Inkjet-printed silver-nanoparticles on nano-engineered cellulose films for electrically conducting structures and organic transistors – concept and challenges
Updated: 2012-10-17 | Print
a Paper and Fibre Research Institute (PFI), Høgskoleringen 6b, NO-7491 Trondheim, Norway.
b Physics, Department of Natural Sciences and Center for Functional Materials, Åbo Akademi University, Porthansgatan 3, FI- 20500 Turku, Finland.
This study explores the suitability of microfibrillated cellulose (MFC) films as a substrate for printing electrically conductive structures and multilayer electronic structures such as organic field effect transistors (OFET). Various MFC qualities were tested, including mechanically produced MFC, 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) pre-treated MFC and carboxymethylated-MFC. The films differed significantly with respect to the surface structure. In addition, the carboxymethylated-MFC films were surface modified with hexamethyldisilazane (HMDS) in order to reduce the water-wettability of the films and thus improve the print resolution of the inkjet printed silver (Ag) nanoparticles. The Ag-particles (diameter <50 nm) were printed on the HMDS-modified films, which were mainly composed of nanofibrils with diameters less than 20 nm. The effect of surface roughness and surface chemical characteristics on the ink spreading and print resolution of the Ag-structures was explored. It was demonstrated that organic transistors operating at low voltages can be fabricated on nano-engineered MFC films.