研究目的
Investigating the effects of varying the concentration of the oxidant on the particle sizes and doping levels of PEDOT-Tos for thermoelectric applications, and demonstrating that an increase in oxidant concentration expands particle sizes and doping levels, providing an alternative approach to optimize the power factor.
研究成果
The study demonstrates that increasing the oxidant concentration in PEDOT-Tos synthesis expands particle sizes and doping levels, leading to increased electrical conductivity but decreased Seebeck coefficient, offering a simpler alternative to reduction agents for optimizing thermoelectric properties, though performance is limited without base agents.
研究不足
The synthesis was performed without inhibitors like pyridine, which may limit electrical conductivity and oxidation levels; solubility issues prevented molecular weight analysis; particle size and oxidation level measurements have uncertainties; and the power factor achieved was low compared to literature values.
1：Experimental Design and Method Selection:
The study involved synthesizing PEDOT-Tos through in situ polymerization with varying concentrations of iron(III) p-toluenesulfonate hexahydrate oxidant (1, 10, 20, 40, 60, and 80 wt% in n-butanol), followed by characterization of electrical conductivity, Seebeck coefficient, particle size, and oxidation levels.
2：Sample Selection and Data Sources:
Samples were prepared by adding EDOT monomer to oxidant solutions, coated on glass substrates via spin-coating, and polymerized at 100°C for 5 minutes. Powders were also prepared for analysis.
3：List of Experimental Equipment and Materials:
Equipment included spin-coater, four-point probe setup, thermoelectric cooler stages, thermocouples, NMR spectrometer (Advance DSX 300 MHz, Bruker), TEM (FEI Tecnai G2 Sphera), SAXS diffractometer (XENOCS FOX2D), XPS (Kratos), DLS (DynaPro NanoStar, Wyatt Technology), UV-Vis-NIR spectrometer, and atomic absorption spectroscopy. Materials included EDOT, iron(III) p-toluenesulfonate hexahydrate, n-butanol, sodium p-toluenesulfonate, DMSO, and glass substrates.
4：Experimental Procedures and Operational Workflow:
Synthesis involved mixing EDOT with oxidant solutions, spin-coating, polymerization, washing with n-butanol to remove by-products, and characterization using the listed techniques to measure electrical conductivity, Seebeck coefficient, particle size via DLS and TEM, oxidation levels via XPS and NMR, and optical properties via UV-Vis-NIR.
5：Data Analysis Methods:
Data were analyzed using standard methods for each technique, including fitting SAXS data with GNOM program, calculating Seebeck coefficients from voltage and temperature differences, and statistical analysis of measurements.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
