A5062568510- Photoreceptor and optogenetics research
- Photosynthetic Processes and Mechanisms
- Spectroscopy and Quantum Chemical Studies
- Porphyrin and Phthalocyanine Chemistry
- Perovskite Materials and Applications
- Light effects on plants
- Quantum Dots Synthesis And Properties
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Supramolecular Chemistry and Complexes
- Spectroscopy and Laser Applications
- Semiconductor Quantum Structures and Devices
- Electrochemical Analysis and Applications
- Conducting polymers and applications
- ZnO doping and properties
- Molecular Junctions and Nanostructures
- Electronic and Structural Properties of Oxides
- Organic Light-Emitting Diodes Research
- Drilling and Well Engineering
- Solid-state spectroscopy and crystallography
- Photochemistry and Electron Transfer Studies
- bioluminescence and chemiluminescence research
- Gold and Silver Nanoparticles Synthesis and Applications
- Luminescence and Fluorescent Materials
- Advanced Chemical Physics Studies
University of East Anglia
2016-2025
The University of Melbourne
2018-2025
Research Complex at Harwell
2024
Rutherford Appleton Laboratory
2024
ARC Centre of Excellence in Advanced Molecular Imaging
2024
Australian Research Council
2013-2023
Georgia Institute of Technology
2022
Louisiana State University
2022
Norwich Research Park
2016-2021
Swinburne University of Technology
2009-2016
Mixed organolead halide perovskites (MOHPs), CH3 NH3 Pb(Brx I1-x )3 , have been shown to undergo phase segregation into iodide-rich domains under illumination, which presents a major challenge their development for photovoltaic and light-emitting devices. Recent work suggested that phase-segregated are localized at crystal boundaries, driving investigations the role of edge structure growth larger crystals with reduced surface area. Herein, method growing large (30×30×1 μm3 ) monocrystalline...
Photochemical isomerization in sterically crowded chiral alkenes is the driving force for molecular rotary motors nanoscale machines. Here excited-state dynamics and structural evolution of prototypical light-driven motor are followed on ultrafast time scale by femtosecond stimulated Raman spectroscopy (FSRS) transient absorption (TA). TA reveals a sub-100-fs blue shift decay Franck-Condon bright state arising from relaxation along reactive potential energy surface. The accompanied...
Abstract Nanolasers hold promise for applications including integrated photonics, on-chip optical interconnects and sensing. Key to the realization of current cavity designs is use nanomaterials combining high gain with radiative efficiency. Until now, efforts enhance performance semiconductor have focused on reducing rate non-radiative recombination through improvements material quality complex passivation schemes. Here we employ controlled impurity doping increase recombination. This...
Layered perovskite films, composed of two-dimensional (2D) Ruddlesden–Popper perovskites (RPPs), show improved stability compared to their conventional three-dimensional (3D) counterparts in solar cells (PSCs). However, 2D PSCs exhibit a lower power conversion efficiency (PCE), which has been attributed compositional inhomogeneity and nonuniform alignment the phases. Methylammonium chloride (MACl) adopted as an additive improve PCE operational PSCs, although role MACl performance enhancement...
Significance Multiheme cytochromes have been identified as essential proteins for electron exchange between bacterial enzymes and redox substrates outside of the cell. In microbiology, these contribute to efficient energy storage conversion. For biotechnology, multiheme production green fuels electricity. Furthermore, inspire design molecular-scale electronic devices. Here, we report exceptionally high rates heme-to-heme transfer in a cytochrome. We expect similarly rates, among highest...
Thermally activated delayed fluorescence has enormous potential for the development of efficient light emitting diodes. A recently discovered class molecules (the carbene–metal–amides, CMAs) are exceptionally promising as they combine small singlet–triplet energy gap required thermal activation with a large transition moment emission. Calculations suggest excited state structural dynamics modulate critical coupling between singlet and triplet, but disagree on nature those dynamics. Here we...
Light-activated protein domains provide a convenient, modular, and genetically encodable sensor for optogenetics optobiology. Although these have now been deployed in numerous systems, the precise mechanism of photoactivation accompanying structural dynamics that modulate output domain activity remain to be fully elucidated. In C-terminal light–oxygen–voltage (LOV) plant phototropins (LOV2), blue light activation leads formation an adduct between conserved Cys residue embedded FMN...
The development of efficient drug formulations for Parkinson's disease (PD) treatment is challenged by achieving pharmacokinetic profiles, reduced side effects, and better permeability through the blood–brain barrier (BBB). As nanoparticles may facilitate delivery drugs in brain due to their high-loading capacity ability cross biological barriers, we designed two different types selenium (SeNPs) that increase transport across BBB act as antioxidants at site action. SeNPs were functionalized...
OaPAC, the photoactivated adenylyl cyclase from Oscillatoria acuminata, is composed of a blue light using FAD (BLUF) domain fused to an adenylate (AC) domain. Since both BLUF and AC domains are part same protein, OaPAC model for understanding how ultrafast modulation chromophore binding pocket caused by photoexcitation results in activation output on μs-s time scale. In present work, we use unnatural amino acid mutagenesis identify specific sites protein that involved transducing signal site...
The molecular symmetry in rare earth (RE) coordination chemistry is critically important for controlling the electronic structure of RE ion and resulting magnetic photophysical properties. Here, we report a family complexes with unusual C3-point symmetry: [REIII(Br4catH)3(tpa)] (Br4catH- = tetrabromocatecholate, tpa tris(2-pyridylmethyl)amine). synthesis solid-state characterisation eleven analogues (RE Y, Sm to Lu) were performed, enabling systematic investigation effect on various physical...
One of the key challenges in developing efficient organic light-emitting diodes (OLEDs) is overcoming loss channel triplet excitons. A common approach to mitigate these losses enhance external quantum efficiency OLEDs employing emitter molecules optimized for thermally activated delayed fluorescence (TADF) or triplet-triplet annihilation (TTA). However, achieving both solid state from same chromophore poses a formidable challenge due energetic and structural requirements needing be met...
The development of new and improved photoswitches for photonic materials photo-pharmaceutics is an important research objective. Recently a family based on the rhodanine motif was described. In this work photophysics representative example that are investigated. photoswitch’s shown to be remarkably different to, more complex than, those observed closely related photoactive monomethines dyes, which typically relax in picoseconds by internal conversion. photoswitch allowed Franck-Condon...
Abstract 2D Ruddlesden‐Popper phase perovskites (RPPs) offer significant potential for next‐generation photovoltaics owing to their excellent intrinsic stability. Fully understanding the crystalline configuration of perovskite films is essential further enhancing power‐conversion‐efficiency (PCE) solar cells (2D‐PSCs). Herein, structural heterogeneities, including profiles crystal orientation and defect distribution, at both microscopic mesoscopic scales are investigated. Empty voids...
We demonstrate three-dimensional (3D) electronic spectroscopy of excitons in a double quantum well system using phase retrieval algorithm to obtain the information that is lost measurement intensities. By extending analysis two-dimensional three dimensions, contributions from different mechanical pathways can be further separated allowing greater insight into mechanisms responsible for observed peaks. examining slices complete spectrum, not only relative amplitudes determined, but peak...
The flavin chromophore in blue-light-using FAD (BLUF) photoreceptors is surrounded by a hydrogen bond network that senses and responds to changes the electronic structure of on ultrafast time scale. includes strictly conserved Tyr residue, previously we explored role this Y21, photoactivation mechanism BLUF protein AppABLUF introduction fluorotyrosine (F-Tyr) analogues modulated pKa reduction potential Y21 3.5 pH units 200 mV, respectively. Although little impact forward (dark- light-adapted...
The rational engineering of photosensor proteins underpins the field optogenetics, in which light is used for spatiotemporal control cell signaling. Optogenetic elements function by converting electronic excitation an embedded chromophore into structural changes on microseconds to seconds time scale, then modulate activity output domains responsible biological Using time-resolved vibrational spectroscopy coupled with isotope labeling, we have mapped evolution LOV2 domain flavin binding...
Multiheme cytochromes attract much attention for their electron transport properties. These proteins conduct electrons across bacterial cell walls and along extracellular filaments when purified can serve as bionanoelectronic junctions. Thus, it is important necessary to identify understand the factors governing transfer in this family of proteins. To end we have used ultrafast transient absorbance spectroscopy, define heme–heme dynamics representative multiheme cytochrome STC from...
In order to analyze the potential fuel burn benefit from electrification of aircraft powertrains, it is important quantify amount weight that will be added for each additional component electric powertrain. This paper provides a projection specific power and efficiency converters, (AC-DC, DC-AC, or DC-DC), through year 2050. Data was first collected on state art converters in multiple application areas, creating converter database. Relevant powers were set historical data 1976-2020, then...
We utilize a three-dimensional (3D) visible spectroscopy to reveal and explore coherent coupling between excitons localized GaAs quantum wells separated by barriers 4 6 nm wide. The coupled were energetically 43 meV, close the longitudinal optical phonon energy, due different widths of which they localized. ability isolate coherence pathways in 3D has made it possible not only identify weak coupling, but also nature through analysis peak shapes. This shape showed inhomogeneous broadening be...
A detailed understanding of the operation and efficiency unidirectional photomolecular rotary motors is essential for their effective exploitation in molecular nanomachines. Unidirectional motion relies on light-driven conversion from a stable (1 a) to metastable b) conformation, which then relaxes through thermally driven helix inversion ground state. The excited-state surface has thus far only been experimentally characterised 1 a. Here we probe metastable, b, excited state, utilising...
The purpose of this paper is to generate specific power and efficiency projections through the year 2050 for electric machines aircraft applications. A general literature review was performed identify types that are commonly used which have biggest potential future applications due their high efficiency. database with historical data built include parameters such as weight [kg], rated [kW], [kW/kg], RPM, efficiency, year, motor cooling type, application type allow trend identification...