title: Template-free fabrication and thermoelectric properties of pbse modified poly(p-phenylenediamine) nanowires.
abstract: In this paper, we presented a template-free method to prepare poly(p-phenylenediamine) (PpPD) nanowires. PpPD nanowires were synthesized by chemical oxidative polymerization in aqueous solution, using ammonium persulfate as initiator and beta-naphthalenesulfonic acid as soft template. The obtained polymer powder was treated with Pb(NO3)2 and Na2SeSO3 solutions in sequence to form PbSe nanoparticle modified PpPD. The products were characterized by X-ray powder diffraction, infrared spectroscopy, and transmission electron microscopy, respectively. The thermoelectric properties of the powders after cold pressing were measured at room temperature. The pure dedoped PpPD nanowires exhibited very large Seebeck coefficient (2692 microV K(-1)) but very low electrical conductivity. As the PbSe content increased, the electrical conductivity of the PbSe/PpPD composite increased, whereas the Seebeck coefficient decreased, and the power factor monotonically increased. The sample with 41.5 wt% PbSe had a highest power factor, 0.189 microW m(-1) K(-2) which is -270 times as large as that of the pure PpPD nanowires (8.7 x 10(-4) microW min(-1) K(-2)).
authors: Functional Materials Research Laboratory, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors: Yuanyuan
authors: Y
authors: Wang
authors: Kefeng
authors: K
authors: Cai
authors: Xi
authors: X
authors: Yao