The main impetus of this work is the fabrication of stable suspensions (in regard to aggregation) suitable for a printing process. Therefore semiconducting nanoparticles were dispersed systematically in organic solvents using a variety of methods (e.g. ultrasound, ultraturrax, and stirred media mill). Via dispersing with a stirred media mill intrinsically stable suspensions of Si nanoparticles were produced after 6 hours of dispersing. The evolution of morphology, particle size and structure was investigated by dynamic light scattering, X-ray diffraction, Raman spectroscopy and high resolution transmission electron microscopy as a function of dispersing time. The microstructural development with varying crystallite size and crystalline volume fraction was analyzed by Raman spectroscopy and directly confirmed by transmission electron microscopy measurements. Careful analysis of the development of particle structure and oxide formation as a function of dispersing time enables the optimization of the fabrication of conductive nanoparticulate inks in regard to the desired properties in printable electronics.
Journal: TechConnect Briefs
Volume: 4, Technical Proceedings of the 2007 NSTI Nanotechnology Conference and Trade Show, Volume 4
Published: May 20, 2007
Pages: 506 - 509
Industry sector: Advanced Materials & Manufacturing
Topicss: Advanced Manufacturing, Nanoelectronics