Ghazy Ahmed R, Kenawy El-Refaie, Darwesh Nourhan, Shendy S, El-Shaer Abdelhamid, Ghazy R
Laser Laboratory, Physics Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt.
Polymer Research Group, Department of Chemistry, Faculty of Science, Tanta University, Tanta, 31527, Egypt.
Sci Rep. 2024 Nov 16;14(1):28336. doi: 10.1038/s41598-024-79758-5.
The optical, photoluminescence, and electrical properties of Poly(Z)-PTI and Poly(E)-PTI, two Poly-Pyrrol-Thiazol-Imine polymers with comparable chemical structures but distinct configurations, were examined. Using the dip-casting method, polymer films were deposited on ITO substrates. UV-VIS spectroscopy revealed that both polymers diverged between 500 and 800 nm, showing the impact of molecular arrangement, but showed similar absorption behavior for wavelengths shorter than 500 nm. For Poly(Z)-PTI, the direct optical energy gaps were 2.06 eV, while for Poly(E)-PTI, they were 1.78 eV. Poly(Z)-PTI displayed an emission peak at 610 nm (red) according to laser photoluminescence spectra, while Poly(E)-PTI peaked at 563 nm (green-yellow). The capacitance behavior was revealed by electrochemical impedance spectroscopy. Nyquist plots suggested an equivalent circuit model of R (CR)(QR)(CR) for both polymers, and the relaxation times were 15.9 ns for Poly(Z)-PTI and 89.5 ns for Poly(E)-PTI. The Mott-Schottky analysis verified the n-type conductivity, revealing 2.18 × 10 cm carrier densities for Poly(Z)-PTI and 1.78 × 10 cm for Poly(E)-PTI. At lower frequencies, both polymers exhibited limited conductivity and large dielectric constants. Insights into the possible uses of Poly-Pyrrol-Thiazol-Imine polymers in electrical and optoelectronic devices are provided by this study, which emphasizes the influence of molecular configuration on these polymers' characteristics.
研究了聚（Z）-PTI和聚（E）-PTI这两种化学结构相似但构型不同的聚吡咯-噻唑-亚胺聚合物的光学、光致发光和电学性质。采用浸铸法将聚合物薄膜沉积在ITO衬底上。紫外-可见光谱表明，两种聚合物在500至800nm之间存在差异，显示出分子排列的影响，但在波长小于500nm时表现出相似的吸收行为。对于聚（Z）-PTI，直接光学能隙为2.06eV，而对于聚（E）-PTI，其为1.78eV。根据激光光致发光光谱，聚（Z）-PTI在610nm（红色）处显示发射峰，而聚（E）-PTI在563nm（绿黄色）处达到峰值。通过电化学阻抗谱揭示了电容行为。奈奎斯特图表明两种聚合物的等效电路模型均为R（CR）（QR）（CR），聚（Z）-PTI的弛豫时间为15.9ns，聚（E）-PTI的弛豫时间为89.5ns。莫特-肖特基分析验证了n型导电性，聚（Z）-PTI的载流子密度为2.18×10cm，聚（E）-PTI的载流子密度为1.78×10cm。在较低频率下，两种聚合物均表现出有限的导电性和较大的介电常数。本研究提供了对聚吡咯-噻唑-亚胺聚合物在电气和光电器件中可能用途的见解，强调了分子构型对这些聚合物特性的影响。
