Roll-to-Roll Production of Prussian Blue/Pt Nanocomposite Films for Flexible Gasochromic Applications

Abstract A high-quality gasochromic (GC) platinum nanoparticle/Prussian blue (PtNP/PB) nanocomposite film was produced for the first time by roll-to-roll (R2R) production for high-throughput processing. Wettability was improved when a small amount of hydroxypropyl cellulose (HPC) was mixed with the PB ink, as confirmed by the decrease in the contact angle from 70.9° to 51.7°. SEM images revealed a significant difference between spin and R2R coating methods and also recognized the change in the morphology due to the HPC polymers. However, because of the non-conductive property of the HPC additive, the PB film resistance and GC performance and stability were also affected by the amount of HPC in the film. The analyses of these characteristics and long-term film stability for 1000 cycles were conducted through in-situ UV-visible spectroscopy and electrochemical cyclic voltammetry.