Preparation of electrochromic Prussian blue nanoparticles dispersible into various solvents for realisation of printed electronics

Abstract

An insoluble solid of historic Prussian blue (PB) was transformed into dispersible PB nanoparticles in water and various hydrophilic and hydrophobic organic solvents. Via hybrid surface modification using Na 4 [Fe II (CN) 6 ] and short-chain alkylamines, the insoluble PB was successfully dispersed in hydrophilicand-hydrophobic boundary alcohols, such as n-butanol. The n-butanol-dispersible PB nanoparticles afforded homogeneous spin-coated thin films on various substrates. The chemisorbed shorter-chain alkylamines, n-propylamines, of the PB nanoparticles were thermally released at 100 °C from their surfaces to present stubborn electrochromic PB thin films adhering to the substrate via mutual coordination-bonding networks.

New faces of porous Prussian blue: interfacial assembly of integrated hetero-structures for sensing applications

“…165 The challenge is to print well-defined nano/micro-structures from dilute solution with materials, especially for insoluble materials. 167 In this study, they adopted a combination of two types of modifications on the surface Fe(III)-OH 2 sites of each insoluble PB nanoparticle using [Fe II (CN) 6 ] 4À and alkylamines to control their hydrophilic and hydrophobic nature (Fig. In the development of greener printed electronics using PB inks, hydrophilic and hydrophobic boundary alcohols are suitable candidates as solvents because of their moderate boiling points, volatilities, and viscosities.…”

Grain‐Boundary‐Free Super‐Proton Conduction of a Solution‐Processed Prussian‐Blue Nanoparticle Film

“…TheS AM substrate was immersed in the aqueous dispersion solution of the PB NPs,a nd am ono-particle film was spontaneously formed on the substrate (Figure 1b). In our strategy,1 )the surface Fe III sites of each NP are partially modified by [Fe II (CN) 6 ] 4À (Figure 1a and Figure S4);2 )the unmodified Fe III sites are utilized to connect with the SAM ( Figure S5);3 )asa lready reported, [17,18] …”

“…[14][15][16] In the NP films, electron/hole and ion conduction pathways are discontinuous throughout the innumerable grain boundaries among the NPs;t herefore,v arious low-temperature technologies to restore the conduction pathways [14] have been invented via the formation of new metal-bonding, [16] coordination (covalent)-bonding [17,18] networks,a nd p-junction [19] among the NPs.W ehave also demonstrated aspin-coating technique to provide large-area films of Prussian blue (PB) and its analogs (PBA) using dispersion solutions of their NPs: [17] ac ommon electrode system, i.e., the spin-coated NP film on an indiumtin-oxide (ITO) substrate in contact with an electrolyte solution, exhibited the electrochromic [15,18] and electronrectification [17] phenomena by the restoration of coordination-bonding networks.I nt his study,w ea dopt an ew electrode system non-contact with electrolyte solutions (Figure 1) to explore proton-conduction performance of as olutionprocessed film of the NPs via comparison experiments with that of as olution-processed Nafion film, [20] and we report as elf-restoration phenomenon of hydrogen-bonding networks disordered in innumerable grain boundaries among the NPs. [14][15][16] In the NP films, electron/hole and ion conduction pathways are discontinuous throughout the innumerable grain boundaries among the NPs;t herefore,v arious low-temperature technologies to restore the conduction pathways [14] have been invented via the formation of new metal-bonding, [16] coordination (covalent)-bonding [17,18] networks,a nd p-junction [19] among the NPs.W ehave also demonstrated aspin-coating technique to provide large-area films of Prussian blue (PB) and its analogs (PBA) using dispersion solutions of their NPs: [17] ac ommon electrode system, i.e., the spin-coated NP film on an indiumtin-oxide (ITO) substrate in contact with an electrolyte solution, exhibited the electrochromic [15,18] and electronrectification [17] phenomena by the restoration of coordination-bonding networks.I nt his study,w ea dopt an ew electrode system non-contact with electrolyte solutions (Figure 1) to explore pro...…”

Radioactive cesium decontamination technology for ash

“…2. At AIST, the development of a PB type complex has been conducted jointly with Yamagata University from 2005, [21] [22] with particular emphasis on the development of electrochromic devices. [23]- [26] Before the accident at Fukushima, we had been involved in R&D of a system for electrochemically adsorbing/desorbing and concentrating radioactive cesium.…”