A School Corporation Kansai University

Nissan Chemical Industries Limited

The School Corporation Kansai University

Hideya Kawasaki

Ryuichi Arakawa

Tomoyuki Ozawa

Yuki Hokita

A copper particle mixture ensures suppression of copper oxidation and high dispersibility, and that can be sintered at a low temperature in a short period of time can suitably be used for a conductive copper ink material. The copper particle mixture contains copper fine particle A and copper nanoparticle B, the copper fine particle A having an average particle diameter of 0.1 &#x3bc;m to 5 &#x3bc;m, and being coated with at least one dicarboxylic acid selected from the group consisting of malonic acid and oxalic acid, the copper nanoparticle B comprising a central portion comprising a copper single crystal, and a protective layer surrounding the central portion, and having an average particle diameter of 1 nm to 100 nm, and the protective layer of the copper nanoparticle B containing at least one member selected from the group consisting of Cprimary alcohols, Csecondary alcohols, and derivatives thereof.

Copper particle mixture and method for manufacturing same, copper particle mixture dispersion, ink containing copper particle mixture, method for storing copper particle mixture, and method for sintering copper particle mixture

An object of the present invention is to provide copper nanoparticles that suppress the oxidation of copper, have an average particle diameter of 10 nm or less and therefore undergo a remarkable reduction in the melting point, are highly dispersible, can be sintered at a low temperature, allow the removal of the protective layer during low-temperature sintering at 150&#xb0; C. or less, and can be suitably used as a conductive copper nanoink material; and to also provide a method for preserving copper nanoparticles, whereby the copper nanoparticles can be stably preserved at room temperature for a long period of time, and can be transported. The present invention provides copper nanoparticles each having a central portion comprising a copper single crystal, and a protective layer surrounding the central portion;

Copper nanoparticles and production method for same, copper nanoparticle fluid dispersion, copper nanoink, copper nanoparticle preservation method, and copper nanoparticle sintering method

The present invention provides an improved method for imaging mass spectrometry using an ionization-assisting matrix of a test sample, wherein the ionization efficiency is high, migration and visual information reduction are inhibited, no interference peaks originating from the matrix occur, and the analysis can be performed at high spatial resolution. Specifically, the present invention provides a method for imaging mass spectrometry using a sample prepared by physical vapor depositing platinum nanoparticles on the surface of a test sample to be subjected to imaging mass spectrometry.

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Suita, Japan

Hideya Kawasaki