Nanogram Corporation

Weidong Li

Shivkumar Chiruvolu

Igor Altman

Gina Elizabeth Pengra-Leung

Bernard Frey

Uma Srinivasan

Guojun Liu

Robert B Lynch

Hui Du

Nobuyuki Kambe

Ronald James Mosso

Masaya Soeda

Silicon based nanoparticle inks are formulated with viscous polycyclic alcohols to control the rheology of the inks. The inks can be formulated into pastes with non-Newtonian rheology and good screen printing properties. The inks can have low metal contamination such that they are suitable for forming semiconductor structures. The silicon based nanoparticles can be elemental silicon particles with or without dopant.

Printable inks with silicon/germanium based nanoparticles with high viscosity alcohol solvents

Laser pyrolysis reactor designs and corresponding reactant inlet nozzles are described to provide desirable particle quenching that is particularly suitable for the synthesis of elemental silicon particles. In particular, the nozzles can have a design to encourage nucleation and quenching with inert gas based on a significant flow of inert gas surrounding the reactant precursor flow and with a large inert entrainment flow effectively surrounding the reactant precursor and quench gas flows. Improved silicon nanoparticle inks are described that has silicon nanoparticles without any surface modification with organic compounds. The silicon ink properties can be engineered for particular printing applications, such as inkjet printing, gravure printing or screen printing. Appropriate processing methods are described to provide flexibility for ink designs without surface modifying the silicon nanoparticles.

Silicon/germanium nanoparticles and inks having low metal contamination

Silicon/germanium nanoparticle inks, laser pyrolysis reactors for the synthesis of nanoparticles and associated methods

Hollow silica nanoparticles can have well defined non-porous shells with low shell fragmentation and good dispersability. These well defined hollow particles can be formed through the controlled oxidation of silicon nanoparticles in an organic solvent. The hollow nanoparticles can have a submicron secondary particle sizes. The hollow silica nanoparticles can be incorporated into polymer composites, such as low index-of-refraction composites, for appropriate applications.

Hollow silica nanoparticles as well as synthesis processes and applications thereof

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San Jose, CA, United States of America

Weidong Li