  GdxCe1-xO2-d (GDC) nanoparticles were synthesized, using continuous
hydrothermal flow synthesis. By varying the synthesis conditions, particle size
and morphology could be tailored. Here, particle sizes between 6 and 40 nm with
polyhedral or octahedral shape could be obtained. Gd0.2Ce0.8O2-d nanoparticles
were further processed into inks for inkjet printing. Despite the small
particle size/large surface area, inks with excellent printing behavior were
formulated. For proof-of-concept, thin GDC layers were printed on a) green
NiO-GDC substrates, and on b) presintered NiO-YSZ substrates. While no dense
layers could be obtained on the green NiO-GDC substrates, GDC nanoparticles
printed on NiO-YSZ substrates formed a dense continuous layer after firing.
