Synthesis of Core-Shell Conductivity Materials Using Supercritical Carbon Dioxide
Date Issued
2009
Date
2009
Author(s)
Huang, Ssu-Hao
Abstract
The conducting core-shell materials are formed using supercritical carbon dioxide as the solvent in this study. The effect of various sulfonic acids and operating conditions on the conductivity of the doping process are discussed. Poly(3,4-ethylenedioxythiophene) (PEDOT) has high conductivity, relatively high transparency and long-term stability. The materials are widely applied in light-emitting diode, solar cell, super capacitor and ion-selective organic transistor. The properties of nanocomposites can be altered by coating the particles with an outer shell that influences the final electrical, thermal and mechanical properties. The synthesis of organic (PEDOT) and inorganic (SiO2) nanocomposites are investigated in this study by applying the supercritical fluid technology. Unlike the conventional process with organic solvent, supercritical carbon dioxide was used as the solvent in this study to coat PEDOT onto the surface of nanosilica particles. The coating process was operated at different pressures, dopant concentrations and doping times. The optimal reaction condition are at 40℃, 280bar, reaction time of 48 hours and the molar ratio of 0.2 (DBSA/EDOT). The product is characterized by FTIR and TGA. The maximum coating percentage is 62.69 wt.％ under the optimal operation condition. The electrical property was analyzed by UV-vis and Four-Point Probe. The maximum conductivity is 6.7×10-2 S/cm. Core-Shell structure of the product was confirmed through the TEM image.
Subjects
Supercritical carbon dioxide
Nanocmposites
Core-Shell stucture
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-98-R96549028-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):b53c92c4058a502b74975421851e37cf