Influence of Topology on Performance of Organic Electrochemical Transistor

Organic electrochemical transistors (OECTs) with two topologies and three ionic liquid electrolytes were analyzed to get information about their influence on the selected transistor’s characteristics. The channel of the OECT device was based on conductive polymer poly(3,4-ethylenedioxy-thiophene) poly(styrene sulfonate) (PEDOT:PSS). Dynamic characteristics were measured and analyzed. From the results follow that in the case of the double GATE configuration both the rise and decay current components contain diffusion contribution which limits the use of OECT in switching applications. Besides the influence of the OECT topology, the used electrolytes significantly affect transistors characteristics. Ionic liquid 1-butyl-3-methylimidazolium trifluoromethane-sulfonate (BMIM OTf) exhibited the best performance among the other tested ILs based on methylimidazolium

液晶性アゾ色素を側鎖に有するポリウレタン薄膜における光誘起表面レリーフグレーティングの形成

The formation of the photoinduced surface relief grating (SRG) on the film of polyurethane containing liquid-crystalline azobenzene in the side chain has been studied. The peak of absorbance of the azo-polymer used in this study is around 360 nm, which is shorter than that of other azo-polymer, such as Disperse Red based, which has been mainly studied so far, and fabrication of SRG with short pitch can be performed using UV light source. Thermal stability of the formed SRG was investigated and discussed on the basis of the glass transition temperature.液晶性を示すアゾ色素を側鎖に有するポリウレタン薄膜に、UVレーザーの二光束を干渉させ照射することにより、表面レリーフグレーティングを作製した。他に多くの報告例があるディスパースレッドを側鎖に有するアゾ高分子に比べ、吸収のピークが360run付近と短波長であり、光源に短波長なUVレーザーを使用できる分、周期の細かいグレーティングが作製可能となる。また、作製された表面レリーフグレーティングの熱的安定性についても評価し、高分子のガラス転移点に基づく議論も行った