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Bimodal Latex Effect on Spin Coated Thin Conductive Polymer SWCNT Layers.

08:00 EDT 22nd October 2015 | BioPortfolio

Summary of "Bimodal Latex Effect on Spin Coated Thin Conductive Polymer SWCNT Layers."

Two differently sized latexes are synthesized by emulsion polymerization and mixed with a sonicated single wall carbon nanotube (SWCNT) dispersion to prepare a 3% SWCNT composite mixture. The mixture is spin coated at various spin speed rates and times over a glass substrate in order to make a thin transparent conductive layer. The weight fraction of the 30 nm relative to 70 nm sized p(MMA-co-t-BA) latex particles is varied, while the amount of SWCNTs is kept constant. We find a maximum in the electrical conductivity upto 370 S/m, depending on the solid content and spin speed and time, when the coating is prepared at 3-5% of the smaller latex particles. We also find a more than two fold increase in conductivity measuring parallel to the radius of spin coating relative to perpendicular to that. Atomic Force Microscopy (AFM) points at the existence of lanes of latex particles in the spin coated thin layer, while large area Transmission Electron Microscopy (TEM) shows that the SWCNTs are aligned over a spin coated grid fixed on the same samples. The conductivity pattern on the surface is extracted by correlated data and translated into the direction of the SWCNTs in the thin layer.

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This article was published in the following journal.

Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827
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