Ernst Minder

Transparent electrically conductive composite materials: Methods of preparation and their application

One possibility to obtain transparent, electrically conductive materials is the crystallization of conducting charge-transfer-complexes (CT-complexes) in a polymer matrix in the form of needle-or dendrite-like structures. With tetraselenotetracene chloride ((TSeT)2Cl), a radical cation salt, as electroconductive filler, we have access to a thermally stable, highly conductive material, with values of the bulk conductivity of the composite material up to 1 S/cm at a loading of the conductive complex below 1 %(w/w). n nThe preparation of such composite structures as free standing (cast) films and in the form of very thin coated layers is presented and their electrical, optical and mechanical properties are discussed. In addition we show their potential use for display electrodes, transparent heating elements, and for antistatic applications.

Synthesis, superconductivity and X-ray data of the complex of the non symmetrical 4,5-d4-4′,5′-h4-BEDT-TTF with copper rhodanide

Abstract The specific synthesis of the non symmetrical donor 4,5-d 4 -4′5′-h 4 -Bis-(ethylenedithio)-TTF (d 4 ,h 4 -BEDT-TTF) and some preliminary structural data and physical properties of its κ-complex with Cu(SCN) 2 are described.

Transparent electrically conductive composites by in situ crystallization of (TSeT)2Cl in a polymer matrix

A new chemical pathway was found which offers access to the thermostable, highly conductive tetraselenotetracene chloride radical cation salt (TSeT)2Cl. This pathway allows the in-situ crystallization of (TSeT)2Cl in a vitrifying polymer matrix. So highly conductive films (σ= 1–5 Scm-1) with networks of (TSeT)2Cl crystallites of a 1: 1000 aspect ratio could be prepared at a fairly low percolation threshold of 0.4 – 1.6 % w/w. These films show metallic conductivity behavior in the 60 – 400 K range.