A5040807764- Organic and Molecular Conductors Research
- Conducting polymers and applications
- Porphyrin and Phthalocyanine Chemistry
- Molecular Sensors and Ion Detection
- Crystallography and molecular interactions
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Supramolecular Chemistry and Complexes
- Organic Electronics and Photovoltaics
- Molecular Junctions and Nanostructures
- Luminescence and Fluorescent Materials
- Magnetism in coordination complexes
- Supramolecular Self-Assembly in Materials
- Photochromic and Fluorescence Chemistry
- Perovskite Materials and Applications
- Photochemistry and Electron Transfer Studies
- Advanced Polymer Synthesis and Characterization
- Organic Light-Emitting Diodes Research
- Chemical Synthesis and Analysis
- Electrochemical Analysis and Applications
- TiO2 Photocatalysis and Solar Cells
- Ferrocene Chemistry and Applications
- Quantum Dots Synthesis And Properties
- Analytical Chemistry and Sensors
- Gold and Silver Nanoparticles Synthesis and Applications
University of Glasgow
2016-2025
Glasgow Life
2014-2021
Fraunhofer Centre for Applied Photonics
2015
École Nationale Supérieure de Chimie de Lille
2014
Unité Matériaux et Transformations
2014
Université Lille Nord de France
2014
Centre National de la Recherche Scientifique
2010-2014
Ghent University
2014
University of Massachusetts Amherst
1997-2012
Durham University
1990-2010
Abstract The morphology of bulk heterojunction organic photovoltaic cells controls many the performance characteristics devices. However, measuring this is challenging because small length-scales and low contrast between materials. Here we use nanoscale photocurrent mapping, ultrafast fluorescence exciton diffusion to observe detailed a high-performance blend PTB7:PC 71 BM. We show that optimized blends consist elongated fullerene-rich polymer-rich fibre-like domains, which are 10–50 nm wide...
Optical spectroscopic methods do not routinely provide information on higher order hierarchical structure (tertiary/quaternary) of biological macromolecules and assemblies. This necessitates the use time-consuming material intensive techniques, such as protein crystallography, NMR, electron microscopy. Here we demonstrate a phenomenon, superchiral polarimetry, which can rapidly characterize ligand-induced changes in at picogram level, is undetectable using conventional CD spectroscopy....
Development of low-cost disposable plasmonic substrates is vital for the applicability sensing. Such devices can be made using injection-molded templates to create films. The elements these films are hybrid nanostructures composed inverse and solid structures. Tuning modal coupling between two allows optimization optical properties nanophotonic applications. Artificially engineered metamaterials manipulate light in unique ways affording new opportunities optics spectroscopic detection...
Good selective contacts are necessary for solar cells that efficient and have long-term stability. Since 1998, with the advent of solid-state dye sensitized (DSSC), Spiro-OMeTAD has become reference hole-transporting material. Yet, must be partially oxidized chemical dopants, which compromises stability cell. Alternatively, semiconductor polymers such as PTAA been also studied, matching or improving cell characteristics. However, PTAA-based devices lack Moreover, both expensive materials to...
Abstract Photovoltaics (PVs) are a critical technology for curbing growing levels of anthropogenic greenhouse gas emissions, and meeting increases in future demand low-carbon electricity. In order to fulfill ambitions net-zero carbon dioxide equivalent (CO 2 eq) emissions worldwide, the global cumulative capacity solar PVs must increase by an magnitude from 0.9 TW p 2021 8.5 2050 according International Renewable Energy Agency, which is considered be highly conservative estimate. 2020, Henry...
In this article, we report the formation of micelles from a tetrathiafulvalene (TTF) end-functionalized poly(N-isopropylacrylamide) (poly(NIPAM)) derivative (1). We have determined critical aggregation concentration (CAC) and average diameter using fluorescence spectroscopy dynamic light scattering experiments, respectively. exploited NIPAM backbone polymer to thermally transform swollen hydrophilic poly(NIPAM) more globular hydrophobic state at lower solution temperature (LCST). Finally,...
Abstract A new class of polymeric thermometers with a memory function is reported that based on the supramolecular host–guest interactions poly( N ‐isopropylacrylamide) (PNIPAM) side‐chain naphthalene guest moieties and tetracationic macrocycle cyclobis(paraquat‐p‐phenylene) (CBPQT 4+ ) as host. This thermometer exhibits for thermal history solution, which arises from large hysteresis thermoresponsive LCST phase transition (LCST=lower critical solution temperature). formation metastable...
The effect of acceptor energy level on electron transfer rate in blends the polymer solar-cell material poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7) is studied using time-resolved fluorescence. Fast less than 2 ps observed for a driving force between 0.2 and 0.6 eV slower outside this range. This dependence described by Marcus theory with reorganization ≈0.4 eV. Organic semiconductors have...
We present solution-processed organic solar cells based on subphthalocyanine acceptors with strong light harvesting in the visible region and an efficiency up to 3.5%.
The structure adopted by biomaterials, such as proteins, at interfaces is a crucial parameter in range of important biological problems. It critical property defining the functionality cell/bacterial membranes and biofilms (i.e., antibiotic-resistant infections) exploitation immobilized enzymes biocatalysis. intrinsically small quantities materials precludes application conventional spectroscopic phenomena routinely used for (bio)structural analysis due to lack sensitivity. We show that...
The structural order of biopolymers, such as proteins, at interfaces defines the physical and chemical interactions biological systems with their surroundings is hence a critical parameter in range problems. Known spectroscopic methods for routine rapid monitoring biolayers are generally only applied to model single-component that possess spectral fingerprint which highly sensitive orientation. This behavior not generic property may require addition label. Importantly, techniques cannot...
The refractive index sensitivity of plasmonic fields has been exploited for over 20 years in analytical technologies. While this can be used to achieve attomole detection levels, they are essence binary measurements that sense the presence/absence a predetermined analyte. Using fields, not effective indices but provide more "granular" information about structural characteristics medium, provides rich output, which affords opportunities create new powerful and flexible sensing technologies...
We studied crystallinity and exciton harvesting in bulk heterojunctions of the semiconducting polymer PffBT4T-2OD electron acceptor PC71BM that are used to make highly efficient organic solar cells. Grazing incidence wide-angle X-ray scattering shows size crystalline domains increases ∼18 nm photovoltaic blends upon thermal annealing at 100 °C for 5 min. These larger than typical diffusion lengths conjugated polymers. Time-resolved fluorescence measurements show length from ∼14 ∼24...
Organic hole-transporting materials (HTM) have shown excellent ability in achieving high efficiency perovskite solar cells.
Flavins feature multiple attributes that explain their widespread occurrence in nature, including photostability, reversible electrochemistry, and especially the tunability of optical, electronic, redox properties by supramolecular interactions modification chemical structure. are important cofactors for enzymatic catalysis central to a wide variety processes, biosynthesis, electron transport, photosynthesis, DNA repair. The range processes catalyzed flavins makes them promising leads...
Abstract Optimal performance of nanophotonic devices, including sensors and solar cells, requires maximizing the interaction between light matter. This efficiency is optimized when active moieties are localized in areas where electromagnetic (EM) fields confined. Confinement matter these ‘hotspots’ has previously been accomplished through inefficient ‘top-down’ methods. Here we report a rapid ‘bottom-up’ approach to functionalize selective regions plasmonic nanostructures that uses...
Abstract Most polymeric thermoresponsive hydrogels contract upon heating beyond the lower critical solution temperature (LCST) of polymers used. Herein, we report a supramolecular hydrogel system that shows opposite dependence. When non‐thermosesponsive NaphtGel, containing dialkoxynaphthalene guest molecules, becomes complexed with tetra cationic macrocyclic host CBPQT 4+ , swelling occurred as result host–guest complex formation leading to charge repulsion between units, well an osmotic...
Singlet exciton diffusion was studied in the efficient organic photovoltaic electron donor material DTS(FBTTh2)2. Three complementary time-resolved fluorescence measurements were performed: quenching planar heterojunctions with an acceptor, exciton-exciton annihilation, and depolarization. The average diffusivity increases upon annealing from 1.6 × 10-3 to 3.6 cm2 s-1, resulting enhancement of mean two-dimensional length (LD = (4Dτ)1/2) 15 27 nm. About 30% excitons get trapped very quickly...
In this article, we report the facile synthesis of metal-free dyes 6 and 7, their solution-based optical redox properties use as sensitizers in dye-sensitized solar cells (DSSCs). Our studies indicate that addition second thiophene unit dye decreases oxidation reduction potential consequently band gap molecule compared to 6. Furthermore, increasing length conjugated spacer also affects on DSSCs, with 7 providing a higher power conversion efficiency (η = 4.49 versus 3.23%).
This paper reports the synthesis of a series new half-squaraine dyes (Hf-SQ) based around common chromophoric unit but with differently positioned linker groups.
Chiral biological and pharmaceutical molecules are analyzed with phenomena that monitor their very weak differential interaction circularly polarized light. This inherent weakness results in detection levels for chiral inferior, by at least six orders of magnitude, to the single molecule level achieved state-of-the-art chirally insensitive spectroscopic measurements. Here, we show a phenomenon based on quantum metamaterials (CQMs) overcomes these intrinsic limits. Specifically, emission from...
Strong dipoles in molecular HTMs can cause energetic disorder, leading to reduced mobility. This be counteracted by a preferential antiparallel dipole ordering brought about intermolecular hydrogen bond-assisted pairing.
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCPI: A Recipe for Improving Applicable Properties of Discotic Liquid CrystalsNeville Boden, Richard J. Bushby, Graeme Cooke, Owen R Lozman, and Zhibao LuView Author Information SOMS Centre, University Leeds Woodhouse Lane, West Yorkshire, LS2 9JT United Kingdom Cite this: Am. Chem. Soc. 2001, 123, 32, 7915–7916Publication Date (Web):July 19, 2001Publication History Received20 September 2000Revised4 June 2001Published online19 July inissue 1...