Nanoparticle Inks for Directed Assembly of Three-Dimensional Periodic Structures


  • The authors gratefully acknowledge the generous funding for this project provided by the NSF Center for Directed Assembly of Nanostructures (Grant # DMR 01-17792). The robotic deposition apparatus used in this work was designed and built by J. Cesarano and customized software for 3D fabrication was developed by J. E. Smay. J. A. Lewis acknowledges partial support from the U.S. Department of Energy, Division of Materials Sciences through the Frederick Seitz Materials Research Laboratory (Grant # DEFG02-91-ER45439).


Colloidal inks, comprised of concentrated barium titanate nanoparticle gels, were directly assembled via a robotically controlled deposition technique. 3D periodic lattices were created through layer-by-layer patterning of parallel rods, whose periodicity far exceeded the dimension of the nanoparticle building blocks. The Figure shows a scanning electron microscopy image of a 3D periodic lattice (top view).