A5072141798- Organic Electronics and Photovoltaics
- Metal-Organic Frameworks: Synthesis and Applications
- Conducting polymers and applications
- Machine Learning in Materials Science
- Advanced Memory and Neural Computing
- Thin-Film Transistor Technologies
- Perovskite Materials and Applications
- Covalent Organic Framework Applications
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Organic Light-Emitting Diodes Research
- Crystallization and Solubility Studies
- Refrigeration and Air Conditioning Technologies
- Crystallography and molecular interactions
- Luminescence and Fluorescent Materials
- Innovative Microfluidic and Catalytic Techniques Innovation
- Energetic Materials and Combustion
- Supramolecular Self-Assembly in Materials
- Advanced Thermodynamic Systems and Engines
- Phase Equilibria and Thermodynamics
- Force Microscopy Techniques and Applications
- Semiconductor materials and devices
- Nanoplatforms for cancer theranostics
- Nanowire Synthesis and Applications
- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
University of Virginia
2017-2025
Charlottesville Medical Research
2017-2020
Massachusetts Institute of Technology
2018
IIT@MIT
2016
Stanford University
2011-2015
Zero to Three
2013
Patterns composed of solvent wetting and dewetting regions promote lateral confinement solution-sheared lattice-strained TIPS-pentacene crystals. This causes aligned crystal growth, the smallest patterns 0.5 μm wide promotes formation highly strained, aligned, single-crystalline with mobility as high 2.7 cm2 V−1 s−1.
Well-aligned C60 and TIPS-pentacene single-crystals grow on a common substrate by droplet-pinned crystallization method. Complementary inverters based the two aligned crystals show gain values as high 155. This work demonstrates simple solution-processing approach to investigate high-performance complementary circuits organic single-crystals. Detailed facts of importance specialist readers are published ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset....
Dense alignment of single-walled carbon nanotubes over a large area is demonstrated using novel solution-shearing technique. A density 150-200 per micro-meter achieved with current 10.08 μA μm(-1) at VDS = -1 V. The on-current improved by factor 45 that random-network nanotubes.
The synthesis and characterization of a fused thiophene-diketopyrrolopyrrole based semiconducting polymer PTDPPTFT4 is presented. A number synthetic challenges have been overcome in the development practical scalable synthesis. Characterization by Gel Permeation Chromatography (GPC) over range temperatures has revealed tendency this to aggregate even at elevated confirmed that molecular weight values obtained are for nonaggregated material. This meets important requirements potential...
Metal halide perovskites have demonstrated strong potential for optoelectronic applications. Particularly, two-dimensional (2D) emerged to be promising materials due their tunable properties and superior stability compared three-dimensional counterparts. For high device performance, 2D need a vertical crystallographic orientation with respect the electrodes achieve efficient charge transport. However, is difficult various compositions lack of understanding thin film nucleation growth...
The solution shearing method has previously been used to tune the molecular packing and crystal thin film morphology of small organic semiconductors (OSCs). Here, we study how impacts causes structural rearrangements two polymeric OSCs with interdigitated side chain packing, namely P2TDC17FT4 PBTTT-C16. conjugated backbone tilt angle polymer were changed by conditions, an accompanying change in charge carrier mobility was observed. For PBTTT-C16, out-of-plane lamellar spacing increased...
Using non‐chlorinated solvents for polymer device fabrication is highly desirable to avoid the negative environmental and health effects of chlorinated solvents. Here, a mixed solvent system, composed by mixture tetrahydronaphthalene p ‐xylene, described processing high mobility donor‐acceptor fused thiophene‐diketopyrrolopyrrole copolymer (PTDPPTFT4) in thin film transistors. The use system on performance, e.g., charge transport, morphology, molecular packing, are investigated. ‐Xylene...
Abstract High‐speed solution shearing, in which a drop of dissolved material is spread by coating knife onto the substrate, has emerged as versatile, yet simple technique to prepare high‐mobility organic thin film transistors. Solution shearing and subsequent drying crystallization conjugated molecules probed situ using microbeam grazing incidence wide‐angle X‐ray scattering (μGIWAXS). We demonstrate advantages this approach study based crystal nucleation growth, identify casting parameter...
Organic bulk heterojunction (BHJ) solar cells are a promising alternative for future clean-energy applications. However, to become attractive consumer applications, such as wearable, flexible, or semitransparent power-generating electronics, they need be manufactured by high-throughput, low-cost, large-area-capable printing techniques. most research reported on BHJ is conducted using spin coating, single batch fabrication method, thus limiting the results lab. In this work, we investigate...
We experimentally and theoretically investigate the thermal conductivity mechanical properties of polycrystalline HKUST-1 metal-organic frameworks (MOFs) infiltrated with three guest molecules: tetracyanoquinodimethane (TCNQ), 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ), (cyclohexane-1,4-diylidene)dimalononitrile (H4-TCNQ). This allows for modification interaction strength between host, presenting an opportunity to study fundamental atomic scale mechanisms how molecules...
Flower-like polyacrylonitrile (PAN) particles have shown promising performance for numerous applications, including sensors, catalysis, and energy storage. However, the detailed formation process of these unique structures during polymerization has not been investigated. Here, we elucidate flower-like PAN through a series in situ ex experiments. We following key findings. First, lamellar petals within were predominantly orthorhombic crystals. Second, branching lamellae particle arose from...
The fabrication of polymer-MOF composite gels holds great potential to provide emergent properties for drug delivery, environmental remediation, and catalysis. To leverage the full these composites, we investigated how presence chemistry polymers impact MOF formation within composites and, in turn, MOFs polymer gelation. We show that with a high density strongly metal-binding carboxylic acids inhibit formation; however, reducing or substituting them weaker hydroxyl groups permits both...
Significance Solution-processed organic electronics are expected to pave the way for low-cost large-area with new and exciting applications. However, realizing solution-processed requires densely packed transistors patterned precisely registered semiconductors (OSCs) within transistor channel uniform electrical properties over a large area, task that remains significant challenge. To address such challenge, we have developed an innovative technique generates self-patterned self-registered...
We demonstrate high-performance sequentially solution-processed organic photovoltaics (OPVs) with a power conversion efficiency (PCE) of 5% for blend films using donor polymer based on the isoindigo-bithiophene repeat unit (PII2T-C10C8) and fullerene derivative [6,6]-phenyl-C[71]-butyric acid methyl ester (PC71BM). This has been accomplished by systematically controlling swelling intermixing processes layer various processing solvents during deposition fullerene. find that among used...
Metal–organic frameworks (MOFs) are a promising class of functional materials with applications in catalysis, separations, electronics, and drug delivery, among others. Despite range techniques utilized for MOF synthesis, generalizable scalable approach has yet to be developed producing MOFs without using environmentally damaging organic solvents. Here, we look at synthesis as reaction an aqueous medium propose new methods measuring conversion selectivity. We show that controlling reactant...
Synthesis of porous, covalent crystals such as zeolites and metal-organic frameworks (MOFs) cannot be described adequately using existing crystallization theories. Even with the development state-of-the-art experimental computational tools, identification primary mechanisms nucleation growth MOFs remains elusive. Here, time-resolved in-situ X-ray scattering coupled a six-parameter microkinetic model consisting ∼1 billion reactions up to ∼100 000 metal nodes, we identify autocatalysis...
High-entropy metal-organic frameworks (HE-MOFs) offer a promising approach for advanced applications like energy storage, catalysis, and sensing, thanks to their high configurational entropy synergistic effects from multiple elements. Despite the progress in synthesizing HE-MOFs, primarily through solvothermal methods, little is known about reticular chemistry governing morphological variations. This work presents new class of porphyrinic offering insights into lattice transformations by...
In this work, two model pharmaceutical compounds, glycine and acetaminophen, were crystallized using a flow coating technique termed solution shearing to create thin films with controllable polymorphism. Controlling polymorphism in compounds can provide optimized solubility bioavailability. Thin of acetaminophen obtained simple method, these characterized cross polarized optical microscopy grazing incidence X-ray diffraction. Films as different polymorphs (α β for form I II acetaminophen) by...
NU-1000, a zirconium (Zr)-based metal–organic framework (MOF), is promising candidate for heterogeneous catalysis, gas storage, electrocatalysis, and drug-delivery applications due to its large pore size mesoporous structure. However, the synthesis of NU-1000 may produce another polymorph NU-901, which has smaller average volume than NU-1000. Similarly, presence as phase impurity in NU-901 crystallites undesired. Although phase-pure have been successfully synthesized bulk, multiple such...