Vapor Phase Grown MoS2

Scientific Reports (2014)

Chanyoung Yim Maria O’Brien Niall McEvoy Sarah Riazimehr Heiko Schäfer-Eberwein

We investigate a vertically-stacked hybrid photodiode consisting of a thin n-type molybdenum disulfide (MoS2) layer transferred onto p-type silicon. The fabrication is scalable as the MoS2 is grown by a controlled and tunable vapor phase sulfurization process. The obtained large-scale p-n heterojunction diodes exhibit notable photoconductivity which can be tuned by modifying the thickness of the MoS2 layer. The diodes have a broad spectral response due to direct and indirect band transitions of the nanoscale MoS2. Further, we observe a blue-shift of the spectral response into the visible range. The results are a significant step towards scalable fabrication of vertical devices from two-dimensional materials and constitute a new paradigm for materials engineering.

Molybdenum disulfide

Photodiode

Photoconductivity

10.1038/srep05458

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Citations (89)

Edge and confinement effects allow in situ measurement of size and thickness of liquid-exfoliated nanosheets

Nature Communications (2014)

Claudia Backes Ronan J. Smith Niall McEvoy Nina C. Berner David McCloskey

Exfoliation joint

Nanomaterials

Nanosheet

Extinction (optical mineralogy)

Molar absorptivity

10.1038/ncomms5576

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Citations (488)

Rapid high-resolution U–Pb LA-Q-ICPMS age mapping of zircon

Journal of Analytical Atomic Spectrometry (2017)

David Chew Joseph A. Petrus Gavin G. Kenny Niall McEvoy

²⁰⁶Pb–²³⁸U LA-ICPMS image map of a complex, polyphase zircon produced using 7 micron rasters.

10.1039/c6ja00404k

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Citations (23)

Liquid exfoliation of interlayer spacing-tunable 2D vanadium oxide nanosheets: High capacity and rate handling Li-ion battery cathodes

Nano Energy (2017)

Chuanfang Zhang Sang‐Hoon Park Sean O’Brien Andrés Seral‐Ascaso Meiying Liang

Pentoxide

Exfoliation joint

Nanosheet

Vanadium Oxide

10.1016/j.nanoen.2017.06.044

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Citations (124)

Liquid exfoliation of solvent-stabilized few-layer black phosphorus for applications beyond electronics

Nature Communications (2015)

Damien Hanlon Claudia Backes Evie Doherty Clotilde S. Cucinotta Nina C. Berner

Few layer black phosphorus is a new two-dimensional material which is of great interest for applications, mainly in electronics. However, its lack of stability severely limits our ability to synthesise and process this material. Here we demonstrate that high-quality, few-layer black phosphorus nanosheets can be produced in large quantities by liquid phase exfoliation in the solvent N-cyclohexyl-2-pyrrolidone (CHP). We can control nanosheet dimensions and have developed metrics to estimate both nanosheet size and thickness spectroscopically. When exfoliated in CHP, the nanosheets are remarkably stable unless water is intentionally introduced. Computational studies show the degradation to occur by reaction with water molecules only at the nanosheet edge, leading to the removal of phosphorus atoms and the formation of phosphine and phosphorous acid. We demonstrate that liquid exfoliated black phosphorus nanosheets are potentially useful in a range of applications from optical switches to gas sensors to fillers for composite reinforcement.

Exfoliation joint

Nanosheet

Black Phosphorus

Nanomaterials

10.1038/ncomms9563

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Citations (1,020)

Lithium Titanate/Carbon Nanotubes Composites Processed by Ultrasound Irradiation as Anodes for Lithium Ion Batteries

Scientific Reports (2017)

João Coelho Anuj Pokle Sang‐Hoon Park Niall McEvoy Nina C. Berner

Abstract In this work, lithium titanate nanoparticles (nLTO)/single wall carbon nanotubes (SWCNT) composite electrodes are prepared by the combination of an ultrasound irradiation and ultrasonic spray deposition methods. It was found that a mass fraction of 15% carbon nanotubes optimizes the electrochemical performance of nLTO electrodes. These present capacities as high as 173, 130, 110 and 70 mAh.g −1 at 0.1C, 1C, 10C and 100C, respectively. Moreover, after 1000 cycles at 1C, the nLTO/SWCNT composites present a capacity loss of just 9% and a Coulombic efficiency of 99.8%. Therefore, the presented methodology might be extended to other suitable active materials in order to manufacture binder free electrodes with optimal energy storage capabilities.

Lithium titanate

Carbon fibers

Electrophoretic Deposition

Mass fraction

10.1038/s41598-017-06908-3

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Citations (20)

Additive-free MXene inks and direct printing of micro-supercapacitors

Nature Communications (2019)

Chuanfang Zhang Lorcan McKeon Matthias P. Kremer Sang‐Hoon Park Oskar Ronan

Abstract Direct printing of functional inks is critical for applications in diverse areas including electrochemical energy storage, smart electronics and healthcare. However, the available printable ink formulations are far from ideal. Either surfactants/additives are typically involved or the ink concentration is low, which add complexity to the manufacturing and compromises the printing resolution. Here, we demonstrate two types of two-dimensional titanium carbide (Ti 3 C 2 T x ) MXene inks, aqueous and organic in the absence of any additive or binary-solvent systems, for extrusion printing and inkjet printing, respectively. We show examples of all-MXene-printed structures, such as micro-supercapacitors, conductive tracks and ohmic resistors on untreated plastic and paper substrates, with high printing resolution and spatial uniformity. The volumetric capacitance and energy density of the all-MXene-printed micro-supercapacitors are orders of magnitude greater than existing inkjet/extrusion-printed active materials. The versatile direct-ink-printing technique highlights the promise of additive-free MXene inks for scalable fabrication of easy-to-integrate components of printable electronics.

Printed Electronics

Screen printing

Conductive ink

10.1038/s41467-019-09398-1

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Citations (856)

Mapping of Low-Frequency Raman Modes in CVD-Grown Transition Metal Dichalcogenides: Layer Number, Stacking Orientation and Resonant Effects

Scientific Reports (2016)

Maria O’Brien Niall McEvoy Damien Hanlon Toby Hallam Jonathan N. Coleman

Abstract Layered inorganic materials, such as the transition metal dichalcogenides (TMDs), have attracted much attention due to their exceptional electronic and optical properties. Reliable synthesis and characterization of these materials must be developed if these properties are to be exploited. Herein, we present low-frequency Raman analysis of MoS 2 , MoSe 2, WSe 2 and WS 2 grown by chemical vapour deposition (CVD). Raman spectra are acquired over large areas allowing changes in the position and intensity of the shear and layer-breathing modes to be visualized in maps. This allows detailed characterization of mono- and few-layered TMDs which is complementary to well-established (high-frequency) Raman and photoluminescence spectroscopy. This study presents a major stepping stone in fundamental understanding of layered materials as mapping the low-frequency modes allows the quality, symmetry, stacking configuration and layer number of 2D materials to be probed over large areas. In addition, we report on anomalous resonance effects in the low-frequency region of the WS 2 Raman spectrum.

Characterization

10.1038/srep19476

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Citations (91)

Growth of 1T′ MoTe₂ by Thermally Assisted Conversion of Electrodeposited Tellurium Films

ACS Applied Energy Materials (2018)

John B. McManus G.W. Cunningham Niall McEvoy Conor P. Cullen Farzan Gity

Molybdenum ditelluride (MoTe2) is a transition metal dichalcogenide (TMD) which has two phases stable under ambient conditions, a semiconducting (2H) and semimetallic (1T′) phase. Despite a host of interesting properties and potential applications, MoTe2 is one of the less-studied TMDs, perhaps due its relatively low abundance in nature or challenges associated with its synthesis, such as the toxicity of most precursors. In this report, we describe the fabrication of thin films of phase-pure 1T′ MoTe2 using predeposited molybdenum and electrodeposited tellurium layers, at the relatively low temperature of 450 °C. This method allows control over film geometry and over the tellurium concentration during the conversion. The MoTe2 films are characterized by Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, atomic force microscopy, and electron microscopies. When applied as a catalyst for the hydrogen evolution reaction, the films display promising initial results. The MoTe2 films have a Tafel slope of below 70 mV dec–1 and compare favorably with other MoTe2 catalysts reported in the literature, especially considering the inherently scalable fabrication method. The variation in electrocatalytic behavior with thickness and morphology of the films is also investigated.

Tellurium

10.1021/acsaem.8b01540

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Citations (35)