Electrochemical control of the elution property of Prussian blue nanoparticle thin films: mechanism and applications

Abstract

We found a method for controlling the elution property of a thin film of water-dispersible Prussian blue (w-PB) nanoparticles using a simple electrochemical treatment. The thin film of the w-PB nanoparticles fabricated by the spin-coating method was unstable in water and eluted easily. However, after electrochemical reduction and oxidation, the film did not elute in water. To clarify the mechanism, we investigated films using ultraviolet-visible absorption spectroscopy, X-ray photoemission spectroscopy, and atomic force microscopy. We propose herein that the change in the elution property occurs because of alkali cation exchange from Na(+) to K(+). We also demonstrated that this elution-control technique is effective for the fabrication of w-PB nanoparticle nanostructures such as multilayered thin films.

Cellulose nanofiber backboned Prussian blue nanoparticles as powerful adsorbents for the selective elimination of radioactive cesium

“…These observations signify the presence of C-N ([Fe (CN) 6 ]) in the CNF/PB complex. On the basis of the higher resolution spectral analysis of the N1s and Fe 2p spectra we conclude that the PB particle was successfully identified even with CNF as its backbone525354. The caging of the cesium ion in CNF/PB is mainly due to an ion-exchange between the water molecules and/or the monovalent cations from the crystal lattice of PB.…”

Electrochromic device with Prussian blue and HPC-based electrolyte

“…This procedure performed soon after PB electrodeposition is called stabilization of the film [24,25], and is important for the PB good adhesion properties to the ITO substrate [26]. As an example, Comparing these values with some other ECDs that contain natural-polymer-based electrolytes it can be stated that they are very similar to T = 35% registered for the ECD with glass/ITO/WO3/agar-CH3COOH/CeO2-TiO2/ITO/glass configuration [28].…”

A Complementary Electrochromic Device with Highly Improved Performance Based on Brick-Like Hydrated Tungsten Trioxide Film

“…The single PB layer device shows obvious broad optical modulation between bleached and colored states, especially in the range of 470 nm to 850 nm, similar to the reports. [41][42][43][44] The complementary device depicts a comparable high transmittance level at bleached state, indicating a highly transparent state of as-grown H-WO 3 films. When the device is colored, lower transmittance in the whole range is achieved, resulting from the complementary color contrast of H-WO 3 films.…”