Arenas M C, Andablo E, Castaño V M
Departamento de Ingeniería Molecular de Materiales, Centro de Física Aplicada y Tecnología Avanzada, UNAM, Blvd. Juriquilla 3001, Querétaro, 76230, México.
J Nanosci Nanotechnol. 2010 Jan;10(1):549-54. doi: 10.1166/jnn.2010.1721.
Conducting polyaniline nanofibers (nf-PANI) were successfully synthesized by simple polymerization of aniline in presence of single and binary dopant agents. Strong hydrochloride acid (HCl), two weak organic acids (poly acrylic acid, PAA, 2-acrylamido-2-methyl-1-propanesulfonic acid, AMPSA) and one anionic surfactant (sodium dodecyl sulfate, SDS) were used to form the binary dopant agents. The binary dopant agent PAA modified the morphology of the single doped PANI, whereas AMPSA and SDS modified the dimensions of the nanofibers: the length size single nanofibers is reduced 1.72 times with binary-doped AMPSA and increased by a factor of 0.7 with SDS. The surface roughness of the films decreases when the dimensions of the nanofibers increase: PANI-SDS film is flatter than PANI-AMPSA film. In general, the conductivity of the single-doped PANI nanofibers (nf-PANI-HCl) was improved by one order of magnitude with binary dopant agents (HCI-PAA, HCl-AMPSA, HCl-SDS). The influence of the binary dopant agents in the nf-PANI-HCl properties is analyzed by Transmission Electron Microscope (TEM), Atomic Force Microscopy (AFM), UV-VIS absorption spectra, thermogravimetric analysis (TGA) and Fourier-Transform infrared spectra (FT-IR).
通过在单一和二元掺杂剂存在下对苯胺进行简单聚合，成功合成了导电聚苯胺纳米纤维（nf-PANI）。使用强盐酸（HCl）、两种弱有机酸（聚丙烯酸，PAA；2-丙烯酰胺基-2-甲基-1-丙烷磺酸，AMPSA）和一种阴离子表面活性剂（十二烷基硫酸钠，SDS）来形成二元掺杂剂。二元掺杂剂PAA改变了单掺杂聚苯胺的形态，而AMPSA和SDS改变了纳米纤维的尺寸：二元掺杂AMPSA使单根纳米纤维的长度尺寸减小了1.72倍，而SDS使其增加了0.7倍。当纳米纤维尺寸增加时，薄膜的表面粗糙度降低：PANI-SDS薄膜比PANI-AMPSA薄膜更平整。总体而言，二元掺杂剂（HCl-PAA、HCl-AMPSA、HCl-SDS）使单掺杂聚苯胺纳米纤维（nf-PANI-HCl）的电导率提高了一个数量级。通过透射电子显微镜（TEM）、原子力显微镜（AFM）、紫外-可见吸收光谱、热重分析（TGA）和傅里叶变换红外光谱（FT-IR）分析了二元掺杂剂对nf-PANI-HCl性能的影响。
