State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China.
Key Laboratory of Rubber-Plastics, Ministry of Education , Qingdao University of Science & Technology , Qingdao 266042 , P. R. China.
ACS Appl Mater Interfaces. 2019 Oct 16;11(41):38169-38176. doi: 10.1021/acsami.9b13336. Epub 2019 Oct 7.
Anisotropic composite films of polyaniline (PANI) with single-walled carbon nanotube (SWCNT) were prepared by in situ electropolymerization on highly oriented high-density polyethylene (HDPE) films. Polarized UV-vis and Raman spectra confirm the anisotropic arrangement of PANI molecular chains in the composite films. The conductivities of 16.6 ± 0.2 and 2.07 ± 0.2 S cm have been obtained for doped PANI/0.8 wt % SWCNT measured along and perpendicular to the direction of the HDPE molecular chain, respectively. The response of PANI/0.8 wt % SWCNT films used as ammonia sensors is much higher along the chain direction of HDPE than that perpendicular to the chain direction of HDPE with an anisotropic ratio of 1.8 at 100 ppm ammonia. This is attributed to the well-ordered array of PANI/0.8 wt % SWCNT induced by the oriented HDPE films. Moreover, the high ammonia response for PANI/0.8 wt % SWCNT may be attributed to the charge-transfer effect between PANI and SWCNT.
在高度取向高密度聚乙烯（HDPE）薄膜上通过原位电化学聚合制备了具有单壁碳纳米管（SWCNT）的各向异性聚苯胺（PANI）复合薄膜。偏振紫外可见和拉曼光谱证实了复合薄膜中 PANI 分子链的各向异性排列。掺杂 PANI/0.8wt%SWCNT 的电导率分别沿和垂直于 HDPE 分子链方向测量，得到 16.6±0.2 和 2.07±0.2 S cm。用作氨传感器的 PANI/0.8wt%SWCNT 薄膜在 100 ppm 氨时沿 HDPE 分子链方向的响应远高于垂直于 HDPE 分子链方向的响应，各向异性比为 1.8。这归因于取向 HDPE 薄膜诱导的 PANI/0.8wt%SWCNT 的有序排列。此外，PANI/0.8wt%SWCNT 对高氨的响应可能归因于 PANI 和 SWCNT 之间的电荷转移效应。
