CPC G01N 33/558 (2013.01) [G01N 33/54346 (2013.01); G01N 33/553 (2013.01)] | 10 Claims |
1. A marker, comprising a resin-metal composite with a structure formed by immobilizing metal particles on a resin particle, characterized by
having constitution (A):
(A) the average particle size of the resin-metal composite being in a range of 300 nm to 1000 nm, and the average particle size of the metal particles being in a range of 1 nm to 80 nm,
wherein the metal particles comprise: metal particles having a portion embedded in the resin particle and a portion exposed from the resin particle, and metal particles adsorbed on a surface of the resin particle, wherein an amount of the metal particles adsorbed on the surface of the resin particle is 20 wt % or less relative to the total metal particles,
the metal particles are gold particles, and
the resin particle is a particle comprising a nitrogenous polymer, the nitrogenous polymer being selected from the group consisting of poly-2-vinylpyridine, poly-3-vinylpyridine, poly-4-vinylpyridine, poly-2-(diisopropylamino)ethyl methacrylate, polypyrrole, polyamide, polyamic acid, and polyimide.
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