Electrically driven PEDOT/PSS actuators
Electrically driven PEDOT/PSS actuators
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DOI：
10.1117/12.847385
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发表时间：
2009-11
期刊：
影响因子：
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通讯作者：
H. Okuzaki;K. Hosaka;H. Suzuki;T. Ito
中科院分区：
文献类型：
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作者：
H. Okuzaki;K. Hosaka;H. Suzuki;T. Ito
通过浇注其胶体颗粒的水分散体制备了由聚(4-苯乙烯磺酸)掺杂的聚(3,4-乙撑二氧噻吩)(PEDOT/PSS)制成的自支撑薄膜。通过吸附等温线和机电分析研究了所得薄膜的比表面积、水蒸气吸附和电活性聚合物驱动行为。结果发现，比表面积为 0.13 m2 g-1 的无孔 PEDOT/PSS 薄膜在相对水蒸气压为 0.95 时，吸附水蒸气量为 1080 cm3(STP) g-1，相当于 87 wt%。温度从25°C升高到40°C降低了吸附度，表明是放热过程，其中等量吸附热随着水蒸气吸附的增加而降低，该值达到43.9 kJ mol-1，与水的冷凝热（44 kJ mol-1）一致。施加 10 V 电压后，薄膜在 50% 相对湿度 (RH) 的空气中收缩 2.4%，在 90% RH 时收缩显着增加到 4.5%。其原理是通过焦耳加热使薄膜中吸附的水蒸气解吸，其中电场能够控制水蒸气吸附的平衡。
Free-standing films made of poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT/PSS) were prepared by casting water dispersion of its colloidal particles. Specific surface area, water vapor sorption, and electroactive polymer actuating behavior of the resulting films were investigated by means of sorption isotherm, and electromechanical analysis. It was found that the non-porous PEDOT/PSS film, having a specific surface area of 0.13 m2 g-1, sorbed water vapor of 1080 cm3(STP) g-1, corresponding to 87 wt%, at relative water vapor pressure of 0.95. A temperature rise from 25 to 40 °C lowered sorption degree, indicative of an exothermic process, where isosteric heat of sorption decreased with increasing water vapor sorption and the value reached 43.9 kJ mol-1, being consistent with the heat of water condensation (44 kJ mol-1). Upon application of 10 V, the film underwent contraction of 2.4% in air at 50% relative humidity (RH) which significantly increased to 4.5% at 90% RH. The principle lay in desorption of water vapor sorbed in the film due to Joule heating, where electric field was capable of controlling the equilibrium of water vapor sorption.