Metal fine particles and manufacturing method therefor
First Claim
1. A manufacturing method for metal fine particles each having a particle diameter of several tens nanometers, characterized in that laser beams having at least an energy density not lower than an energy density Eth2[J/cm2] necessary for allowing metallic particles to reach the vicinity of the boiling point are irradiated to the metallic particles, each having a particle diameter of several hundred nanometers, the metallic particles being dispersed in a dispersion liquid during the irradiating with the laser beams, wherein the dispersion liquid does not additionally contain a surface active agent or other protecting agent that restrains aggregation of the metal fine particles.
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Accused Products
Abstract
There is provided a method for efficiently manufacturing metal nano particles without condensing laser beams by using a lens etc. In this method, first, metallic foil pieces, which are a starting material, are dispersed in a dispersion liquid. Next, laser beams are irradiated directly to the metallic foil pieces without providing a condensing means, by which many metal fine particles are yielded. The particle diameters of the metal fine particles obtained can be controlled to sizes from nano particles to submicron particles by utilizing the relationship between the shape (especially thickness) of the metallic foil piece which is a starting material and the absorbed energy of the laser beam.
9 Citations
11 Claims
- 1. A manufacturing method for metal fine particles each having a particle diameter of several tens nanometers, characterized in that laser beams having at least an energy density not lower than an energy density Eth2[J/cm2] necessary for allowing metallic particles to reach the vicinity of the boiling point are irradiated to the metallic particles, each having a particle diameter of several hundred nanometers, the metallic particles being dispersed in a dispersion liquid during the irradiating with the laser beams, wherein the dispersion liquid does not additionally contain a surface active agent or other protecting agent that restrains aggregation of the metal fine particles.
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6. A manufacturing method for metal fine particles by using metallic foil pieces as a starting material, comprising a step of dispersing the metallic foil pieces in a dispersion liquid;
- and a step of subsequently irradiating laser beams directly to the metallic foil pieces, characterized in that the dispersion liquid is a solvent consisting of chain or cyclic ketone.
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7. A manufacturing method for metal fine particles by using metallic thin films as a starting material, comprising a step of immersing a substrate the top surface of which is formed with a metallic thin film in a solvent, wherein the metallic thin film has a thickness not larger than 1 μ
- m, and wherein the solvent is a dispersion liquid that does not additionally contain a surface active agent or other protecting agent that restrains aggregation of the metal fine particles; and
a step of subsequently irradiating laser beams directly to the metallic thin film from the top surface or the back surface of the substrate. - View Dependent Claims (8)
- m, and wherein the solvent is a dispersion liquid that does not additionally contain a surface active agent or other protecting agent that restrains aggregation of the metal fine particles; and
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9. A manufacturing method for metal fine particles each having a particle diameter of several tens nanometers, characterized in that laser beams, having at least an energy density not lower than an energy density Eth2[J/cm2] necessary for allowing metallic foil pieces, having a thickness not larger than 1 μ
- m, to reach the vicinity of the boiling point, are irradiated to the metallic foil pieces, the metallic foil pieces being dispersed in a dispersion liquid during the irradiating, wherein the dispersing liquid does not additionally contain a surface active agent or other protecting agent that restrains aggregation of the metal fine particles.
- View Dependent Claims (10)
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11. A manufacturing method for metal fine particles by using metallic thin films as a starting material, comprising a step of immersing a substrate, the top surface of which is formed with a metallic thin film, in a solvent, wherein the metallic thin film has a thickness not larger than 1 μ
- m, and wherein the solvent is a dispersion liquid that does not contain sodium dodecyl sulfate; and
a step of subsequently irradiating laser beams directly to the metallic thin film from the top surface or the back surface of the substrate.
- m, and wherein the solvent is a dispersion liquid that does not contain sodium dodecyl sulfate; and
Specification