Abstract
Oxidative chemical vapor deposition (oCVD) is a versatile technique that can simultaneously tailor properties (e.g., electrical, thermal conductivity) and morphology of polymer films at the nanoscale. In this work, we report the thermal conductivity of nanoscale oCVD grown poly(3,4-ethylenedioxythiophene) (PEDOT) films for the first time. Measurements as low as 0.16 W m−1 K−1 are obtained at room temperature for PEDOT films with thicknesses ranging from 50–100 nm. These values are lower than those for solution processed PEDOT films doped with the solubilizing agent PSS (polystyrene sulfonate). The thermal conductivity of oCVD grown PEDOT films show no clear dependence on electrical conductivity, which ranges from 1 S cm−1 to 30 S cm−1. It is suspected that at these electrical conductivities, the electronic contribution to the thermal conductivity is extremely small and that phonon transport is dominant. Our findings suggest that CVD polymerization is a promising route towards engineering polymer films that combine low thermal conductivity with relatively high electrical conductivity values.
Highlights
Oxidative chemical vapor deposition is a versatile technique that can simultaneously tailor properties and morphology of polymer films at the nanoscale
The thermal conductivity of Oxidative chemical vapor deposition (oCVD) grown PEDOT films show no clear dependence on electrical conductivity, which ranges from 1 S cmÀ1 to 30 S cmÀ1
Our findings suggest that chemical vapor deposition (CVD) polymerization is a promising route towards engineering polymer films that combine low thermal conductivity with relatively high electrical conductivity values
Summary
Oxidative chemical vapor deposition (oCVD) is a versatile technique that can simultaneously tailor properties (e.g., electrical, thermal conductivity) and morphology of polymer films at the nanoscale. Molecular scale engineering tools like chemical vapor deposition (CVD) are the workhorses of the microfabrication industry With these primarily inorganic thin lm coating technologies, we can achieve multifunctional properties on the surface of a material which are different from those of the underlying substrate. CVD polymerization is a new technique that merges CVD thin lm processing with the versatility of organic chemistry This vapor phase polymerization offers a facile, solventfree and low temperature route to simultaneously tune chemistry, morphology and functionality,[1] allowing for creative ways to engineer multiscale (thicknesses from nano to micro) and multifunctional (insulating, semiconducting, conducting) polymer lms on a variety of substrates including paper, plastic, and biological tissue.[1]. Solution processing techniques may be widespread, realizing nanoscale lm thicknesses will o en lead to non-uniformity due to dewetting and surface tension effects that accompany solution processes
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