Characterization of electroplated bismuth-tin alloys for electrically conducting materials

AbstractIonically conducting materials containing PEO were prepared from telechelic di(methyl-diethoxy-silane) PEO, synthesized by the hydrosilylation of telechelic diallyl-PEO with methyldiethoxysilane. The network is obtained by the usual sol-gel chemistry. Then, it is filled with LiClO4 by diffusion of the salt and further drying. A comparison is made with the same kind of materials crosslinked using urethane chemistry. Diffusion studies show that the diffusion coefficient of solvent is similar for both types of materials, whilst the ionic conductivity is higher for the networks crosslinked with siloxane bonds. An experiment of diffusion of LiClO4 without solvent showed that this salt has a diffusion coefficient of the order of 2.10-8 cm2.sec-1 at 34°C. The conductivity calculated from this determination is compatible with the mechanism of lithium cation transport by the diffusion of salt molecules. Elasticity modulus measurements show that the salt aggregates are essentially located within the crosslinks at low concentration, but also in the PEO chains for salt concentrations higher than 1 mol/l.

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Effective Doping of Single-Walled Carbon Nanotubes with Polyethyleneimine

Materials ◽

10.3390/ma14010065 ◽

2020 ◽

Vol 14 (1) ◽

pp. 65

Author(s):

Monika Rdest ◽

Dawid Janas

Keyword(s):

Carbon Nanotubes ◽

Technological Progress ◽

Single Walled Carbon Nanotubes ◽

Performance Limits ◽

Operational Parameters ◽

Single Walled Carbon ◽

Electrically Conducting ◽

Conducting Materials ◽

Walled Carbon Nanotubes ◽

Synthesis Stage

More and more electrically conducting materials are required to sustain the technological progress of civilization. Faced with the performance limits of classical materials, the R&D community has put efforts into developing nanomaterials, which can offer sufficiently high operational parameters. In this work, single-walled carbon nanotubes (SWCNTs) were doped with polyethyleneimine (PEI) to create such material. The results show that it is most fruitful to combine these components at the synthesis stage of an SWCNT network from their dispersion. In this case, the electrical conductivity of the material is boosted from 249 ± 21 S/cm to 1301 ± 56 S/cm straightforwardly and effectively.

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Electrical percolation in extrinsically conducting, poly(ε-decalactone) composite neural interface materials

Scientific Reports ◽

10.1038/s41598-020-80361-7 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Katarzyna Krukiewicz ◽

James Britton ◽

Daria Więcławska ◽

Małgorzata Skorupa ◽

Jorge Fernandez ◽

...

Keyword(s):

Silver Nanowires ◽

Electrochemical Characteristics ◽

Electrical Percolation ◽

Electrically Conducting ◽

Biomedical Device ◽

Conducting Materials ◽

Bidirectional Communication ◽

Polyester Matrix ◽

Electrical Percolation Threshold

AbstractBy providing a bidirectional communication channel between neural tissues and a biomedical device, it is envisaged that neural interfaces will be fundamental in the future diagnosis and treatment of neurological disorders. Due to the mechanical mismatch between neural tissue and metallic neural electrodes, soft electrically conducting materials are of great benefit in promoting chronic device functionality. In this study, carbon nanotubes (CNT), silver nanowires (AgNW) and poly(hydroxymethyl 3,4-ethylenedioxythiophene) microspheres (MSP) were employed as conducting fillers within a poly(ε-decalactone) (EDL) matrix, to form a soft and electrically conducting composite. The effect of a filler type on the electrical percolation threshold, and composite biocompatibility was investigated in vitro. EDL-based composites exhibited favourable electrochemical characteristics: EDL/CNT—the lowest film resistance (1.2 ± 0.3 kΩ), EDL/AgNW—the highest charge storage capacity (10.7 ± 0.3 mC cm− 2), and EDL/MSP—the highest interphase capacitance (1478.4 ± 92.4 µF cm−2). All investigated composite surfaces were found to be biocompatible, and to reduce the presence of reactive astrocytes relative to control electrodes. The results of this work clearly demonstrated the ability of high aspect ratio structures to form an extended percolation network within a polyester matrix, resulting in the formulation of composites with advantageous mechanical, electrochemical and biocompatibility properties.

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