Hassan Hammed H A M, Fattah Marwa Abdel, Maged Fatma Abdel
Chemistry department, Faculty of Science, Alexandria University, P.O. 2, Moharram Beck, Alexandria, 21568, Egypt.
Menoufia Higher Institute of Engineering and Technology MNF-HIET, Menoufia, Egypt.
BMC Chem. 2024 Apr 20;18(1):79. doi: 10.1186/s13065-024-01174-7.
We report the synthesis of sulfonated copolyaniline/polysafranin/L-ascorbic acid/Ag@SiO fine powdered nanocomposites and investigate the influence of incorporating the dye on their conductivity. The composite was characterized via IR, UV, cyclic voltammetry (CV), electric, dielectric, SEM, TEM, TGA and DSC measurements. Microscopy images revealed intensified spherical particles that were dispersed across the entire surface, and the SiO/Ag particles were distributed on the surface. The XRD results exhibited peaks at many 2q values, and their interatomic spacing (d) and crystallite (grain) sizes were calculated. The thermal degradation curves exhibited an interesting model of stability. The cyclic voltammogram exhibited redox peaks identical to those of the reported analogues. The d.c. conductivity of the oligomer varied from 0.06 - 0.016 (s/cm), and that of the composite varied from 0.008 to 0.016 (s/cm). The material changed from a semiconductor to a metallic material. The observed conductivity is mainly attributed to self-doping between the sulfonate groups and the charged nitrogen atoms in the polymer chains. The frequency dependence of the permittivity, ε', showed a marked effect on the frequency window under consideration. The permittivity, ε', is independent of the increase in the frequency of the oligomer and the composite. This behavior supports the non-Debye dependency by confirming the occurrence of electrode polarization and space charge effects. In conclusion, the incorporation of safranin dye with a thermally stable, highly sulfonated polyaniline derivative/Ag@SO nanocomposite achieved improved conductivity after heating. The d.c. conductivities are comparable to those of many commercial inorganic or organic composites, and because of their attractive electrical properties, we suggest that these materials are promising for electronic field applications.
我们报道了磺化聚苯胺/聚藏红花素/L-抗坏血酸/Ag@SiO细粉纳米复合材料的合成，并研究了掺入染料对其导电性的影响。通过红外光谱（IR）、紫外光谱（UV）、循环伏安法（CV）、电学、介电、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、热重分析（TGA）和差示扫描量热法（DSC）测量对该复合材料进行了表征。显微镜图像显示强化的球形颗粒分散在整个表面，且SiO/Ag颗粒分布在表面。X射线衍射（XRD）结果在多个2θ值处显示出峰，并计算了它们的原子间距（d）和微晶（晶粒）尺寸。热降解曲线呈现出有趣的稳定性模型。循环伏安图显示出与报道的类似物相同的氧化还原峰。低聚物的直流电导率在0.06 - 0.016（s/cm）之间变化，复合材料的直流电导率在0.008至0.016（s/cm）之间变化。该材料从半导体转变为金属材料。观察到的导电性主要归因于聚合物链中磺酸根基团与带电氮原子之间的自掺杂。介电常数ε'的频率依赖性在所考虑的频率窗口中显示出显著影响。介电常数ε'与低聚物和复合材料频率的增加无关。这种行为通过确认电极极化和空间电荷效应的发生来支持非德拜依赖性。总之，将藏红花素染料与热稳定、高度磺化的聚苯胺衍生物/Ag@SO纳米复合材料结合，在加热后实现了导电性的提高。直流电导率与许多商业无机或有机复合材料相当，并且由于其吸引人的电学性质，我们认为这些材料在电子领域应用中很有前景。
