論文發表人: 陳常修 (加州大學爾灣校區/Department of Chemical Engineering & Materials Science)
混合導電高分子化合物可以建立微機電系統的機械結構,它不只具有良好的電性,同時也具有強韌的機械特性.它大幅的被應用於生醫領域及光電領域.PEDOT:PSS化合物是一個低電阻的導電高分子,而PVA化合物則是水溶性的混合添加劑,用來強化元件的結構.混合溶液利用旋轉塗佈的方式形成導電高分子薄膜.緊接著用四點探針的方式來測量交流電及直流電的電性,如導電強度.不同的導電強度可有不同的應用.機械強度方面,像是楊式係數或是拉申強度,可經由量測元件的共振強度而計算得知.高分子的楊式係數大約是1-5GPa.如此小的楊式係數可以進一步的縮小微機電元件或是其他方面的尺寸.導電高分子薄膜的導電強度隨著導電高分子化合物PEDOT:PSS增加而增加;PVA化合物則影響其機械強度從易脆到易延展的.此外,導電增強劑NMP化合物也混入此導電高分子系統讓此導電高分子薄膜導電性增加一百倍
The structure material of microelectromechanical systems (MEMS) has been built with two polymer blends Poly(3,4-ethlenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS) is a high conductivity polymer. And a water soluble non-conductive synthetic polymer, polyvinyl Alcohol (PVA), leads to increase tensile strength, durability and flexibility. Mixtures were prepared and spin coated to form thin films. The AC and DC electrical properties of the thin films are studied using the four point probe method. Studies of electrical properties will lead materials to different applications. And the mechanical properties, such as Young's Modulus and tensile strength of the thin films might be relative with resonance frequency. Young's Modulus of polymer blends are anticipated around 1-5GPa. These lower Young's Modulus polymers than metals can minimize the dimension of MEMS devices and other applications. The film conductivities increased proportional to the increase in conducting polymer PEDOT:PSS content. And thin films became ductile from brittle with increasing PVA content. In addition, (N-Methyl-2-pyrrolidinone), a conductivity enhancer, was introduced and resulted in an increase of the conductivity of the polymer blends with the order of 100
