Browsing by Author "Summerfield, Alex"
Now showing items 1-8 of 8
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Direct band-gap crossover in epitaxial monolayer boron nitride
Beton, Peter (The University of Nottingham, 2019-06-28)Hexagonal boron nitride is a large band-gap insulating material which complements the electronic and optical properties of graphene and the transition metal dichalcogenides. However, the intrinsic optical properties of ... -
Moiré-modulated conductance of hexagonal boron nitride tunnel barriers
Summerfield, Alex (The University of Nottingham, 2018-07-16)Monolayer hexagonal boron nitride (hBN) tunnel barriers investigated using conductive atomic force microscopy reveal moiré patterns in the spatial maps of their tunnel conductance consistent with the formation of a moiré ... -
The nucleation and early stages of layer-by-layer growth of metal organic frameworks on surfaces
Beton, Peter (University of Nottingham, 2015-09-14)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 ... -
Ordering, flexibility and frustration in arrays of porphyrin nanorings
Beton, Peter (The University of Nottingham, 2020-04-01)The two-dimensional packing of cyclic porphyrin polymers, ‘nanorings’, on a graphite surface shows a rich and complex behaviour due to their internal symmetry and flexibility. Depending on the number of porphyrin groups ... -
Step-flow growth of graphene-boron nitride lateral heterostructures by molecular beam epitaxy
Beton, Peter (The University of Nottingham, 2020-04-20)Integration of graphene and hexagonal boron nitride (hBN) into lateral heterostructures has drawn focus due to the ability to broadly engineer the material properties. Hybrid monolayers with tuneable bandgaps have been ... -
Triplet excitation and electroluminescence from a supramolecular monolayer embedded in a boron nitride tunnel barrier
Beton, Peter (The University of Nottingham, 2019-12-10)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 with ... -
Ultra-high resolution imaging of thin films and single strands of polythiophene using atomic force microscopy
Beton, Peter (The University of Nottingham, 2019-04-05)Images and related analysis relevant to this research publication. -
Van der Waals-induced chromatic shifts in hydrogen-bonded two-dimensional porphyrin arrays on boron nitride
Beton, Peter (University of Nottingham, 2015-10-01)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 redshifted due to, primarily, adsorbate-substrate van der ...