Síntese e caracterização de nanofios de prata e óxido de grafeno rico em grupos hidroxila para aplicações em eletrônica orgânica

Abstract

In this work, the synthesis and characterization of Silver Nanowires (AgNWs) and Hydroxyl Group-rich Graphene Oxide (HGO) were carried out with the aim of manufacturing Transparent Conductive Electrodes (TCEs) from the combination of these two nanomaterials. The synthesis of HGO was prepared using a chemical route based on the modified Hummers’ method, followed by a chemical reduction process on the HGO, resulting in Reduced Graphene Oxide (rHGO). The synthesis of AgNWs was performed using a modified polyol method, and the samples of these nanomaterials were characterized by different spectroscopic techniques. Thin films of AgNWs and rHGO were fabricated and optimized separately, and hybrid films were then produced using different concentrations of AgNWs/rHGO colloids dispersed in ethanol and various deposition methods. Through electrical and optical characterizations, optimized hybrid films were obtained, showing sheet resistances of 1.08×101 Ohm/sq, with transmittance values of 83.57% at 550 nm. These are excellent results comparable to Indium Tin Oxide (ITO - Sn:In2O3), which has a sheet resistance between 1 × 101 Ohm/sq and 3 × 101 Ohm/sq and a transmittance above 90%, and is classified as a Transparent Conductive Oxide (TCO), widely used in Organic Electronics. Furthermore, the Figure of Merit (FOM) was calculated and presented a value of σDC/σOP = 186.40, indicating that the hybrid films perform significantly better than the industry standard, which is σDC/σOP > 35, showing a competitive alternative to traditional materials like ITO, and being promising for applications in flexible optoelectronic devices.