| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive, highly pure and highly concentrated colloid of composite metal nanoparticles by a physical producing method.SOLUTION: First metal nanoparticles constituting composite metal nanoparticles have an average particle diameter of 10 nm to 100 nm, At least one metal nanoparticle of each metal nanoparticle composing the encircling nanoparticle arranged around the first metal nanoparticles has an average particle diameter of less than 10 nm. A colloid of composite metal nanoparticle 27 comprises a composite metal nanoparticle and a surfactant without solvents. A metal evaporated in a vacuum is obtained by capturing with a membranous surfactant layer 26 formed on the surface of an inner wall 21a of a vacuum evaporator. |
