Electrical Properties Of Plasma-polymerized Thin Organic Films

The electrical properties of plasma-polymerized films are summarized and compared to those of conventional polymers. Particular attention is devoted to the dielectric relaxation, dielectric breakdown, electric conductivity and photoconductivity, and their control via control of the plasma parameters. © 1983 Plenum Publishing Corporation

Biomedical Applications Of Plasma Polymerization And Plasma Treatment Of Polymer Surfaces

Thin polymer films obtained by plasma polymerization usually show good biocompatibility when compared to classical biomaterials such as Silastic. The thicknesses of these films (from several hundreds of Å to several μm) make them suitable for the purpose of changing the surface properties of the substrate without altering its bulk properties. Both the above features together indicate the possible Biomedical use of plasma polymerization as well as plasma treatment of polymer surfaces processes. The purpose of this review is to present the most significant efforts to develop such applications with the specification of particular fields where these efforts are directed. © 1982

Feasibility of Organo-Beryllium Target Mandrels Using Organo-Germanium PECVD as a Surrogate

Inertial Confinement Fusion capsules incorporating beryllium are becoming attractive for use in implosion experiments designed for modest energy gain. This paper explores the feasibility of chemical vapor deposition of organo-beryllium precursors to form coating materials of interest as ablators and fuel containers. Experiments were performed in a surrogate chemical system utilizing tetramethylgermane as the organometallic precursor. Coatings with up to 60 mole percent germanium were obtained. These coatings compare favorably with those previously reported in the literature and provide increasing confidence that a similar deposition process with an organo-beryllium precursor would be successful

Role of geometry, substrate and atmosphere on performance of OFETs based on TTF derivatives

Abstract We report a comparative study of OFET devices based on zone-cast layers of three tetrathiafulvalene (TTF) derivatives in three configurations of electrodes in order to determine the best performing geometry. The first testing experiments were performed using SiO 2 /Si substrates. Then the optimum geometry was employed for the preparation of flexible OFETs using Parylene C as both substrate and dielectric layer yielding, in the best case, to devices with μ FET = 0.1 cm 2 /Vs. With the performed bending tests we determined the limit of curvature radius for which the performance of the OFETs is not deteriorated irreversibly. The investigated OFETs are sensitive to ambient atmosphere, showing reversible increase of the source to drain current upon exposition to air, what can be explained as doping of TTF derivative by oxygen or moisture

Polimery ksylilenowe - niezwykłe tworzywa wielkocząsteczkowe

Red. serii : Wodziński, PiotrHaving been discovered in the forties and developed in the sixties of the twentieth century, poly(xylylenes) owe their current technological interest to the progress made in microtechnology. Mainly known under the trade name of Parylene, xylylene polymers constitute a separate class of polymeric materials. This is due to the fact that they are produced in the form of thin surface coatings, resulting from a chemical vapor deposition process and from its vacuum polymerization/deposition variant in particular. There are several well established industrial applications of poly(xylylenes ), among which protection of electronic circuitry (printed board circuits, hybrid circuits, etc.) against the environmental effects is stili the major one. Apart from that, xylylene polymers are being applied as coatings for ferrite cores, rear earth magnets, elastomer products and, first of all, for various biomedical appliances. Currently developed applications in microtechnology comprise various microfluidic microelectromechanical systems (microscopic pumps, valves, flow meters, chromatographic columns, etc.) as well as organie semiconductor devices, such as organie field effect transistors, organie light emitting diodes, and even entire active matrix displays. The book offers a comprehensive, monographic description of xylylene polymers. lt begins with a review of historical developments, leading to the discovery of xylylene and its polymer. lt then describes the Union Carbide process of Parylene manufacture. Succesive chapters are devoted to the mechanism of poly(p-xylylene) synthesis, to the structure of xylylene polymers and to the spectroscopy of these materials. Finally, the last two chapters deal with their utility properties and with their applications. Particular attention is given to the most modern applications of poly(p-xylylenes), namely those in the area of microtechnology