Department of Chemistry and Materials Science, Tokyo Institute of Technology, 2-12-1, Ookayama, Tokyo 152-8552, Japan.
ACS Appl Mater Interfaces. 2012 Sep 26;4(9):4891-7. doi: 10.1021/am3012214. Epub 2012 Aug 28.
Patterned carbon nanotube (CNT)/acrylic resin composite films were prepared using microcontact printing (μCP). To prepare ink for μCP, CNTs were dispersed into propylene glycol monomethyl ether acetate (PGMEA) solution in which acrylic resin and a commercially available dispersant (Disperbyk-2001) dissolved. The resulting ink were spin-coated onto poly(dimethylsiloxane) (PDMS) stamps. By drying solvent components from the ink, CNT/polymer composite films were prepared over PDMS stamps. Contact between the stamps and glass substrates provided CNT/polymer composite patternings on the substrates. The transfer behavior of the CNT/polymer composite films depended on the thermal-treatment temperature during μCP; thermal treatment at temperatures near the glass-transition temperature (T(g)) of the acrylic resin was effective to form uniform patternings on substrates. Moreover, contact area between polymer and substrates also affect the transfer behavior. The CNT/polymer composite films showed high electrical conductivity, despite the nonconductivity of polymer components, because CNTs in the films were interconnected. The electrical conductivity of the composite films increased as CNT content in the film became higher; as a result, the composite patternings showed almost as high electrical conductivity as previously reported CNT/polymer bulk composites.
采用微接触印刷（μCP）制备了图案化的碳纳米管（CNT）/丙烯酸树脂复合膜。为了制备用于μCP 的油墨，将 CNT 分散在丙二醇甲醚乙酸酯（PGMEA）溶液中，其中溶解了丙烯酸树脂和市售的分散剂（Disperbyk-2001）。所得油墨旋涂在聚二甲基硅氧烷（PDMS）印章上。通过从油墨中干燥溶剂成分，在 PDMS 印章上制备 CNT/聚合物复合膜。印章与玻璃基板之间的接触在基板上提供了 CNT/聚合物复合图案。CNT/聚合物复合膜的转移行为取决于μCP 过程中的热处理温度；在接近丙烯酸树脂玻璃化转变温度（Tg）的温度下进行热处理，有利于在基板上形成均匀的图案。此外，聚合物和基板之间的接触面积也会影响转移行为。尽管聚合物成分不导电，但由于薄膜中的 CNT 相互连接，因此 CNT/聚合物复合膜表现出高导电性。复合膜的电导率随着薄膜中 CNT 含量的增加而增加；因此，复合图案的电导率几乎与之前报道的 CNT/聚合物整体复合材料一样高。
