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Graphene nanoribbons with hBN passivated edges grown by high-temperature molecular beam epitaxy (2023)
Journal Article
Bradford, J., Cheng, T. S., James, T. S., Khlobystov, A. N., Mellor, C. J., Watanabe, K., …Beton, P. H. (2023). Graphene nanoribbons with hBN passivated edges grown by high-temperature molecular beam epitaxy. 2D Materials, 10(3), Article 035035. https://doi.org/10.1088/2053-1583/acdefc

Integration of graphene and hexagonal boron nitride (hBN) in lateral heterostructures has provided a route to broadly engineer the material properties by quantum confinement of electrons or introduction of novel electronic and magnetic states at the... Read More about Graphene nanoribbons with hBN passivated edges grown by high-temperature molecular beam epitaxy.

Electroluminescence from a phthalocyanine monolayer encapsulated in a van der Waals tunnel diode (2023)
Journal Article
James, T., Bradford, J., Kerfoot, J., Korolkov, V. V., Alkhamisi, M., Taniguchi, T., …Beton, P. H. (2023). Electroluminescence from a phthalocyanine monolayer encapsulated in a van der Waals tunnel diode. Molecular Physics, 121(7-8), Article e2197081. https://doi.org/10.1080/00268976.2023.2197081

Monolayers of free base phthalocyanine (H2Pc) are grown on monolayer and few-layer exfoliated flakes of hexagonal boron nitride (hBN) which are subsequently integrated into a van der Waals tunnel diode. This heterostructure consists of two thin hBN f... Read More about Electroluminescence from a phthalocyanine monolayer encapsulated in a van der Waals tunnel diode.

Submolecular Resolution Imaging of P3HT:PCBM Nanostructured Films by Atomic Force Microscopy: Implications for Organic Solar Cells (2022)
Journal Article
Liirò-Peluso, L., Wrigley, J., Amabilino, D. B., & Beton, P. H. (2022). Submolecular Resolution Imaging of P3HT:PCBM Nanostructured Films by Atomic Force Microscopy: Implications for Organic Solar Cells. ACS Applied Nano Materials, 5(10), 13794-13804. https://doi.org/10.1021/acsanm.2c01399

The efficiency of organic bulk-heterojunction (BHJ) solar cells depends greatly on both the bulk and surface structure of the nanostructured bicontinuous interpenetrating network of materials, known as the active layer. The morphology of the top laye... Read More about Submolecular Resolution Imaging of P3HT:PCBM Nanostructured Films by Atomic Force Microscopy: Implications for Organic Solar Cells.

Natural optical activity as the origin of the large chiroptical properties in ?-conjugated polymer thin films (2020)
Journal Article
Wade, J., Hilfiker, J. N., Brandt, J. R., Liirò-Peluso, L., Wan, L., Shi, X., …Fuchter, M. J. (2020). Natural optical activity as the origin of the large chiroptical properties in π-conjugated polymer thin films. Nature Communications, 11(1), Article 6137. https://doi.org/10.1038/s41467-020-19951-y

Polymer thin films that emit and absorb circularly polarised light have been demonstrated with the promise of achieving important technological advances; from efficient, high-performance displays, to 3D imaging and all-organic spintronic devices. How... Read More about Natural optical activity as the origin of the large chiroptical properties in ?-conjugated polymer thin films.

Triplet Excitation and Electroluminescence from a Supramolecular Monolayer Embedded in a Boron Nitride Tunnel Barrier (2019)
Journal Article
Svatek, S. A., Kerfoot, J., Summerfield, A., Nizovtsev, A. S., Korolkov, V. V., Taniguchi, T., …Beton, P. H. (2020). Triplet Excitation and Electroluminescence from a Supramolecular Monolayer Embedded in a Boron Nitride Tunnel Barrier. Nano Letters, 20(1), 278-283. https://doi.org/10.1021/acs.nanolett.9b03787

© 2019 American Chemical Society. We show that ordered monolayers of organic molecules stabilized by hydrogen bonding on the surface of exfoliated few-layer hexagonal boron nitride (hBN) flakes may be incorporated into van der Waals heterostructures... Read More about Triplet Excitation and Electroluminescence from a Supramolecular Monolayer Embedded in a Boron Nitride Tunnel Barrier.

Epitaxial multilayers of alkanes on two-dimensional black phosphorus as passivating and electrically insulating nanostructures (2019)
Journal Article
Bolognesi, M., Brucale, M., Lorenzoni, A., Prescimone, F., Moschetto, S., Korolkov, V. V., …Toffanin, S. (2019). Epitaxial multilayers of alkanes on two-dimensional black phosphorus as passivating and electrically insulating nanostructures. Nanoscale, 11(37), 17252-17261. https://doi.org/10.1039/c9nr01155b

© The Royal Society of Chemistry. Mechanically exfoliated two-dimensional (2D) black phosphorus (bP) is epitaxially terminated by monolayers and multilayers of tetracosane, a linear alkane, to form a weakly interacting van der Waals heterostructure.... Read More about Epitaxial multilayers of alkanes on two-dimensional black phosphorus as passivating and electrically insulating nanostructures.

Ordering, Flexibility and Frustration in Arrays of Porphyrin Nanorings (2019)
Journal Article
Summerfield, A., Baldoni, M., Kondratuk, D. V., Anderson, H. L., Whitelam, S., Garrahan, J. P., …Beton, P. H. (2019). Ordering, Flexibility and Frustration in Arrays of Porphyrin Nanorings. Nature Communications, 10, Article 2932. https://doi.org/10.1038/s41467-019-11009-y

The regular packing of atoms, molecules and nanoparticles provides the basis for the understanding of structural order within condensed phases of matter. Typically the constituent particles are considered to be rigid with a fixed shape. Here we show,... Read More about Ordering, Flexibility and Frustration in Arrays of Porphyrin Nanorings.

Ultra-high resolution imaging of thin films and single strands of polythiophene using atomic force microscopy (2019)
Journal Article
Korolkov, V. V., Summerfield, A., Murphy, A., Amabilino, D. B., Watanabe, K., Taniguchi, T., & Beton, P. H. (2019). Ultra-high resolution imaging of thin films and single strands of polythiophene using atomic force microscopy. Nature Communications, 10, Article 1537. https://doi.org/10.1038/s41467-019-09571-6

Real-space images of polymers with sub-molecular resolution could provide valuable insights into the relationship between morphology and functionality of polymer optoelectronic devices, but their acquisition is problematic due to perceived limitation... Read More about Ultra-high resolution imaging of thin films and single strands of polythiophene using atomic force microscopy.

The growth and fluorescence of phthalocyanine monolayers, thin films and multilayers on hexagonal boron nitride (2018)
Journal Article
Alkhamisi, M., Korolkov, V. V., Nizovtsev, A. S., Kerfoot, J., Taniguchi, T., Watanabe, K., …Beton, P. H. (2018). The growth and fluorescence of phthalocyanine monolayers, thin films and multilayers on hexagonal boron nitride. Chemical Communications, 54(85), 12021-12024. https://doi.org/10.1039/C8CC06304D

Free-base phthalocyanine forms distinct interfacial phases and thin films on hexagonal boron nitride including a monolayer arrangement as determined using high resolution atomic force microscopy. The phases reveal significant differences in photolumi... Read More about The growth and fluorescence of phthalocyanine monolayers, thin films and multilayers on hexagonal boron nitride.

Substrate-induced shifts and screening in the fluorescence spectra of supramolecular adsorbed organic monolayers (2018)
Journal Article
Kerfoot, J., Korolkov, V. V., Nizovtsev, A. S., Jones, R., Taniguchi, T., Watanabe, K., …Beton, P. H. (2018). Substrate-induced shifts and screening in the fluorescence spectra of supramolecular adsorbed organic monolayers. Journal of Chemical Physics, 149(5), Article 054701. https://doi.org/10.1063/1.5041418

We have investigated the influence of the substrate on the fluorescence of adsorbed organic molecules. Monolayer films of perylene-3,4,9,10-tetracarboxylic-3,4,9,10-diimide (PTCDI), a supramolecular network formed from PTCDI and melamine, and perylen... Read More about Substrate-induced shifts and screening in the fluorescence spectra of supramolecular adsorbed organic monolayers.

High-temperature molecular beam epitaxy of hexagonal boron nitride with high active nitrogen fluxes (2018)
Journal Article
Cheng, T. S., Summerfield, A., Mellor, C. J., Khlobystov, A. N., Eaves, L., Foxon, C. T., …Novikov, S. V. (2018). High-temperature molecular beam epitaxy of hexagonal boron nitride with high active nitrogen fluxes. Materials, 11(7), https://doi.org/10.3390/ma11071119

Hexagonal boron nitride (hBN) has attracted much attention as a key component in van der Waals heterostructures and as a wide band gap material for deep-ultraviolet devices. We have recently demonstrated plasma-assisted molecular beam epitaxy (PA-MBE... Read More about High-temperature molecular beam epitaxy of hexagonal boron nitride with high active nitrogen fluxes.

High-temperature molecular beam epitaxy of hexagonal boron nitride layers (2018)
Journal Article
Cheng, T. S., Summerfield, A., Mellor, C. J., Davies, A., Khlobystov, A. N., Eaves, L., …Novikov, S. V. (in press). High-temperature molecular beam epitaxy of hexagonal boron nitride layers. Journal of Vacuum Science and Technology B, 36(2), Article 02D103-1. https://doi.org/10.1116/1.5011280

The growth and properties of hexagonal boron nitride (hBN) have recently attracted much attention due to applications in graphene-based monolayer thick 2D-structures and at the same time as a wide band gap material for deep-ultraviolet device (DUV) a... Read More about High-temperature molecular beam epitaxy of hexagonal boron nitride layers.

Lattice-Matched Epitaxial Graphene Grown on Boron Nitride (2017)
Journal Article
Davies, A., Albar, J., Summerfield, A., Thomas, J. C., Cheng, T. S., Korolkov, V. V., …Beton, P. H. (2018). Lattice-Matched Epitaxial Graphene Grown on Boron Nitride. Nano Letters, 18(1), 498-504. https://doi.org/10.1021/acs.nanolett.7b04453

Lattice-matched graphene on hexagonal boron nitride is expected to lead to the formation of a band-gap but requires the formation of highly strained material and has not hitherto been realised. We demonstrate that aligned, lattice-matched graphene ca... Read More about Lattice-Matched Epitaxial Graphene Grown on Boron Nitride.

Supramolecular networks stabilise and functionalise black phosphorus (2017)
Journal Article
Korolkov, V. V., Timokhin, I. G., Haubrichs, R., Smith, E. F., Yang, L., Yang, S., …Beton, P. H. (2017). Supramolecular networks stabilise and functionalise black phosphorus. Nature Communications, 8(1), Article 1385. https://doi.org/10.1038/s41467-017-01797-6

© 2017 The Author(s). The limited stability of the surface of black phosphorus (BP) under atmospheric conditions is a significant constraint on the exploitation of this layered material and its few layer analogue, phosphorene, as an optoelectronic ma... Read More about Supramolecular networks stabilise and functionalise black phosphorus.

Supramolecular heterostructures formed by sequential epitaxial deposition of two-dimensional hydrogen-bonded arrays (2017)
Journal Article
Korolkov, V. V., Baldoni, M., Watanabe, K., Taniguchi, T., Besley, E., & Beton, P. H. (2017). Supramolecular heterostructures formed by sequential epitaxial deposition of two-dimensional hydrogen-bonded arrays. Nature Chemistry, 9(12), 1191-1197. https://doi.org/10.1038/nchem.2824

© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Two-dimensional (2D) supramolecular arrays provide a route to the spatial control of the chemical functionality of a surface, but their deposition is in almost all cas... Read More about Supramolecular heterostructures formed by sequential epitaxial deposition of two-dimensional hydrogen-bonded arrays.

Hexagonal Boron Nitride Tunnel Barriers Grown on Graphite by High Temperature Molecular Beam Epitaxy (2016)
Journal Article
Cho, Y., Summerfield, A., Davies, A., Cheng, T. S., Smith, E. F., Mellor, C. J., …Novikov, S. V. (2016). Hexagonal Boron Nitride Tunnel Barriers Grown on Graphite by High Temperature Molecular Beam Epitaxy. Scientific Reports, 6(1), Article 34474. https://doi.org/10.1038/srep34474

We demonstrate direct epitaxial growth of high-quality hexagonal boron nitride (hBN) layers on graphite using high-temperature plasma-assisted molecular beam epitaxy. Atomic force microscopy reveals mono- and few-layer island growth, while conducting... Read More about Hexagonal Boron Nitride Tunnel Barriers Grown on Graphite by High Temperature Molecular Beam Epitaxy.

Quantum confinement and photoresponsivity of ?-In2Se3 nanosheets grown by physical vapour transport (2016)
Journal Article
Balakrishnan, N., Staddon, C. R., Smith, E. F., Stec, J., Gay, D., Mudd, G. W., …Beton, P. H. (in press). Quantum confinement and photoresponsivity of β-In2Se3 nanosheets grown by physical vapour transport. 2D Materials, 3(2), 1-8. https://doi.org/10.1088/2053-1583/3/2/025030

We demonstrate that β-In2Se3 layers with thickness ranging from 2.8 – 100 nm can be grown on SiO2/Si, mica and graphite using a physical vapour transport method. The β-In2Se3 layers are chemically stable at room temperature and exhibit a blue-shift o... Read More about Quantum confinement and photoresponsivity of ?-In2Se3 nanosheets grown by physical vapour transport.

Strain-Engineered Graphene Grown on Hexagonal Boron Nitride by Molecular Beam Epitaxy (2016)
Journal Article
Summerfield, A., Davies, A., Cheng, T. S., Korolkov, V. V., Cho, Y., Mellor, C. J., …Beton, P. H. (2016). Strain-Engineered Graphene Grown on Hexagonal Boron Nitride by Molecular Beam Epitaxy. Scientific Reports, 6(1), Article 22440. https://doi.org/10.1038/srep22440

Graphene grown by high temperature molecular beam epitaxy on hexagonal boron nitride (hBN) forms continuous domains with dimensions of order 20 μm, and exhibits moiré patterns with large periodicities, up to ~30 nm, indicating that the layers are hig... Read More about Strain-Engineered Graphene Grown on Hexagonal Boron Nitride by Molecular Beam Epitaxy.

Nucleation and Early Stages of Layer-by-Layer Growth of Metal Organic Frameworks on Surfaces (2015)
Journal Article
Summerfield, A., Cebula, I., Schröder, M., & Beton, P. H. (2015). Nucleation and Early Stages of Layer-by-Layer Growth of Metal Organic Frameworks on Surfaces. Journal of Physical Chemistry C, 119(41), 23544-23551. https://doi.org/10.1021/acs.jpcc.5b07133

High resolution atomic force microscopy (AFM) is used to resolve the evolution of crystallites of a metal organic framework (HKUST-1) grown on Au(111) using a liquid-phase layer-by-layer methodology. The nucleation and faceting of individual crystall... Read More about Nucleation and Early Stages of Layer-by-Layer Growth of Metal Organic Frameworks on Surfaces.

van der Waals-induced chromatic shifts in hydrogen-bonded two-dimensional porphyrin arrays on boron nitride (2015)
Journal Article
Korolkov, V. V., Svatek, S. A., Summerfield, A., Kerfoot, J., Yang, L., Taniguchi, T., …Beton, P. H. (2015). van der Waals-induced chromatic shifts in hydrogen-bonded two-dimensional porphyrin arrays on boron nitride. ACS Nano, 9(10), https://doi.org/10.1021/acsnano.5b04443

The fluorescence of a two-dimensional supramolecular network of 5,10,15,20-tetrakis(4-carboxylphenyl)porphyrin (TCPP) adsorbed on hexagonal boron nitride (hBN) is red shifted due to, primarily, adsorbate–substrate van der Waals interactions. TCPP is... Read More about van der Waals-induced chromatic shifts in hydrogen-bonded two-dimensional porphyrin arrays on boron nitride.