Synthesis of Manganese-Based Precursors and Nanoparticles for Electronic Printing Applications

Thao Nguyen, Timothy J. Boyle, LaRico J. Treadwell

Sandia National Laboratories

Manganese makes up 0.11% of the earth’s crust and is an important element in stainless steel manufacturing due to its low cost, malleability, ease of alloying, and ability to remove impurities. Manganese oxide is also desirable due to its magnetic properties, catalytic activity and high energy density. As instrumentation get smaller and smaller, the electronics that control them will also have to be reduced in size. Direct write manufacturing is a method that provides precision when printing for products in computer electronics. These technologies require high quality nanoinks composed of nanoparticles suspended in organic solvents. Manganese-based inks are of interest due to their potential applications noted above but little work has been proffered concerning their development. This fundamental study focuses on the impact the ligand has on the properties (size, morphology, phase, etc.) of the final nanoparticles generated and was investigated using commercial (Mn-nitrates, chlorides, and acetates) and tailor-made precursors. In particular, the various Mn-L bonds (i.e., Mn-O, Mn-C, Mn-N) were investigated using alkoxides, mesityl, and amide derivatives synthesized in-house. Additionally, the commercially available were evaluated.
Manganese mesityl was synthesized from the metathesis reaction of manganese bromide and mesityl magnesium bromide. Manganese alkoxide precursors were synthesized from manganese mesityl and various aryl alcohols in coordinating solvents. Inorganic crystals were characterized with single crystal X-ray diffraction (SCXRD) and Fourier Transform Infrared Spectroscopy (FTIR). Nanoparticles were synthesized from this family of precursors using solution precipitation and solvothermal syntheses techniques. To examine the influence of various precursor choice on morphology of nanoparticles, Transmission Electron Microscopy (TEM) and Powder X-ray Diffraction (PXRD) were conducted. This presentation will report on the synthesis of the compounds, the nanomaterials generated, and try to restablish how the variables of synthesis (e.g., precursors, coordinating solvents, time and temperature) affected the final size, shape and phase of the final nanomaterials product.

Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.