Methods of controlling nanoparticle growth
First Claim
1. A method of forming nanoprisms comprising exposing silver particles to light having a narrow band of wavelengths in the range of between about 400 nm and about 700 nm, said wavelengths capable of exciting a dipole plasmon mode of the silver particles to form silver nanoprisms having a bimodal size distribution.
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Abstract
The invention provides new types of plasmon-driven growth mechanism for silver nanostructures involving the fusion of triangular nanoprisms. This mechanism, which is plasmon excitation-driven and highly cooperative, produces bimodal particle size distributions. In these methods, the growth process can be selectively switched between bimodal and unimodal distributions using dual beam illumination of the nanoparticles. This type of cooperative photo-control over nanostructure growth enables synthesis of monodisperse nanoprisms with a preselected edge length in the 30–120 nm range simply by using one beam to turn off bimodal growth and the other (varied over the 450–700 nm range) for controlling particle size.
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Citations
31 Claims
- 1. A method of forming nanoprisms comprising exposing silver particles to light having a narrow band of wavelengths in the range of between about 400 nm and about 700 nm, said wavelengths capable of exciting a dipole plasmon mode of the silver particles to form silver nanoprisms having a bimodal size distribution.
- 23. A method of forming a nanoprism comprising exposing silver particles to a primary and a secondary wavelength of light and exciting a dipole plasmon mode in the silver particles with the primary wavelength of light and a quadrupole resonance mode of the nanoprism with the secondary wavelength of light to form silver nanoprisms having a unimodal size distribution, wherein the primary and secondary wavelengths of light comprise narrow bands of wavelengths of light.
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