Reddy Kakarla Raghava, Lee Kwang-Pill, Gopalan Anantha Iyenger
Department of Chemistry Graduate School, Kyungpook National University, Daegu 702-701, South Korea.
J Nanosci Nanotechnol. 2007 Sep;7(9):3117-25. doi: 10.1166/jnn.2007.692.
Poly(ortho-toluidine) (POT)-gold (Au) and palladium (Pd) composite nanospheres were successfully synthesized by the reaction of o-toluidine with the corresponding metal (Au or Pd) colloidal solution through self-assembly process in the presence of dodecylbenzenesulfonic acid (DBSA), which acts as both a dopant and surfactant, and ammonium peroxydisulfate as an oxidizing agent. The composites (POT-DBSA/Au or Pd) were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, UV-Visible (UV-Vis) spectroscopy, and electrical conductivity measurements. TEM images of the nanocomposites reveal that metal (Au or Pd) nanoparticles were well dispersed on POT spheres. TGA and XRD results show that the composites exhibit high thermal stability and are more crystalline compared with pristine POT. It was found that the electrical conductivity of the POT-DBSA/Au or Pd composites is 2 orders of magnitude higher than that of pristine polymer. Also, the POT-DBSA/Pd composite exhibits magnetic property. The formation mechanism of the POT-DBSA/Au or Pd composite nanosphere is discussed.
通过邻甲苯胺与相应的金属（金或钯）胶体溶液在十二烷基苯磺酸（DBSA）存在下进行自组装反应，成功合成了聚（邻甲苯胺）（POT）-金（Au）和钯（Pd）复合纳米球。其中，DBSA既作为掺杂剂又作为表面活性剂，过硫酸铵作为氧化剂。通过透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X射线衍射（XRD）、热重分析（TGA）、傅里叶变换红外（FTIR）光谱、紫外可见（UV-Vis）光谱和电导率测量对复合材料（POT-DBSA/Au或Pd）进行了表征。纳米复合材料的TEM图像显示，金属（Au或Pd）纳米颗粒很好地分散在POT球上。TGA和XRD结果表明，与原始POT相比，复合材料具有高热稳定性且结晶度更高。发现POT-DBSA/Au或Pd复合材料的电导率比原始聚合物高2个数量级。此外，POT-DBSA/Pd复合材料具有磁性。讨论了POT-DBSA/Au或Pd复合纳米球的形成机理。
