A5033132180- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Copper-based nanomaterials and applications
- ZnO doping and properties
- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- Crystallography and molecular interactions
- Electronic and Structural Properties of Oxides
- Crystal Structures and Properties
- Luminescence and Fluorescent Materials
- Luminescence Properties of Advanced Materials
- Quantum Dots Synthesis And Properties
- Electrochemical Analysis and Applications
- Chalcogenide Semiconductor Thin Films
- Strong Light-Matter Interactions
- Advanced Chemical Physics Studies
- Acoustic Wave Resonator Technologies
- Semiconductor Quantum Structures and Devices
- Organic Light-Emitting Diodes Research
- Quantum Information and Cryptography
- Geochemistry and Elemental Analysis
- Photochemistry and Electron Transfer Studies
- Graphene research and applications
- Cold Atom Physics and Bose-Einstein Condensates
- Nonlinear Optical Materials Studies
Monash University
2018-2023
UNSW Sydney
2016-2021
Clayton Foundation
2020
Australian Regenerative Medicine Institute
2018-2020
Temple University
2015-2018
Temple College
2015-2017
Northwestern University
2012-2017
Northwest University
2015-2016
Philadelphia University
2016
University of Chicago
2010
The synthesis and properties of the hybrid organic/inorganic germanium perovskite compounds, AGeI3, are reported (A = Cs, organic cation). systematic study this reaction system led to isolation 6 new semiconductors. Using CsGeI3 (1) as prototype compound, we have prepared methylammonium, CH3NH3GeI3 (2), formamidinium, HC(NH2)2GeI3 (3), acetamidinium, CH3C(NH2)2GeI3 (4), guanidinium, C(NH2)3GeI3 (5), trimethylammonium, (CH3)3NHGeI3 (6), isopropylammonium, (CH3)2C(H)NH3GeI3 (7) analogues....
Thin-film membranes consisting of nanoparticles are interest in applications ranging from nanosieves to electric, magnetic, or photonic devices and sensors. However, the fabrication large-scale a simple but controlled way has remained challenge, due limited understanding their mechanical properties. Systematic experiments on ultrathin, freestanding nanoparticle different core materials, sizes, capping ligands reported. The results demonstrate that drying-mediated self-assembly process can be...
Abstract We report a synthetic method to enhance the electrocatalytic activity of birnessite for oxygen evolution reaction (OER) by intercalating Ni 2+ ions into interlayer region. Electrocatalytic studies showed that nickel (7.7 atomic %)‐intercalated exhibits an overpotential ( η ) 400 mV OER at anodic current 10 mA cm −2 . This is significantly lower than values ≈700 mV) and active catalyst β‐Ni(OH) 2 ≈550 mV). Molecular dynamics simulations suggest competition among interactions between...
Low-energy photons, which are not used by a solar cell, can be converted to higher-energy photons photon upconversion. The figure-of-merit of upconvertors, JUC, is given in mA cm–2 under 1 sun excitation conditions. A device-relevant JUC should less than 0.1 cm–2. However, date, the highest reported 10–2 range. In this Perspective, we analyze shortcomings previously devices and unfold roadmap toward device-relevant, high-efficiency upconvertors.
Carbonization of nature-inspired polydopamine can yield thin films with high electrical conductivity. Understanding the structure carbonized PDA (cPDA) is therefore highly desired. In this study, neutron diffraction, Raman spectroscopy, and other techniques indicate that cPDA samples are mainly amorphous some short-range ordering graphite-like emerges increasing heat treatment temperature. The conductivity Seebeck coefficient show different trends temperature, while thermal remains...
Ferroelectricity in organic materials remains a subject of great interest, given its potential impact as lightweight information storage media. Here we report supramolecular charge-transfer cocrystals formed by electron acceptor and donor molecules that exhibit ferroelectric behavior along two distinct crystallographic axes. The solid-state superstructure the reveals 2:1 ratio to assemble into nearly orthogonal mixed stacks which are positioned for face-to-face edge-to-face orientations,...
We report a synthetic method to increase the catalytic activity of birnessite toward water oxidation by intercalating copper in interlayer region layered manganese oxide. Intercalation copper, verified XRD, XPS, ICP, and Raman spectroscopy, was accomplished exposing suspension Cu+-bearing precursor molecule that underwent disproportionation solution yield Cu0 Cu2+. Electrocatalytic studies showed Cu-modified exhibited an overpotential for ∼490 mV (at 10 mA/cm2) Tafel slope 126 mV/decade...
To quantify the diffusion constant of small molecules in plant cell wall, fluorescence from carboxyfluorescein (CF) intact roots Arabidopsis thaliana was recorded. Roots were immersed a solution fluorescent dye and viewed through confocal microscope. These are sufficiently transparent that much apoplast can be imaged. The coefficient, D(cw), CF wall probed using two protocols: recovery after photobleaching loss following perfusion with dye-free solution. Diffusion coefficients obtained...
A new series of metal chalcogenides with the formula Ba6Ag2.67+4δSn4.33−δS16–xSex (x = 0 for 1, x 6.47 2, and 16 3) were synthesized. Compounds 1–3 are isotypic a three-dimensional structure crystallize in noncentrosymmetric space group I4̅3d. The framework 1 is constructed by alternative corner-sharing AgS4 SnS4 tetrahedra Ba2+ cations distributed within channels. Ag+ atoms disordered two neighboring silver sites trapped various coordination environments. Selected area electron diffraction...
Abstract Copper redox mediators have enabled open‐circuit voltages ( V OC ) of over 1.0 in dye‐sensitized solar cells (DSCs) and helped to establish DSCs as the most promising cell technology low‐light conditions. The addition additives such 4‐ tert ‐butylpyridine (tBP) these electrolytes has achieving high performances. However, emerging evidence suggests that tBP coordinates Cu(II) species limits performance electrolytes. To date, implications this coordination are poorly understood. Here,...
While ions are known to perturb hydrogen bonding networks in bulk water, our understanding of such effects is less developed for interfaces. Alumina/water interfaces highly ordered due strong interactions between interfacial water molecules and adjacent aluminol groups. However, how alter this interaction not yet known. Herein, address the effect sodium halide salts on environment we investigated charged alumina (0001) surfaces using steady-state time-resolved vibrational sum frequency...
Cuprous oxide (Cu2O) is a promising catalyst for several important reactions. However, the atomic structures of defective Cu2O surfaces, which critically affect catalytic properties both thermodynamically and kinetically, are not unambiguously characterized. High-resolution scanning tunneling microscopy (STM), combined with density functional theory (DFT) calculations STM simulations, has been used to determine structure (111) surface bulk crystal. The single crystal surface, processed by...
Abstract We report a synthetic method to enhance the electrocatalytic activity of birnessite for oxygen evolution reaction (OER) by intercalating Ni 2+ ions into interlayer region. Electrocatalytic studies showed that nickel (7.7 atomic %)‐intercalated exhibits an overpotential ( η ) 400 mV OER at anodic current 10 mA cm −2 . This is significantly lower than values ≈700 mV) and active catalyst β‐Ni(OH) 2 ≈550 mV). Molecular dynamics simulations suggest competition among interactions between...
High concentrations of molecular sensitizer shorten emitter triplet lifetimes and lead to lower upconversion efficiency.
Single crystals of cuprous oxide (Cu2O) with minimal defects were grown using the optical floating zone technique. Copper vacancies removed through promotion CuO precipitation within bulk Cu2O crystal following reaction CuCuCu2O + VCuCu2O OOCu2O → CuCuCuO OOCuO. This was promoted use high purity samples and by growing under an oxidizing atmosphere. Although increase in oxygen concentration atmosphere will initially to copper ratio, excess final is ultimately decreased formation as cools....
Triisopropylsilylethynyl-substituted acenes (TIPS-acenes) have received prominent attention in the field of singlet fission, pentacene derivative being an exothermic fission material, and tetracene a prototypical endothermic material. Little has been given to TIPS-anthracene, which is expected exhibit triplet–triplet annihilation, despite literature reports contrary. We show that there some evidence for TIPS-anthracene solutions, it does annihilation. apply anti-Stokes action spectroscopy...
Photochemical upconversion is performed using champion sensitizers and annihilators to achieve high efficiencies under one sun.
CsPbI3 perovskite nanocrystals are a promising optoelectronic material when stabilized in their cubic phase. While ongoing efforts have addressed this structural challenge through variety of meta-stabilization approaches, the postsynthesis purification these nanocrystal dispersions has remained challenge. In article, we undertake detailed investigation into chemical, optical, and changes that arise during nanocrystals. It is found degradation can only be avoided judicious control additives...