Quasicrystal-Filled Polymers Outperforms Other Polymer Composite in Wear-Resistance Properties
- PDF / 834,576 Bytes
- 2 Pages / 612 x 792 pts (letter) Page_size
- 45 Downloads / 140 Views
semiconductors become viable, and standard solution-processing techniques can be used. In this study the researchers investigated devices made from pentacene, PTV, and P3HT. Electrodes and interconnect lines were photochemically patterned on glass or 50-µm thick polyimide foils using 200-nm thin polyaniline (PANI) films. A 300-nm thick layer of commercially available photoresist compound was deposited on the first layer by spincoating, creating the gate dielectric and insulation for the interconnect lines. Contact holes were
masked into the photoresist layer. Finally, the source and drain electrodes were masked into the top PANI layer; after spincoating, a low-ohmic via (typically < 1 kΩ) formed between the top source and drain electrodes of one transistor and the bottomgate electrode of another. Top-gate devices fabricated for comparison using the same methods yielded vias with resistance values in the MΩ range. The pentacene transistors gave the best results, with mobilities in the range of 1 × 10-2 cm2/Vs, versus 3 × 10-3 for P3HT and 1 × 10-3 for PTV. A programma-
Cost-Effective Portable Spin Coaters Two-Stage Spinning • Dispense liquid during Stage 1 • Spin-up and flatten during Stage 2 Adjustable Speed Stage 1 • 500 to 2,500 rpm • 2 to 18 seconds Stage 2 • 1,000 to 8,000 rpm • 3 to 60 seconds
Precision Dip Coaters Robust Laboratory Coater • Easy to operate • Speed range of 0 to 30 cm per minute • Adjustable travel span • Controllable atmosphere • Curing chamber • Custom fabrication Coating Solutions • Available for metal oxides, nitrides and carbides Distributorships Available
CHEMAT TECHNOLOGY, INC. 9036 Winnetka Avenue, Northridge, CA 91324 U.S. Toll-Free 800-475-3628 • Non-U.S. 818-727-9786 Fax: 818-727-9477 • E-mail: [email protected] www.chemat.com
ble code generator was fabricated combining over 300 transistors and 200 vias to form a clock-generator, a 5-bit counter, a decoder logic function, and 15 program pads in one integrated circuit. Again, the pentacene device performed best, achieving a transmission rate of 100 bit/s. Further research to improve the shelf life of these organic semiconductors is needed before practical devices can be achieved. TIM PALUCKA
Quasicrystal-Filled Polymers Outperforms Other Polymer Composite in Wear-Resistance Properties Valerie Sheares, a researcher at Ames Laboratory and assistant professor of chemistry specializing in polymer research at Iowa State University, has combined quasicrystals and polymers in a composite that outperforms similar materials in wear-resistance tests. In addition to the improved performance of the polymers, the composite offers a more versatile way of using quasicrystalline powders, which could make the materials more appealing to industry. “It’s a unique material,” said Sheares, who has applied for a patent on the quasicrystal-filled polymers. “It’s very hard, it’s not abrasive, and it has low thermal conductivity.” To determine whether the wear-resistant properties of quasicrystals had transferred to the composite, half-dollar-sized disks
Data Loading...
