A5040859350- Analytical Chemistry and Sensors
- Spectroscopy and Quantum Chemical Studies
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Perovskite Materials and Applications
- Spectroscopy and Laser Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- TiO2 Photocatalysis and Solar Cells
- Advanced Chemical Physics Studies
- Electrochemical Analysis and Applications
- Porphyrin Metabolism and Disorders
- Catalysis and Oxidation Reactions
- Advanced Data Storage Technologies
- Metal Extraction and Bioleaching
- Porphyrin and Phthalocyanine Chemistry
- Minerals Flotation and Separation Techniques
- Remote Sensing and LiDAR Applications
- Industrial Vision Systems and Defect Detection
- Nonlinear Optical Materials Studies
- Spectroscopy and Chemometric Analyses
- Wood and Agarwood Research
- Heme Oxygenase-1 and Carbon Monoxide
- Catalytic Processes in Materials Science
- Scientific Computing and Data Management
University of Wisconsin–Madison
2014-2023
Understanding crystal growth and improving material quality is important for semiconductors electronic, optoelectronic, photovoltaic applications. Amidst the surging interest in solar cells based on hybrid organic-inorganic lead halide perovskites exciting progress device performance, improved understanding better control of these could further boost their optoelectronic performance. Here, we report new insights perovskite materials, especially crystalline nanostructures. Specifically,...
Iron pyrite (FeS2) is considered a promising earth-abundant semiconductor for solar energy conversion with the potential to achieve terawatt-scale deployment. However, despite extensive efforts and progress, efficiency of iron remains below 3%, primarily due low open circuit voltage (VOC). Here we report comprehensive investigation on {100}-faceted n-type single crystals understand its puzzling VOC. We utilized electrical transport, optical spectroscopy, surface photovoltage,...
Forests, estimated to contain two thirds of the world's biodiversity, face existential threats due illegal logging and land conversion. Efforts combat support sustainable value chains are hampered by a critical lack affordable scalable technologies for field-level inspection wood products. To meet this need we present XyloTron, complete, self-contained, multi-illumination, field-deployable, open-source platform field imaging identification forest products at macroscopic scale. The XyloTron...
We report the first coherent multidimensional spectroscopy study of a MoS2 film. A four-layer sample was synthesized on silica substrate by simplified sulfidation reaction and characterized absorption Raman spectroscopy, atomic force microscopy, transmission electron microscopy. State-selective (CMDS) as-prepared film resolved dynamics series diagonal cross-peak features involving spin-orbit split B excitonic states continuum states. The spectra are striped that similar to those observed in...
Ultrafast spectroscopy is often collected in the mixed frequency/time domain, where pulse durations are similar to system dephasing times. In these experiments, expectations derived from familiar driven and impulsive limits not valid. This work simulates mixed-domain four-wave mixing response of a model develop for this more complex field-matter interaction. We explore frequency delay axes. show that line shapes exquisitely sensitive excitation widths delays. Near overlap, pulses induce...
PEDOT:PSS, a transparent electrically conductive polymer, finds widespread use in electronic devices. While empirical efforts have increased conductivity, detailed understanding of the coupled and morphological landscapes PEDOT:PSS has lagged due to substantial structural heterogeneity on multiple length-scales. We an optical microresonator-based absorption spectrometer perform single-particle measurements, providing bottom-up examination structure morphology ranging from single polymers...
Adoption of commercial photoreactors as standards for photocatalysis research could be limited by high cost. We report the development Wisconsin Photoreactor Platform (WPP), an open-source photoreactor architecture potentially suitable general adoption. The WPP integrates inexpensive components and common high-intensity LEDs in a 3D-printed enclosure. Dimensions features reactors can readily varied configurations easily reproduced. performance is evaluated using literature transformations...
Triply resonant sum frequency (TRSF) spectroscopy is a fully coherent mixed vibrational–electronic spectroscopic technique that ideally suited for probing the couplings become important in driving reactions. We have used cyanocobalamin (CNCbl) and deuterated aquacobalamin (D2OCbl+) as model systems demonstrating feasibility of using selectivity multidimensional to resolve electronic states within broad absorption spectra transition metal complexes identify nature vibrational state couplings....
We present a methodology for obtaining quantitative ultrafast multiresonant coherent multidimensional spectra. Using the solvent and cuvette as an internal standard, we extract third-order susceptibility of PbSe quantum dots through method standard dilution. The resonant is extracted using few parameter fit. After accounting differences in pulse width experimental geometry, find agreement between our measured prior measurements. demonstrate how can be directly compared with theoretical...
In this work, we present the Wisconsin Oscillator, a small, inexpensive, low-power circuit for powering ion-guiding devices such as multipole ion guides, funnels, active ion-mobility devices, and non-mass-selective traps. The can be constructed under $30 produces two antiphase RF waveforms of up to 250 Vp-p in high kilohertz low megahertz range while drawing less than 1 W power. output amplitude is determined by 0-6.5 VDC drive voltage, voltage amplification achieved using resonant LC...
Modern instrumentation development often involves the incorporation of many dissimilar hardware peripherals into a single unified instrument. The increasing availability modular has brought greater instrument complexity to small research groups. This stretches capability traditional, monolithic orchestration software. In cases, lack software flexibility leads creative researchers feel frustrated, unable perform experiments they envision. Herein, we describe Yet Another acQuisition (yaq),...
The design of a headspace pressure-monitoring reactor for measuring the uptake/evolution gas in gas–liquid chemical transformations is described. features parallel setup with ten-reactor cells, each featuring low working volume 0.2–2 ml, pressure capacity from 0 to 150 PSIa, and high sensitivity transducer. cells are composed commercially available disposable thick-walled glassware compact monolithic weld assemblies. software interface controls temperature while monitoring cells. Reactions...
Nonlinear multidimensional spectroscopy (MDS) is a powerful experimental technique used to interrogate complex chemical systems. MDS promises reveal energetics, dynamics, and coupling features of between the many quantum-mechanical states that these systems contain. In practice, simulation typically required connect measured spectra with microscopic physical phenomena. We present an open-source Python package, WrightSim, designed simulate MDS. Numerical integration evolve system as it...