一种合成聚苯胺纳米球的简便方法及其掺杂对其电导率的影响。
A facile method for synthesis of polyaniline nanospheres and effect of doping on their electrical conductivity.
作者信息
Neelgund Gururaj M, Oki Aderemi
机构信息
Department of Chemistry, Prairie View A&M University, Prairie View TX 77446, USA.
出版信息
Polym Int. 2011 Sep;60(9):1291-1295. doi: 10.1002/pi.3068.
The synthesis of polyaniline (PANI) nanospheres by a simple template-free method has been described. The polymerization of aniline in aqueous medium was accomplished using ammonium persulfate without any protonic acid. The UV-vis spectrum of PANI nanospheres displayed the characteristic absorption peak of π-π* transition of the benzenoid ring at 355 nm. The oxidation state of PANI nanospheres was identified with FT-IR spectroscopy by comparing the two bands at 1582 (ring stretching in quinoid unit) and 1498 cm(-1) (ring stretching in bezenoid unit). The X-ray diffraction patterns demonstrated the low crystalline nature of PANI nanospheres. The morphology of PANI nanospheres was spherical and the mean diameter of nanospheres was found in the range of 3-12 nm. The thermal behavior of PANI nanospheres was studied by thermogravimetric analysis. The effect of doping of HCl and H(2)SO(4) on PANI nanospheres was studied by measuring the current as a function of time of exposure. The high electrical conductivity of 6×10(-2) S cm(-1) was obtained for PANI nanospheres at their optimum doping state by 100 ppm HCl.
已描述了通过一种简单的无模板方法合成聚苯胺（PANI）纳米球。在水性介质中使用过硫酸铵完成苯胺的聚合，无需任何质子酸。PANI纳米球的紫外可见光谱在355 nm处显示出苯环π-π*跃迁的特征吸收峰。通过比较1582 cm⁻¹（醌式单元中的环伸缩）和1498 cm⁻¹（苯式单元中的环伸缩）处的两个谱带，用傅里叶变换红外光谱法确定了PANI纳米球的氧化态。X射线衍射图谱表明PANI纳米球的结晶性较低。PANI纳米球的形态为球形，纳米球的平均直径在3至12 nm范围内。通过热重分析研究了PANI纳米球的热行为。通过测量电流随暴露时间的变化，研究了HCl和H₂SO₄掺杂对PANI纳米球的影响。通过100 ppm HCl在其最佳掺杂状态下，PANI纳米球获得了6×10⁻² S cm⁻¹的高电导率。
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