A5050216924- Molecular Junctions and Nanostructures
- Surface Chemistry and Catalysis
- Porphyrin and Phthalocyanine Chemistry
- Electron and X-Ray Spectroscopy Techniques
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Graphene research and applications
- Fullerene Chemistry and Applications
- X-ray Diffraction in Crystallography
- Surface and Thin Film Phenomena
- Crystallization and Solubility Studies
- Quantum Dots Synthesis And Properties
- Advanced Chemical Physics Studies
- Electrochemical Analysis and Applications
- Electronic and Structural Properties of Oxides
- X-ray Spectroscopy and Fluorescence Analysis
- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- Advancements in Battery Materials
- Photosynthetic Processes and Mechanisms
- Ion-surface interactions and analysis
- Semiconductor materials and devices
- Electrohydrodynamics and Fluid Dynamics
- Diamond and Carbon-based Materials Research
- Copper-based nanomaterials and applications
University of Nottingham
2016-2025
Universidad de La Laguna
2023
Uppsala University
2000-2007
Lund University
2007
Cardiff University
1999-2001
University College Cork
1977
Abstract Graphene nanoribbons (GNRs), nanometre-wide strips of graphene, are promising materials for fabricating electronic devices. Many GNRs have been reported, yet no scalable strategies known synthesizing with metal atoms and heteroaromatic units at precisely defined positions in the conjugated backbone, which would be valuable tuning their optical, magnetic properties. Here we report solution-phase synthesis a porphyrin-fused graphene nanoribbon (PGNR). This PGNR has metalloporphyrins...
Many hands make light work: Small templates working together have directed the formation of a giant π-conjugated macrocycle with diameter 10 nm—larger than many enzymes. The 24 porphyrin subunits nanoring are well resolved in STM image. conformation can be controlled by self-assembly stable 2:24 double-strand sandwich complex 1,4-diazabicyclo[2.2.2]octane (DABCO). Detailed facts importance to specialist readers published as "Supporting Information". Such documents peer-reviewed, but not...
We have investigated the ordered phases of perylene derivatives perylene-3,4,9,10-tetracarboxylic-3,4,9,10-dianhydride (PTCDA) and imide analogue PTCDI on Ag-Si(111)square root(3) x square root(3)R30 degrees surface using scanning tunneling microscopy. find that PTCDA forms square, hexagonal, herringbone phases, which coexist surface. The existence a phase hexagonal is particular interest result near commensurability between molecular dimensions lattice. Contrast variations across islands...
An experimental study of the bonding geometry and electronic coupling cis-bis(isothiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylato)-ruthenium(II) (N3) adsorbed on rutile TiO2(110) is presented, along with supporting theoretical calculations geometry. Samples were prepared in situ using ultrahigh vacuum electrospray deposition. Core-level photoemission spectroscopy was used to characterize system deduce nature molecule-surface bonding. Valence band N 1s x-ray absorption spectra aligned a...
Vernier templating exploits a mismatch between the number of binding sites in template and reactant to direct formation product that is large enough bind several units. Here, we present detailed study Vernier-templated synthesis 12-porphyrin nanoring. NMR small-angle X-ray scattering (SAXS) analyses show complexes are formed as intermediates cyclo-oligomerization reaction. UV/Vis/NIR titrations three-component assembly nanoring figure-of-eight complex displays high allosteric cooperativity...
Rings of porphyrins mimic natural light-harvesting chlorophyll arrays and offer insights into electronic delocalization, providing a motivation for creating larger nanorings with closely spaced porphyrin units. Here, we demonstrate the first synthesis macrocycle consisting entirely 5,15-linked porphyrins. This octadecamer was constructed using covalent six-armed template, made by cobalt-catalyzed cyclotrimerization an H-shaped tolan trimer ends. The around circumference nanoring were linked...
Metal-based additive manufacturing (AM) represents a paradigm change in engineering and production methods across multiple industries sectors. AM enable mass reduction performance optimisation well beyond that achievable via conventional manufacturing, thereby impacting significantly on aerospace space technologies. Technologies relying high ultra-high vacuum (UHV), such as x-ray photo-electron spectroscopy, photo-sensors, cameras cryostats, could also benefit greatly from AM. Despite recent...
Lithium iron phosphate (LiFePO4, LFP) is the most promising cathode material for use in safe electric vehicles (EVs), due to its long cycle stability, low cost, and toxicity, but it suffers from conductivity ion diffusion. In this work, we present a simple method obtain LFP/carbon (LFP/C) composites with different types of NC: cellulose nanocrystal (CNC) nanofiber (CNF). Microwave-assisted hydrothermal synthesis was used LFP nanocellulose inside vessel, final LFP/C composite achieved by...
Electrospray deposition of fullerenes on gold has been successfully observed by in situ room temperature scanning tunneling microscopy and photoemission spectroscopy. Step-edge decoration hexagonal close-packed islands with a periodicity 1 nm are at low multilayer coverages respectively, agreement thermal evaporation studies. Photoemission spectroscopy shows that being deposited high purity coupling to the surface as for evaporation. These results open new route thermally labile molecules...
Zinc-protoporphyrin, adsorbed on the rutile TiO2(110) surface, has been studied using photoemission spectroscopy and near-edge absorption fine structure to deduce nature of molecule-surface bonding chemical environment central metal atom. To overcome difficulties associated with sublimation porphyrin molecules, samples were prepared in situ ultrahigh vacuum electrospray deposition, a technique which facilitates deposition nonvolatile fragile molecules. Monolayers Zn protoporphyrin are found...
Molecular worms: Porphyrin polymers and oligomers are deposited on a Au(111) surface using electrospray deposition shown to adopt an arrangement where chains from neighboring molecules interdigitated. Although the flexible nature of gives rise sharp kinks crossing polymer strands (see scheme), longer correlation length as compared with solvated is observed. Detailed facts importance specialist readers published ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or...
An electrospray technique has been successfully used to deposit C60 onto a hydrogen-bonded supramolecular template held in an ultrahigh vacuum environment. Characterization of the surface by situ scanning tunneling microscopy shows size-selective trapping dimers and heptamers within 3,4,9,10-perylene tetracarboxylic diimide (PTCDI)/melamine network. We demonstrate that deposition (UHV-ESD), where energetic molecules impact substrate, is compatible with surfaces which have functionalized...
Solvent-induced aggregates of nanoring cyclic polymers may be transferred by electrospray deposition to a surface where they adsorb as three-dimensional columnar stacks. The observed stack height varies from single rings four stacked with layer spacing 0.32 ± 0.04 nm measured using scanning tunneling microscopy. flexibility the nanorings results in distortions circular shape, and we show, through comparison Monte Carlo simulations, that bending stiffness increases linearly height. Our show...
The study of electron delocalisation in oxygen atom segregated zones graphene, aided by the first-principles density functional theory, has revealed extra energy bands ≥2 eV wide around Fermi level, predicting Faradaic charge storage occurring a range potentials, which disagrees with Nernst's law but accounts well for so called pseudocapacitance heteroatom-modified graphene based electrode materials supercapacitors.
Ultra-thin aluminium oxide was grown on a rutile titanium dioxide surface by atomic layer deposition using trimethylaluminium and water precursors. This process, carried out realistic temperatures pressures (1 mbar, 450 K), monitored in situ near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS). provides insight into the chemistry at interface between two layers - specifically reduction of atoms from Ti4+ to Ti3+ upon dosing trimethylaluminium. These defect states become locked...
Despite important advances in the synthesis of inorganic perovskite nanocrystals (NCs), long-term instability and degradation their quantum yield (QY) over time need to be addressed enable further development exploitation these nanomaterials. Here we report stable CsPbI3 NCs use hybrid light emitting diodes (LEDs), which combine one system a blue GaN-based LED. Nanocrystals with improved morphological optical properties are obtained by optimizing post-synthesis replacement oleic acid ligands...
Phosphine oxide-decorated polymer immobilized ionic liquid stabilized RuNPs catalyse the hydrogenation of aryl ketones with remarkable selectivity for CO bond, complete to cyclohexylalcohol and levulinic acid γ-valerolactone.