Solution-processed multifunctional transparent conductive films based on long silver nanowires/polyimide structure with highly thermostable and antibacterial properties

Abstract

Flexible transparent films that have excellent photoelectric properties, mechanical and thermal stability, and antibacterial properties, are highly desirable for applications in flexible and wearable electronics. Multifunctional transparent conductive films (TCFs) with long silver nanowires (AgNWs, average length = 80 μm and average diameter = 88 nm)/transparent polyimide (PI) structures which were fabricated by using a facile, scalable, environmentally-friendly, and full-solution process, can satisfy all the requirements above. The AgNW/PI composite films show excellent opto-electrical properties (e.g., 7.5 ohm sq⁻¹, at 81.1% transmittance) and mechanical flexibility across a wide temperature range, from room temperature to 300 °C. The AgNW networks were embedded into the transparent PI film surface, which could decrease the surface roughness (R_rms < 2.0 nm), and enhance the composite films' resistance to peeling, fracture, and oxidation, which expands the range of TCF applications considerably. Additionally, in exploring promising applications, the function of the transparent heater and the antibacterial properties of the composite films were also studied. These characteristics make the composite films excellent candidates for substrates for flexible and wearable electronic devices.