功能磺酸掺杂聚苯胺的电导率及其光谱特征研究

Study on Conductivity and Spectra of Polyaniline Doped with Functional Sulfonic Acids

合成了十二烷基苯磺酸(DBSA)、磺基水杨酸(SSA)和对甲苯磺酸(TSA)掺杂的导电聚苯胺样品:PANI／DBSA,PANI／SSA,PANI／TSA。用四探针法测定其电导率,研究不同功能磺酸掺杂对聚苯胺电导率的影响,分析它们的FT-IR光谱、UV-VIS光谱吸收及NIR光谱反射现象及其变化。结果表明,功能磺酸掺杂剂的对阴离子尺寸大小影响其掺杂PANI的电导率和光谱特征,PANI/DBSA的对阴离子尺寸大于PANI／SSA,PANI／TSA,其电导率、FT-IR和UV-VIS图谱红移量都相对PANI／SSA,PANI／TSA大。同时不同功能磺酸掺杂聚苯胺的NIR光谱反射率为:PANI／DBSA>PANI／SSA>PANI／TSA。

Polyaniline doped with 4-dodecyl benzenesulfonic acid (DBSA), sulfo-salicylic acid (SSA) and 4-methyl benzesulfonic acid (TSA) were synthesized and labeled as PANI/DBSA, PANI/SSA and PANI/TSA. Their conductivity were measured with the method of four-probe, and the influence of different functional acids on electric conductivity of polyaniline doped with them was studied. The FT-IR and UV-VIS spectra were analyzed. The result shows that the conductivity and the spectra of PA-NI doped with functional acids were effected by the counter-anion of the dopants. The counter-anion's size of DBSA is bigger than that of SSA and TSA, and its conductivity, shifting of FT-IR and UV-VIS spectra were more stronger than the two others'. The reflectivity of NIR is the same as PANI/ DBSA >PANI/SSA> PANI/TSA.