Thin Films of Prussian Blue: Sequential Assembly, Patterning and Electron Transport Properties at the Nanometric Scale

We present a new approach for patterning thin films of Prussian blue at the micro- and nanometric scales. In a first step, a resist was deposited on a gold surface and patterns were generated by photolithography or electron beam lithography. The Prussian blue with idealized formula of KFe^III[Fe^II(CN)₆] was deposited through the sequential exposure of the patterned surface to a series of solutions containing alternately absorbable Fe³⁺ cations and [Fe(CN)₆]⁴⁻ anions. These building blocks are gradually associated into dense and continuous films and patterned structures of Prussian blue can be obtained finally by lift-off. This approach was also used to deposit Prussian blue thin films on interdigitated nanoelectrodes and the current–voltage characteristics of this device were investigated.