Dielectric constant and breakdown field studies of electrostatic self-assembled materials

Abstract

Electrical properties of electrostatic self-assembled (ESA) films were investigated using a conductive polymer and metal bar. These nanostructured polymeric films were fabricated on gold-coated glass slides using the ESA method. The thicknesses of the films were in the range 120-630 nm, and the films were obtained by depositing numbers of bilayers of negatively charged Poly s-119 (PS-119) or heparin and positively charged Poly(diallyldimethylammonium chloride) (PDDA). Measurement electrodes were fabricated on the ESA films using conductive silver grease and a brass bar. Capacitance measurements were conducted to determine the dielectric constant of the ESA films over various temperature and frequency ranges at 1 mV and 15% relative humidity, while electric field breakdown tests were performed at 1000 Hz, 15% relative humidity and varying temperatures and voltages. The test results showed that dielectric constant values were between 1.8 and 2.4 and breakdown field values were approximately 9 kV mm −1 . Based on the test results, it is concluded that this is a technique that might prove useful in estimating the capacitance, dielectric constant and breakdown field values of nanostructured ESA films.

Pentacene thin film transistors with a poly(methyl methacrylate) gate dielectric: Optimization of device performance

“…These values agree well with other literature reports. 4,6,9,14 The C versus V characteristics, measured at 1 MHz and a voltage scan rate of 1 V s −1 , of two Al/PMMA/pentacene/Au metal-insulator-semiconductor ͑MIS͒ structures are shown in Fig. 7.…”

Antennas on quasi synthetic media

“…Since a "lightweight binder" like Polyfoam which has a dielectric constant of 1.05 [17] is used in the analysis in [10], 1 can be approximated to 0 .…”

Nanocoatings for corrosion protection of aerospace alloys

“…corrosion, biological, optical, electrical, tribological, thermal, magnetic and electrostatic) of the materials and also to protect the surface from environmental effects. 40,42 LBL fi lms can be applied easily to clean surfaces. For instance, a negatively charged substrate that is dipped into a solution containing cationic polyelectrolytes (e.g.…”

“…poly(diallyldimethylammonium chloride)-PDDA), which are attracted to the anionic surface, self-assembles into a single layer of molecules. 42 The resulting physical, chemical and physicochemical properties indicate that the molecular order of such individual bilayers is nearly perfect, in much the same way that the electrical charge on a free-conducting surface distributes itself uniformly over the surface in order to minimize the total system energy. 40 Subsequent anionic (e.g., polystyrene-119) and cationic monolayers are added in bilayer pairs, by alternately dipping the substrate into those positively and negatively charged solutions, to produce a multilayer nanostructured fi lm.…”

“…40 Subsequent anionic (e.g., polystyrene-119) and cationic monolayers are added in bilayer pairs, by alternately dipping the substrate into those positively and negatively charged solutions, to produce a multilayer nanostructured fi lm. 42 LBL coating provides a simple barrier against corrosive species in the same way as a conventional organic coating. A recent study revealed that the nanoclaybased LBL coatings exhibit very high corrosion protection on aluminum and Al alloys because of the molecular nature of the LBL system.…”