Effect of heating temperature on Ag nanofiber formation via self-reduction of Pt nanoparticle-doped AgNO₃/PVA nanofibers

Silver nanofiber (Ag NF)-percolated networks have been widely utilized in the development of flexible transparent electrodes, transparent heaters, energy-saving devices, and electromagnetic interference shielding materials. Ag NFs with high aspect ratios substantially decrease the number density required for percolation, resulting in qualitatively superior transparent conducting networks. However, the mass production of Ag NFs with high aspect ratios is challenging. Recently, we developed a cost-effective method for the rapid mass production of Ag NFs that involves only two steps: blow spinning a self-reducing solution to generate precursor NFs, followed by heating treatment in air. However, the current utilization of high heating temperatures limits the choice of optional substrate materials. In this study, we investigate the effect of heating temperature on the self-reduction process and explore the possibility of lowering the heating temperature to rapidly produce Ag NFs. We observe that Ag NFs obtained at different heating temperatures exhibit similar microstructures, fiber diameters, compositions, and sheet resistances. In addition, we quantitatively analyze the self-reduction durations at different heating temperatures and examine the causes of failure of the self-reduction process at specific temperatures. The insights gained in lowering the heating temperature will contribute to broadening the range of suitable substrate materials and promoting energy conservation.