Electrochromic Thin Film of Water-Dispersible Prussian-Blue Nanoparticles

Ayako OMURA  Hirofumi SHIOZAKI  Shigeo HARA  Tohru KAWAMOTO  Akihito GOTOH  Masahito KURIHARA  Masaomi SAKAMOTO  Hisashi TANAKA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.12   pp.1887-1888
Publication Date: 2008/12/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.12.1887
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on The Forefront of 21st Century Organic Molecular Electronics)
Category: Materials & Devices
Keyword: 
Prussian-blue,  nanoparticle,  electrochromism,  thin film,  electrochemical quartz crystal microbalance (EQCM),  

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Summary: 
The insoluble Prussian-blue (PB) pigment becomes possible to disperse in aqueous solution by covering their surfaces with ferrocyanide anions. The thin film fabricated with these water-dispersible PB nanoparticles shows evident electrochromic color changes between +0.8 V to -0.4 V on an ITO substrate. The mass change of the thin film during an electrochemical reaction is measured by means of electrochemical quartz crystal microbalance (EQCM). According to the EQCM analysis, the filling rate of water-dispersible PB nanoparticles in the film is 37.7% as compared with an assumed perfect crystal PB film.