A School Corporation Kansai University

Nissan Chemical Industries Limited

Ryuichi Arakawa

Hideya Kawasaki

Tomoyuki Ozawa

Yuki Hokita

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

Ryuichi Arakawa