Luceño-Sánchez José A, Charas Ana, Díez-Pascual Ana M
Universidad de Alcalá, Facultad de Ciencias, Departamento de Química Analítica, Química Física e Ingeniería Química, Ctra. Madrid-Barcelona Km. 33.6, 28805 Alcalá de Henares, Madrid, España (Spain).
Instituto de Telecomunicações, Instituto Superior Técnico, Av. Rovisco Pais, P-1049-001 Lisbon, Portugal.
Polymers (Basel). 2021 May 7;13(9):1503. doi: 10.3390/polym13091503.
Composite films based on conducting polymers and carbon nanomaterials have attracted much attention for applications in various devices, such as chemical sensors, light-emitting diodes (LEDs), organic solar cells (OSCs), among others. Graphene oxide (GO) is an ideal filler for polymeric matrices due to its unique properties. However, GO needs to be functionalized to improve its solubility in common solvents and enable the processing by low-cost solution deposition methods. In this work, hexamethylene diisocyanate (HDI)-modified GO and its nanocomposites with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) were developed, and their morphology, thermal, electrical, thermoelectrical and mechanical performance were characterized. The influence of the HDI functionalization degree and concentration on the nanocomposite properties were assessed. The HDI-GO increased the crystallinity, lamella stacking and interchain coupling of PEDOT:PSS chains. A strong improvement in electrical conductivity, thermal stability, Young's modulus and tensile strength was found, showing an optimum combination at 2 wt% loading. Drop and spin casting techniques were applied onto different substrates, and the results from deposition tests were analyzed by atomic force microscopy (AFM) and UV-vis spectroscopy. A number of parameters influencing the depositions process, namely solvent nature, sonication conditions and ozone plasma treatment, have been explored. This study paves the way for further research on conducting polymer/modified GO nanocomposites to optimize their composition and properties (i.e., transparency) for use in devices such as OSCs.
基于导电聚合物和碳纳米材料的复合薄膜在各种器件中的应用引起了广泛关注，这些器件包括化学传感器、发光二极管（LED）、有机太阳能电池（OSC）等。氧化石墨烯（GO）由于其独特的性能，是聚合物基体理想的填料。然而，GO需要进行功能化处理，以提高其在常用溶剂中的溶解度，并能够通过低成本的溶液沉积方法进行加工。在这项工作中，开发了六亚甲基二异氰酸酯（HDI）改性的GO及其与聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）的纳米复合材料，并对其形态、热性能、电性能、热电性能和机械性能进行了表征。评估了HDI功能化程度和浓度对纳米复合材料性能的影响。HDI-GO提高了PEDOT:PSS链的结晶度、片层堆积和链间耦合。发现电导率、热稳定性、杨氏模量和拉伸强度有显著提高，在2 wt%负载量时表现出最佳组合。将滴铸和旋涂技术应用于不同的基材上，并通过原子力显微镜（AFM）和紫外-可见光谱对沉积测试结果进行了分析。探索了影响沉积过程的一些参数，即溶剂性质、超声处理条件和臭氧等离子体处理。这项研究为进一步研究导电聚合物/改性GO纳米复合材料铺平了道路，以优化其组成和性能（即透明度），用于OSC等器件。
