A5062300037- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Advanced Sensor and Energy Harvesting Materials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organic and Molecular Conductors Research
- Analytical Chemistry and Sensors
- Electrochemical sensors and biosensors
- Advanced Materials and Mechanics
- Fuel Cells and Related Materials
- Fullerene Chemistry and Applications
- Membrane Separation Technologies
- Molecular Junctions and Nanostructures
- Polymer Surface Interaction Studies
- Perovskite Materials and Applications
- Advanced battery technologies research
- Catalytic C–H Functionalization Methods
- Surfactants and Colloidal Systems
- Sulfur-Based Synthesis Techniques
- 3D Printing in Biomedical Research
- Membrane-based Ion Separation Techniques
- Electrospun Nanofibers in Biomedical Applications
- Radical Photochemical Reactions
University of Colorado Boulder
2023-2025
University of Southern Mississippi
2018-2025
Energy Institute
2025
University of Colorado System
2025
Hattiesburg Clinic
2018
University of Nevada, Reno
2015
Wageningen University & Research
2010
This article presents a study of layer-by-layer (LbL) formation poly-electrolyte multilayers (PEMs). Upon increasing ionic strength LbL growth patterns vary from linear for the lowest salt concentrations ([NaCl] = 0, 0.001, and 0.01 M) to exponential (for [NaCl] 0.5 1 M). The slope at strengths increases with [NaCl]. During process M NaCl we observe cross over which is orders magnitude larger than those observed low concentrations. We provide comprehensive interpretation these behaviors, are...
Hydrogels, known for their mechanical and chemical similarity to biological tissues, are widely used in biotechnologies, whereas semiconductors provide advanced electronic optoelectronic functionalities such as signal amplification, sensing, photomodulation. Combining semiconducting properties with hydrogel designs can enhance biointeractive functions intimacy at biointerfaces, but this is challenging owing the low hydrophilicity of polymer semiconductors. We developed a solvent...
Conjugated polymer (CP) films with nanometer-scale thickness exhibit unique properties distinct from their bulk counterparts, which is an important consideration for end application as thin film devices. In the realm of organic electronic devices, enabling high electrical conductance CPs often necessitates doping. However, impact doping on intrinsic mechanical properties, such elastic modulus, in ultrathin at device-relevant thicknesses not well understood and has been directly measured....
Organic electrochemical transistors (OECTs) represent a promising platform for biosensing applications in aqueous environments, including the sensitive detection of neurotransmitter molecules, such as serotonin (SE). Conventional methods SE detection, HPLC and ELISA, are time-consuming expensive. Electrochemical sensors, while cost-effective, often struggle with real-time selectivity issues due to interference from similar biomolecules, dopamine (DA), ascorbic acid (AA), uric (UA). These...
Because of their low operation voltage, high transconductance, and good aqueous compatibility, organic electrochemical transistors (OECTs) have been widely applied in the sensing small redox-active molecules such as dopamine. However, selective detection dopamine (DA) can be challenging since its mechanism relies on gate voltage offset caused by redox chemistry at electrode. To introduce selectivity toward detection, a polypyrrole film was electrochemically deposited Pt electrode with...
The influence of gate voltage in the off state (Vg,off) on stability transfer curve an organic electrochemical transistor (OECT) based interdigitated electrodes (IDEs) is studied this work. When a high Vg,off such as +0.5 V used, larger amount Na+ ion injection promoted compared to lower Vg,off, and noticeable decay drain current observed characteristics OECTs upon consecutive measurements. After crosslinking PEDOT:PSS, can be significantly reduced, indicating improved crosslinked OECTs....
The modern picture of negative charge carriers on conjugated polymers invokes the formation a singly occupied (spin-up/spin-down) level within polymer gap and corresponding unoccupied above conduction band edge. energy splitting between these sublevels is related to on-site Coulomb interactions electrons, commonly termed Hubbard U. However, spectral evidence for both experimental access U value still missing. Here, we provide by n-doping P(NDI2OD-T2) with [RhCp*Cp]2, [N-DMBI]2, cesium....
We copolymerize a norbornene monomer bearing pendant naphthalene diimide with cinnamate moiety to synthesize crosslinkable electron-transporting polymer and study its use in solution-processed n–i–p perovskite solar cells. The crosslinked material exhibits over 90% transparency the visible region higher thermal stability (>300 °C) lower surface energy than corresponding homopolymer of functionalized norbornene. Coating an ITO photo-crosslinked copolymer yields slightly work function...
The chemical doping reaction of P3HT with F4-TCNQ was studied by optical absorption spectroscopy, atomic force microscopy, and Kelvin probe microscopy. We demonstrate that aggregation preferentially occurs before the actual charge transfer step takes place, emphasizing impact morphology on conjugated polymers at molecular level.
We demonstrate the preparation of uniformly distributed poly(3-hexylthiophene) (P3HT) nanowire (NW) networks on a variety substrates. studied changes in optical, electronic, and morphological properties upon sequential doping by 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) UV–vis spectroscopy, atomic force microscopy (AFM), Kelvin probe (KPFM), electrical conductivity measurements. At moderate dopant concentration 250 μg/mL, P3HT NW retain their features with clear evolution...
2,2’-Bis(4-dimethylaminophenyl)- and 2,2'-dicyclohexyl-1,1',3,3'-tetramethyl-2,2',3,3'-tetrahydro-2,2'-bibenzo[ d ]imidazole ((N-DMBI) 2 (Cyc-DMBI) ) are quite strong reductants with effective potentials of ca. −2 V vs ferrocenium/ferrocene, yet relatively stable to air due the coupling redox bond-breaking processes. Here, we examine their use in accomplishing electron transfer-induced bond-cleavage reactions, specifically dehalogenations. The dimers reduce halides that have reduction less...
Abstract Determining the electronic levels associated with polarons, fundamental charge carriers in organic semiconductors, is key to understanding transport properties of these materials. Recent findings challenge traditional view by highlighting importance intra‐molecular Coulomb interactions polarons. Experimental evidence was previously presented for a revised model negative polaron case polymer semiconductor poly(NDI2OD‐T 2 ); there, addition an excess electron seen lead emergence...