Properties and structural investigation of one-dimensional SAM-ATP/PANI nanofibers and nanotubes

Core-shell one-dimensional (1D) conducting nanofibers were prepared by the encapsulation of attapulgite (ATP) template with polyaniline (PANI) after the surface modification with APTES to form a SAM on the surface of ATP needle-shaped particle (SAM-ATP), and the 1D PANI nanotubes were obtained by etching the SAM-ATP template with HCl/HF solution after the PANI layers were coated onto the SAM-ATP template. The room temperature conductivity and average specific capacitance of 1D 18.7 wt% SAM-ATP/PANI nanofibers (2.21 S/cm and 418 F/g) were increased compared with pure PANI (0.47 S/cm and 342 F/g) and PANI nanotubes (0.01 S/cm and 282 F/g). The conductivity stability and thermal stability of 1D 18.7 wt% SAM-ATP/PANI nanofibers were clearly improved. These trends were accompanied by significant structural changes as evidenced by TEM, FTIR, and XRD studies. (C) 2012 Elsevier B.V. All rights reserved.