Metal fine particles, composition containing the same, and production method for producing metal fine particles
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United States of America Patent
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Issued Date -
Nov 30, 2006
app pub date -
Sep 2, 2004
filing date -
Sep 5, 2003
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Abandoned
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Abstract
The present invention provides metal fine particles which have selective wavelength absorption characteristics in a wavelength region from visible light to near infrared light, and have sharp absorption characteristics, and influences little the surrounding wavelength, and therefore, they yield tones having high chroma. The present invention provides metal fine particles wherein an aspect ratio is in a range from 1.1 to 8.0, a maximum absorption wavelength in plasmon absorption is in a range from 400 nm to 1,200 nm, and an absorption coefficient at a peak position of the maximum absorption wavelength is in a range from 6,000 to 20,000 L/molcm (measurement concentration: 1.6.times.10.sup.-4 mol/L, and solvent:water).
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