Low Thermal Conductivities of Undoped and Various Protonic Acid-Doped Polyaniline Films

Abstract

Thermal conductivities of undoped and various protonic acid-doped polyaniline films were measured by combination of a laser flash method and a scanning differential calorimeter. The thermal conductivities thus measured are in the range of conventional organic polymers, indicating that the doped polyaniline films have extremely low thermal conductivities among electrically conductive materials.

Silicon shadow mask fabrication for patterned metal deposition with microscale dimensions using a novel corner compensation scheme

“…An exact comparison to others' polyaniline data is difficult given that various film synthesis conditions can significantly alter thermal transport characteristics. Nonetheless, this value is of the same order of magnitude as the reported value of ∼0.29 W/m K at 300 K by Yan et al for a polyaniline film of unknown thickness [34].…”

Stretched Polyaniline Films Doped by (±)-10-Camphorsulfonic Acid: Anisotropy and Improvement of Thermoelectric Properties

“…Consequently the thermoelectric power factor (S 2 r) and figure-of-merit (ZT) of the stretched polyaniline film are significantly anisotropic and higher than that of unstretched counterpart, as shown in Figure 1. In the calculation of ZT the thermal conductivity of an unstretched film [3] is used because the thermal conductivity has not been observed to increase due to the increase of the electrical conductivity of polyaniline films. [3] It is worth to note that the thermal conductivity of stretched films in the stretching direction could slightly increase due to the increasing degree of crystallization.…”

“…In the calculation of ZT the thermal conductivity of an unstretched film [3] is used because the thermal conductivity has not been observed to increase due to the increase of the electrical conductivity of polyaniline films. [3] It is worth to note that the thermal conductivity of stretched films in the stretching direction could slightly increase due to the increasing degree of crystallization. However, a measurement of the thermal conductivity failed methodologically at this stage.…”

“…Previously we have reported an improvement of the thermoelectric performance of highly electrically conductive polyaniline by multilayered structures [2] and extremely low thermal conductivity of protonic acids-doped polyaniline films. [3] The polyaniline films were not comparable with best conventional inorganic thermoelectric materials like Bi 2 Te 3 yet, but comparable with FeSi 2 in terms of the thermoelectric figure-of-merit (ZT). [4] These results indicate that polyaniline, one of the electrically conducting organic polymers, could be a candidate for feasible thermoelectric materials for cooling semiconductor chips as long as a further improvement of the ZT to sufficient values is achievable.…”

Polymerization of Aniline Using Iron(III) Catalyst and Ozone, and Kinetics of Oxidation Reactions in the Catalytic System

“…Polyaniline, one of the most promising conductive polymers, has been investigated for such applications as optical displays, [1] organic polymer batteries, [2] antistatic and electromagnetic shielding materials, [3] and thermoelectric materials [4,5] for past decades. Commonly polyaniline is chemically synthesized using ammonium peroxodisulfate as an oxidant.…”