Humidity dependent properties of a transparent conducting film doped with BEDO‐TTF complex

Abstract

Conducting reticulate doped polymer (RDP) films with transparent appearance were prepared by the two-step method. Polycarbonate films were doped with the bis(ethylenedioxy)tetrathiafulvalene (BEDO-TTF) complex of ReO À complexes showed quasi-reversible humidity dependent behaviors, in which the resistivity and interconducting-layer distance were increased and decreased, respectively, in dry atmosphere. The ReO 4 containing film exhibited better reversibility, while the existence of two kinds of crystal structures was proved for the Br complex.

On the Sensing Mechanisms of a Hydroresistive Flexible Film Based on an Organic Molecular Metal

“…This was done by forming polycrystalline layers of IRSs, derived from BEDT-TTF-based conductors, in nanocomposite bilayer (BL) filmsa strategy that allows combining electrical properties of IRSs with classical properties of insulating polymers, like flexibility, transparency, and processability. − Indeed, the high chemical tunability of BEDT-TTF-based IRSs in combination with the structural and electronic modifications of these IRSs responsive to external inputs has allowed to date fabricating a variety of sensor elements for strain, pressure, temperature, and IR radiation (bolometer) sensors. However, the development of sensor elements for RH with these IRSs is less mature, and only a few examples have been reported, without fully disentangling their sensing properties. − …”

“…The discovery of quasi-reversible modulation of electrical resistance depending on the RH in BL films composed of polycarbonate (PC) and hydrated molecular BEDT-TTF or BEDO-TTF [BEDO-TTF = bis­(ethylenedioxy)­tetrathiafulvalene] conductors − allows engineering a new type of organic material for the development of flexible humidity sensors. As already mentioned, the origin of charge transport changes under the influence of different RH levels in both BL films remains to be unraveled.…”

“…As already mentioned, the origin of charge transport changes under the influence of different RH levels in both BL films remains to be unraveled. Therefore, even though it was previously hypothesized that RH has a substantial impact on the IRS crystal structures, − playing an important role in charge transport, no direct experimental evidence with a systematic characterization and understanding is available. Here we report a detailed study of the influence of RH on the resistive properties of BL films composed of PC and halogenated IRSs derived from BEDT-TTF.…”

Preparation of environmentally resistant conductive silica-based polymer hybrids containing tetrathiafulvalene–tetracyanoquinodimethane charge-transfer complexes

“…27 Regulation of the radical concentration in the film through photopatterning and long-term storage of radical spins in the film have also been achieved, although conductivity was below the detection limit in these films. 28,29 In addition, it has been demonstrated that conductivity can be tuned by modulating the morphologies, 27 additives, 30 substituents, 31 moisture, 32 preparation conditions 33 and matrix type. 34,35 Finally, an improvement in conductivity compared with that of TTF crystals has been achieved through condensation of the TTF species at the film surface.…”

Processing and Performance of Polymeric Transparent Conductive Composites

“…In its partially oxidized state, the BEDO-TTF molecule has a tendency to self-aggregate via interactions in its peripheral heteroatoms. This results in the formation of a two-dimensional electronic structure, with metallic properties [15][16][17][18][19]. BEDO-TTF is of great interest in the design of organic superconductors, semiconductors, Langmuir-Blodgett films, crystalline organic metals, metal-like composites, biosensors, and soft electrodes [17,[20][21][22][23].…”