Aziz Dara Muhammed, Hassan Sangar Ali, Aziz Shujahadeen B
Department of Chemistry, College of Science, University of Raparin, Rania, Kurdistan of Iraq, Iraq.
Hameed Majid Advanced Polymeric Materials Research Lab, Physics Department, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani, Kurdistan Regional Government, 46001, Iraq.
Sci Rep. 2024 Aug 5;14(1):18122. doi: 10.1038/s41598-024-65792-w.
In this study, conducting polymers composed of polyaniline hydrochloric acid (PANI/HCl) with varying concentrations of a newly synthesized azo-azomethine dye (4-(((Z)-2-hydroxy-5-((Z)-(4-hydroxyphenyl)diazenyl)-3-methoxybenzylidene)amino)benzoic acid) were synthesized using a chemical oxidative polymerization technique. The synthesized azo-azomethine was characterized by FTIR, H-NMR, C-NMR, and HRMS. The effects of varying the concentration of the dopant azo-azomethine in PANI/HCl on its optical, structural, thermal, and electrical properties were examined using FTIR, UV-Vis, XRD, FESEM, TEM, cyclic voltammetry, and electrical impedance spectra. The results indicate that the optical, direct, and indirect band gaps of the doped polymers decreased from 4.48 and 3.96 eV to 3.91 and 2.49 eV, respectively. The crystalline structure and phase transitions in the doped polymers were examined using X-ray diffraction. Cyclic voltammetry demonstrated that the doped polymers exhibited higher electrochemical conductivity compared to the pure polymer, with the specific capacitance increasing from 161.17 to 816.9 F/g. The electrical impedance spectra revealed the bulk resistance and conductivity of the material. Among all the doped polymers, PANI/HCl with an azo-azomethine concentration of 5 × 10 M exhibited lower bulk resistance (10 Ω) and higher electrical conductivity (σ = 50.09 × 10 S cm).
在本研究中，采用化学氧化聚合技术合成了由聚苯胺盐酸盐（PANI/HCl）与不同浓度新合成的偶氮 - 偶氮甲碱染料（4 - （（（Z） - 2 - 羟基 - 5 - （（Z） - （4 - 羟基苯基）重氮基） - 3 - 甲氧基亚苄基）氨基）苯甲酸）组成的导电聚合物。通过傅里叶变换红外光谱（FTIR）、氢核磁共振（H - NMR）、碳核磁共振（C - NMR）和高分辨率质谱（HRMS）对合成的偶氮 - 偶氮甲碱进行了表征。使用FTIR、紫外 - 可见光谱（UV - Vis）、X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）、循环伏安法和电阻抗谱研究了PANI/HCl中掺杂剂偶氮 - 偶氮甲碱浓度变化对其光学、结构、热学和电学性质的影响。结果表明，掺杂聚合物的光学带隙、直接带隙和间接带隙分别从4.48和3.96电子伏特降至3.91和2.49电子伏特。使用X射线衍射研究了掺杂聚合物中的晶体结构和相变。循环伏安法表明，与纯聚合物相比，掺杂聚合物表现出更高的电化学导电性，比电容从161.17增加到816.9F/g。电阻抗谱揭示了材料的体电阻和电导率。在所有掺杂聚合物中，偶氮 - 偶氮甲碱浓度为5×10⁻³M的PANI/HCl表现出较低的体电阻（10Ω）和较高的电导率（σ = 50.09×10⁻³S/cm）。
