Layered Ultrathin Proton Conductive Film Based on Polymer Nanosheet Assembly
Layered Ultrathin Proton Conductive Film Based on Polymer Nanosheet Assembly
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DOI：
10.1021/am200252y
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发表时间：
2011-05-01
影响因子：
9.5
通讯作者：
Miyashita, Tokuji
中科院分区：
文献类型：
--
作者：
Matsui, Jun;Miyata, Hiromu;Miyashita, Tokuji
如本文所述，使用聚（N-十二烷基丙烯酰胺-co-2-丙烯酰胺基-2-甲基丙磺酸）（p（DDA/AMPS））聚合物纳米片制备了分层超薄质子导电膜。表面压-面积等温线表明p（DDA/AMPS）在空气-水界面形成稳定的单分子膜。使用Langmuir-Blodgett技术将聚合物单层转移到固体基底上。对30层p（DDA/AMPS）多层膜的X射线衍射分析表明，薄膜具有清晰的Kiessing条纹和一个Bragg峰，表明多层膜具有均匀的层状结构。单分子层厚度测定为距布拉格峰1.85 nm。研究了p（DDA/AMPS）聚合物纳米片沿层平面方向的质子导电性随温度和相对湿度的变化。多层膜的质子传导率在100%RH和20 ℃下为1 × 10（-5）S/cm的量级，在70 ℃下增加到1 × 10（-2）S/cm。由于多层膜中通过亲水区域形成了均匀且连续的亲水纳米通道，多层膜的质子电导率比旋涂膜的质子电导率高出10倍以上。
As described in this paper, a layered ultrathin proton conductive film was prepared using a poly(N-dodecylacrylamide-co-2-acrylamido-2-methylpropanesulfonic acid) (p(DDA/AMPS)) polymer nanosheet. The surface pressure-area isotherm revealed that p(DDA/AMPS) formed a stable monolayer at the air-water interface. The polymer monolayer was transferred onto a solid substrate using the Langmuir-Blodgett technique. X-ray diffraction measurements of a 30-layer film of p(DDA/AMPS) showed clear kiessing fringes and once Bragg peak, which indicate that the multilayer film took a uniform layered structure. The monolayer thickness was determined as 1.85 nm from the Bragg peak. The proton conductivity of p(DDA/AMPS) polymer nanosheet through the layer plane direction was studied with changing temperature and relative humidity. The proton conductivity of the multilayer film was on the order of 1 x 10(-5) S/cm at 100% RH with 20 degrees C and increased to 1 x 10(-2) S/cm at 70 degrees C. The proton conductivity of the multilayer film showed a more than 10 times higher value than that of the spin-coated film because of the formation of a uniform and consecutive hydrophilic nanochannel through the hydrophilic region in the multilayer film.