Particle Assembly of Micron and Nano Scale Materials with Particle-to-Particle Precision

T.Y. Olson and T.Y. Han
LLNL, US

Keywords: assemblies, electrophoretic deposition, programmable, on-demand

Summary:

Precise positioning of particles has wide implications for a variety of applications such as in device fabrication, controlled crystallization, and tuning of materials properties. We have developed a versatile particle assembly technique with precision down to the single particle level, allowing fabrication of limitless particle configurations. Micron sized polystyrene beads were assembled by electrophoretic deposition (EPD) with high reproducibility onto pre-designed, hole-patterns where single, dimers, and higher ordered particle array assemblies were fabricated. Other types of particles can be assembled, facilitating enormous potential for creating a wide range of interesting materials such as negative-index optical metamaterials, plasmonic waveguides, antennas, superlens, and data storage devices. Furthermore, voltage and pattern effects on the electric field during EPD allows for multi-material deposition, enabling this technique to produce mesoscale materials of compositions that are normally not possible by conventional methods. Numerical simulations of a particle during deposition onto a patterned electrode will also be discussed. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.