Inkjet printing of Ce0.8Gd0.2O2 thin films on Ni-5%W flexible substrates
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The successful inkjet printing of a cerium gadolinium oxide (Ce0.8Gd0.2O2) precursor solution on highly textured Ni-5%W is reported. A stable ink was synthesised from metal acetates and propionic acid with rheological properties suitable for inkjet printing and also the development of solid–liquid interface comparable with thin film formation by dip coating. Two different drop-on-demand print heads were used for deposition: a 16-nozzle piezoelectric cartridge and a single electromagnetic nozzle. Two different rastering patterns with different droplet sizes and spacing were compared. Thermogravimetry and X-ray diffractometry were used to study the thermal decomposition of the metal oxide precursors and to determine the shortest possible heat treatment of the deposited layers, potentially suitable for continuous large scale production. The results from X-ray diffraction show that the single phase Ce0.8Gd0.2O2 was obtained in all cases, but only piezoelectric inkjet printing with optimised drop overlapping produces a highly textured buffer layer. Optical micrographs and atomic force microscopy also indicate the good quality of deposited films after heat treatment.
KeywordsInkjet printing Sol–gel Ce0.8Gd0.2O2 Thin films
The authors would like to thank Prof. Ian Hutchings (Inkjet Research Centre, Institute for Manufacturing, University of Cambridge) for access to the Dimatix Materials Printer and Dr. Mary Vickers (Department of Materials Science and Metallurgy, University of Cambridge) for help with pole figures. Mariusz Mosiadz would like to thank Dr. Nadia Stelmashenko (Department of Materials Science and Metallurgy, University of Cambridge) for help with atomic force microscopy. David Hardeman would like to thank Prof. Lindsay Greer (Department of Materials Science and Metallurgy, University of Cambridge) for the access to departmental facilities. This research was funded by the European Commission 6th Framework Programme (MRTN-CT-2006-035619), Marie Curie Actions, NESPA project (NanoEngineered Superconductors for Power Application) and partially supported by the European Commission 7th Framework Programme (EC-FP7-NMP-2007-SMALL-1) EFECTS (Efficient Environmental-Friendly Electro-ceramics Coating Technology and Synthesis).
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