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  1. Article ; Online: High-performance p-type V

    Ainabayev, Ardak / Walls, Brian / Mullarkey, Daragh / Caffrey, David / Fleischer, Karsten / Smith, Christopher M / McGlinchey, Amy / Casey, Daniel / McCormack, Sarah J / Shvets, Igor

    Scientific reports

    2024  Volume 14, Issue 1, Page(s) 1928

    Abstract: High-quality epitaxial p-type ... ...

    Abstract High-quality epitaxial p-type V
    Language English
    Publishing date 2024-01-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-024-52024-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: The influence of drinking water constituents on the level of microplastic release from plastic kettles

    Shi, Yunhong / Li, Dunzhu / Xiao, Liwen / Sheerin, Emmet D. / Mullarkey, Daragh / Yang, Luming / Bai, Xue / Shvets, Igor V. / Boland, John J. / Wang, Jing Jing

    Journal of hazardous materials. 2022 Mar. 05, v. 425

    2022  

    Abstract: Microplastic (MP) release from household plastic products has become a global concern due to the high recorded levels of microplastic and the direct risk of human exposure. However, the most widely used MP measurement protocol, which involves the use of ... ...

    Abstract Microplastic (MP) release from household plastic products has become a global concern due to the high recorded levels of microplastic and the direct risk of human exposure. However, the most widely used MP measurement protocol, which involves the use of deionized (DI) water, fails to account for the ions and particles present in real drinking water. In this paper, the influence of typical ions (Ca²⁺/HCO₃⁻, Fe³⁺, Cu²⁺) and particles (Fe₂O₃ particles) on MP release was systematically investigated by conducting a 100-day study using plastic kettles. Surprisingly, after 40 days, all ions resulted in a greater than 89.0% reduction in MP release while Fe₂O₃ particles showed no significant effect compared to the DI water control. The MP reduction efficiency ranking is Fe³⁺ ≈ Cu²⁺ > Ca²⁺/HCO₃⁻ > > Fe₂O₃ particles ≈ DI water. Physical and chemical characterization using SEM-EDX, AFM, XPS and Raman spectroscopy confirmed Ca²⁺/HCO₃⁻, Cu²⁺ and Fe³⁺ ions are transformed into passivating films of CaCO₃, CuO, and Fe₂O₃, respectively, which are barriers to MP release. In contrast, there was no film formed when the plastic was exposed to Fe₂O₃ particles. Studies also confirmed that films with different chemical compositions form naturally in kettles during real life due to the different ions present in local regional water supplies. All films identified in this study can substantially reduce the levels of MP release while withstanding the repeated adverse conditions associated with daily use. This study underscores the potential for regional variations in human MP exposure due to the substantial impact water constituents have on the formation of passivating film formation and the subsequent release of MPs.
    Keywords Raman spectroscopy ; humans ; microplastics ; risk
    Language English
    Dates of publication 2022-0305
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2021.127997
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: VO

    Walls, Brian / Murtagh, Oisín / Bozhko, Sergey I / Ionov, Andrei / Mazilkin, Andrey A / Mullarkey, Daragh / Zhussupbekova, Ainur / Shulyatev, Dmitry A / Zhussupbekov, Kuanysh / Andreev, Nikolai / Tabachkova, Nataliya / Shvets, Igor V

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 21

    Abstract: The strongly correlated electron material, vanadium dioxide (VO2), has seen considerable attention and research application in metal-oxide electronics due to its metal-to-insulator transition close to room temperature. Vacuum annealing a V2O5(010) single ...

    Abstract The strongly correlated electron material, vanadium dioxide (VO2), has seen considerable attention and research application in metal-oxide electronics due to its metal-to-insulator transition close to room temperature. Vacuum annealing a V2O5(010) single crystal results in Wadsley phases (VnO2n+1, n > 1) and VO2. The resistance changes by a factor of 20 at 342 K, corresponding to the metal-to-insulator phase transition of VO2. Macroscopic voltage-current measurements with a probe separation on the millimetre scale result in Joule heating-induced resistive switching at extremely low voltages of under a volt. This can reduce the hysteresis and facilitate low temperature operation of VO2 devices, of potential benefit for switching speed and device stability. This is correlated to the low resistance of the system at temperatures below the transition. High-resolution transmission electron microscopy measurements reveal a complex structural relationship between V2O5, VO2 and V6O13 crystallites. Percolation paths incorporating both VO2 and metallic V6O13 are revealed, which can reduce the resistance below the transition and result in exceptionally low voltage resistive switching.
    Language English
    Publishing date 2022-10-31
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15217652
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Quantifying the Performance of P-Type Transparent Conducting Oxides by Experimental Methods.

    Fleischer, Karsten / Norton, Emma / Mullarkey, Daragh / Caffrey, David / Shvets, Igor V

    Materials (Basel, Switzerland)

    2017  Volume 10, Issue 9

    Abstract: Screening for potential new materials with experimental and theoretical methods has led to the discovery of many promising candidate materials for p-type transparent conducting oxides. It is difficult to reliably assess a good p-type transparent ... ...

    Abstract Screening for potential new materials with experimental and theoretical methods has led to the discovery of many promising candidate materials for p-type transparent conducting oxides. It is difficult to reliably assess a good p-type transparent conducting oxide (TCO) from limited information available at an early experimental stage. In this paper we discuss the influence of sample thickness on simple transmission measurements and how the sample thickness can skew the commonly used figure of merit of TCOs and their estimated band gap. We discuss this using copper-deficient CuCrO 2 as an example, as it was already shown to be a good p-type TCO grown at low temperatures. We outline a modified figure of merit reducing thickness-dependent errors, as well as how modern ab initio screening methods can be used to augment experimental methods to assess new materials for potential applications as p-type TCOs, p-channel transparent thin film transistors, and selective contacts in solar cells.
    Language English
    Publishing date 2017-09-01
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma10091019
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: The influence of drinking water constituents on the level of microplastic release from plastic kettles.

    Shi, Yunhong / Li, Dunzhu / Xiao, Liwen / Sheerin, Emmet D / Mullarkey, Daragh / Yang, Luming / Bai, Xue / Shvets, Igor V / Boland, John J / Wang, Jing Jing

    Journal of hazardous materials

    2021  Volume 425, Page(s) 127997

    Abstract: Microplastic (MP) release from household plastic products has become a global concern due to the high recorded levels of microplastic and the direct risk of human exposure. However, the most widely used MP measurement protocol, which involves the use of ... ...

    Abstract Microplastic (MP) release from household plastic products has become a global concern due to the high recorded levels of microplastic and the direct risk of human exposure. However, the most widely used MP measurement protocol, which involves the use of deionized (DI) water, fails to account for the ions and particles present in real drinking water. In this paper, the influence of typical ions (Ca
    MeSH term(s) Drinking Water ; Environmental Monitoring ; Humans ; Microplastics ; Plastics ; Water Pollutants, Chemical/analysis
    Chemical Substances Drinking Water ; Microplastics ; Plastics ; Water Pollutants, Chemical
    Language English
    Publishing date 2021-12-06
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2021.127997
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

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  6. Article ; Online: Low-temperature synthesis and electrocatalytic application of large-area PtTe

    Mc Manus, John B / Horvath, Dominik V / Browne, Michelle P / Cullen, Conor P / Cunningham, Graeme / Hallam, Toby / Zhussupbekov, Kuanysh / Mullarkey, Daragh / Coileáin, Cormac Ó / Shvets, Igor V / Pumera, Martin / Duesberg, Georg S / McEvoy, Niall

    Nanotechnology

    2020  Volume 31, Issue 37, Page(s) 375601

    Abstract: The synthesis of transition metal dichalcogenides (TMDs) has been a primary focus for 2D nanomaterial research over the last 10 years, however, only a small fraction of this research has been concentrated on transition metal ditellurides. In particular, ... ...

    Abstract The synthesis of transition metal dichalcogenides (TMDs) has been a primary focus for 2D nanomaterial research over the last 10 years, however, only a small fraction of this research has been concentrated on transition metal ditellurides. In particular, nanoscale platinum ditelluride (PtTe
    Language English
    Publishing date 2020-06-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/ab9973
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Book ; Online: Synthesis of WTe2 thin films and highly-crystalline nanobelts from pre-deposited reactants

    Manus, John B. Mc / Ilhan, Cansu / Balsamo, Bastien / Downing, Clive / Cullen, Conor P. / Stimpfel-Lidner, Tanja / Cunningham, Graeme / Peters, Lisanne / Jones, Lewys / Mullarkey, Daragh / Shvets, Igor V. / Duesberg, Georg S. / McEvoy, Niall

    2020  

    Abstract: Tungsten ditelluride is a layered transition metal dichalcogenide (TMD) that has attracted increasing research interest in recent years. WTe2 has demonstrated large non-saturating magnetoresistance, potential for spintronic applications and promise as a ... ...

    Abstract Tungsten ditelluride is a layered transition metal dichalcogenide (TMD) that has attracted increasing research interest in recent years. WTe2 has demonstrated large non-saturating magnetoresistance, potential for spintronic applications and promise as a type-II Weyl semimetal. The majority of works on WTe2 have relied on mechanically-exfoliated flakes from chemical vapour transport (CVT) grown crystals for their investigations. While producing high-quality samples, this method is hindered by several disadvantages including long synthesis times, high-temperature anneals and an inherent lack of scalability. In this work, a synthesis method is demonstrated that allows the production of large-area polycrystalline films of WTe2. This is achieved by the reaction of pre-deposited films of W and Te at a relatively low temperature of 550 degC. Sputter X-ray photoelectron spectroscopy reveals the rapid but self-limiting nature of the oxidation of these WTe2 films in ambient conditions. The WTe2 films are composed of areas of micrometre sized nanobelts that can be isolated and offer potential as an alternative to CVT-grown samples. These nanobelts are highly crystalline with low defect densities indicated by TEM and show promising initial electrical results.
    Keywords Condensed Matter - Materials Science
    Subject code 620
    Publishing date 2020-04-24
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Book ; Online: Low-temperature synthesis and electrocatalytic application of large-area PtTe2 thin films

    Manus, John B. Mc / Horvath, Dominik V. / Browne, Michelle P. / Cullen, Conor P. / Cunningham, Graeme / Hallam, Toby / Zhussupbekov, Kuanysh / Mullarkey, Daragh / Coileáin, Cormac Ó / Shvets, Igor V. / Pumera, Martin / Duesberg, Georg S. / McEvoy, Niall

    2020  

    Abstract: The synthesis of transition metal dichalcogenides (TMDs) has been a primary focus for 2D nanomaterial research over the last 10 years, however, only a small fraction of this research has been concentrated on transition metal ditellurides. In particular, ... ...

    Abstract The synthesis of transition metal dichalcogenides (TMDs) has been a primary focus for 2D nanomaterial research over the last 10 years, however, only a small fraction of this research has been concentrated on transition metal ditellurides. In particular, nanoscale platinum ditelluride (PtTe2) has rarely been investigated, despite its potential applications in catalysis, photonics and spintronics. Of the reports published, the majority examine mechanically-exfoliated flakes from chemical vapor transport (CVT) grown crystals. While this production method is ideal for fundamental studies, it is very resource intensive therefore rendering this process unsuitable for large scale applications. In this report, the synthesis of thin films of PtTe2 through the reaction of solid-phase precursor films is described. This offers a production method for large-area, thickness-controlled PtTe2, suitable for a range of applications. These polycrystalline PtTe2 films were grown at temperatures as low as 450 degC, significantly below the typical temperatures used in the CVT synthesis methods. To investigate their potential applicability, these films were examined as electrocatalysts for the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). The films showed promising catalytic behavior, however, the PtTe2 was found to undergo chemical transformation to a substoichiometric chalcogenide compound under ORR conditions. This study shows while PtTe2 is stable and highly useful for HER, this property does not apply to ORR, which undergoes a fundamentally different mechanism. This study broadens our knowledge of the electrocatalysis of TMDs.
    Keywords Condensed Matter - Materials Science
    Subject code 540
    Publishing date 2020-04-07
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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