A5055082358- Carbon Nanotubes in Composites
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Advanced Sensor and Energy Harvesting Materials
- Dendrimers and Hyperbranched Polymers
- Graphene research and applications
- Nanomaterials and Printing Technologies
- Advancements in Battery Materials
- Supercapacitor Materials and Fabrication
- Seismic Performance and Analysis
- Structural Behavior of Reinforced Concrete
- Nanopore and Nanochannel Transport Studies
- Luminescence and Fluorescent Materials
- Additive Manufacturing and 3D Printing Technologies
- Quantum Dots Synthesis And Properties
- Block Copolymer Self-Assembly
- Thin-Film Transistor Technologies
- Synthesis and properties of polymers
- Advanced Polymer Synthesis and Characterization
- Structural Load-Bearing Analysis
- Mesoporous Materials and Catalysis
- Lignin and Wood Chemistry
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organic Light-Emitting Diodes Research
National Research Council Canada
2015-2024
National Academies of Sciences, Engineering, and Medicine
2014-2015
General Electric (United States)
2001-2007
GE Global Research (United States)
2005-2007
General Electric (Israel)
2006
Université Laval
2001-2002
IBM (United States)
2002
University of California, Berkeley
1998-2001
Eindhoven University of Technology
2000-2001
University of Southern California
2000
Organic thin-film transistors (OTFTs) have lived to see great improvements in recent years. This review presents new insight into conduction mechanisms and performance characteristics, as well opportunities for modeling properties of OTFTs. The shifted focus research from novel chemical structures fabrication technologies that optimize morphology structural order is underscored by chapters on vacuum-deposited solution-processed organic semiconducting films. Finally, progress the growing...
N , ′ -dioctyl-3,4,9,10-perylene tetracarboxylic diimide (PTCDI-C8H) thin films have been implemented into organic thin-film field-effect transistors. Mobilities up to 0.6 cm2 V−1 s−1 and current on/off ratios >105 were obtained. Linear regime mobilities typically half of those measured in the saturation regime. X-ray studies reflection mode suggest a spacing ∼20 Å for evaporated PTCDI-C8H, which is consistent with value ∼21±2 obtained from our simulations when an interdigitated...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDendrimer-Containing Light-Emitting Diodes: Toward Site-Isolation of ChromophoresAdam W. Freeman, Shannon C. Koene, Patrick R. L. Malenfant, Mark E. Thompson, and Jean M. J. FréchetView Author Information Department Chemistry University California Berkeley 94720-1460 Southern Los Angeles 90089-0744 Cite this: Am. Chem. Soc. 2000, 122, 49, 12385–12386Publication Date (Web):November 22, 2000Publication History Received19 April 2000Revised16...
A systematic study on the use of 9,9-dialkylfluorene homopolymers (PFs) for large-diameter semiconducting (sc-) single-walled carbon nanotube (SWCNT) enrichment is focus this report. The based a simple three-step extraction process: (1) dispersion as-produced SWCNTs in PF solution; (2) centrifugation at low speed to separate enriched sc-tubes; (3) filtration collect sc-SWCNTs and remove excess polymer. effect conditions purity yield including molecular weight alkyl side-chain length...
Fully printed thin film transistors (TFT) based on poly(9,9-di-n-dodecylfluorene) (PFDD) wrapped semiconducting single walled carbon nanotube (SWCNT) channels are fabricated by a practical route that combines roll-to-roll (R2R) gravure and ink jet printing. SWCNT network density is easily controlled via formulation (concentration polymer:CNT ratio) jetting conditions (droplet size, drop spacing, number of layers). Optimum inkjet printing established Si/SiO2 in which an consisting 6:1...
A silver molecular ink platform formulated for screen, inkjet, and aerosol jet printing is presented. simple formulation comprising neodecanoate, ethyl cellulose, solvent provides improved performance versus that of established inks, yet with economics. Thin, screen-printed traces exceptional electrical (<10 mΩ/□/mil or 12 μΩ·cm) mechanical properties are achieved following thermal photonic sintering, the latter having never been demonstrated silver-salt-based inks. Low surface roughness,...
Additive manufacturing is the process of creating an object from a digital three-dimensional (3D) design using hardware that deposits and adds materials successively until desired formed. Vat polymerization type additive technique offers attractive strategy for fabricating 3D objects due to its high resolution, versatility feedstock materials, dimensional accuracy. However, ability spatially control placement multiple during vat limited by mechanical designs can restrict printing single...
ConspectusSemiconducting single-walled carbon nanotubes (sc-SWCNTs) are emerging as a promising material for high-performance, high-density devices well low-cost, large-area macroelectronics produced via additive manufacturing methods such roll-to-roll printing. Proof-of-concept demonstrations have indicated the potential of sc-SWCNTs digital electronics, radiofrequency circuits, radiation hard memory, improved sensors, and flexible, stretchable, conformable electronics. Advances toward...
Abstract 3D printing has enabled materials, geometries and functional properties to be combined in unique ways otherwise unattainable via traditional manufacturing techniques, yet its adoption as a mainstream platform for objects is hindered by the physical challenges multiple materials. Vat polymerization offers polymer chemistry-based approach generating smart objects, which phase separation used control spatial positioning of materials thus at once, achieve desirable morphological final...
Crystals of several new hybrid tin(II) iodide-based perovskites, involving 2,3,4,5,6- pentafluorophenethylammonium or phenethylammonium cation bilayers and intercalated aryl perfluoroaryl molecules, were grown by slow evaporation a methanol solution containing the perovskite intercalating species. The (C(6)F(5)C(2)H(4)NH(3))(2)SnI(4).(C(6)H(6)) structure was solved at -75 degrees C in monoclinic C2/c subcell [a = 41.089(12) A, b 6.134(2) c 12.245(3) beta 94.021(5) degrees, Z 4] consists...
Abstract A limitless‐length flexible active‐matrix implies that virtually any surface can be rendered into an interactive medium when laminated with electrophoretic or organic light‐emitting diode sheets. However, performance, cost, and size limitations of current fabrication technologies semiconducting materials, typically utilized in thin film transistor (TFT) active matrices (TFT‐AMs), have hindered progress, thus preventing the realization fully printed TFT‐AMs on a plastic roll. new...
Conjugated polymer extraction (CPE) has been shown to be a highly effective method isolate high-purity semiconducting single-walled carbon nanotubes (sc-SWCNTs). In both literature reports and industrial manufacturing, this enabled enrichment of sc-SWCNTs with high purity (≥99.9%). High selectivity is typically obtained in nonpolar aromatic solvents, yet polar solvents may provide process improvements terms yield, efficiency. Using an amphiphilic fluorene-alt-pyridine conjugated copolymer...
The release profile of ligands from copper formate complexes during thermal decomposition influences the morphology and electrical properties their films.
A novel purification process for the enrichment of sc-SWCNTs that combines selective conjugated polymer extraction (CPE) with adsorption using silica gel, termed hybrid-CPE (h-CPE), has been developed, providing a high purity sc-SWCNT material significant improvement in efficiency and yield. Using h-CPE protocol, greater than 5 fold yield can be obtained compared to traditional CPE while obtaining >99.9% as assessed by absorption spectroscopy Raman mapping. Thin film transistor devices...
High-purity semiconducting single-walled carbon nanotubes (sc-SWCNTs) are promising for portable and high-sensitivity gas sensors because of their excellent physical electrical properties. Here, we describe the synthesis a novel indigo-fluorene-based copolymer (PFIDBoc) that has been designed to selectively enrich sc-SWCNTs with purity (>99.9%) yet contain latent function in form tert-butoxy (t-BOC)-protected amine can be later revealed exploited dioxide (CO2) sensing. SWCNTs wrapped PFIDBoc...
The first conducting polythiophene, having only dendritic solubilizers, has been prepared using a Stille coupling approach. use of second and third generation aliphatic ether convergent dendrons as solubilizing platform facilitated the preparation dendrimer-oligothiophene hybrid macromonomers minimal substitution. Polymers were then via an A2 + B2 step-growth polymerization between oligothiophene−dibromide macromonomer 2,5-bis(trimethylstannyl)thiophene Pd(PPh3)2Cl2 catalyst. Both dendrimer...
The redox states of a series well-defined hybrid dendrimers based on oligothiophene cores and poly(benzyl ether) dendrons have been studied using cyclic voltammetry variable-temperature UV/visible/near-IR spectroscopy. oxidation potentials the electronic transitions neutral, singly oxidized, doubly oxidized these novel materials determined as function conjugation length varying between 4 17 repeat units. attachment dendritic wedges at termini lengthy oligothiophenes considerably enhances...
To determine the effects of weight loss on intramyocellular energy substrates, vastus lateralis muscle biopsies were taken from six obese subjects (body mass index 34 +/- 5 kg/m(2)) before, after 15 wk restriction (ER; -700 kcal/day), and a further average 20.7 1.6 endurance training plus low-fat diet (ET-LFD). Body fell 100 6 to 89 kg during ER 84 4 ET-LFD. Lipids glycogen histochemically measured in type I, IIA, IIB fibers. Total content (MGC; per fibers) decreased [from 72 13 55 8...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTWell-Defined Triblock Hybrid Dendrimers Based on Lengthy Oligothiophene Cores and Poly(benzyl ether) DendronsPatrick R. L. Malenfant, Lambertus Groenendaal, Jean M. J. FréchetView Author Information Department of Chemistry, University California Berkeley, 94720-1460 Cite this: Am. Chem. Soc. 1998, 120, 42, 10990–10991Publication Date (Web):October 9, 1998Publication History Received26 May 1998Published online9 October inissue 1...
Leptin acutely stimulates skeletal muscle fatty acid (FA) metabolism in lean rodents and humans. This stimulatory effect is eliminated following the feeding of high-fat diets as well obese The mechanism(s) responsible for development leptin resistance unknown; however, a role increased suppressor cytokine signaling-3 (SOCS3) inhibition receptor has been demonstrated other rodent tissues. Furthermore, whether exercise intervention an effective strategy to prevent or attenuate not...
Abstract Semiconducting single‐walled carbon nanotubes (sc‐SWCNTs) enriched by a conjugated polymer extraction process have been actively studied for various applications in both electronics and optoelectronics. Although the resulting tube samples usually high sc‐purity concentration, SWCNT networks from such dispersions typically contain residual that may degrade device performance its removal remains challenge while maintaining uniform, dense thin film networks. In this study, novel...