Laser-based method for fabricating monodisperse metallic nanoparticles

Abstract

An experimental method is presented for fabrication of almost monodisperse metal nanoparticles on substrate surfaces. It relies on substantial narrowing of broad size distributions through irradiation with short laser pulses by exploiting the size dependent optical absorption coefficient of the metal particles. Successive irradiation by applying two laser wavelengths completely removes the smallest clusters of the distribution and causes a size reduction of the largest particles. Finally, only clusters with diameters in a very narrow size interval remain on the surface. By using this method, Ag clusters with mean diameters of 〈d〉=10 nm and size distributions with standard deviations of Δd/〈d〉=0.13 have been prepared.

Plasmon resonances of silver nanowires with a nonregular cross section

“…16 In recent years, considerable progress has been made in the fabrication of metallic nanostructures in a controlled manner, including features in the 10-50 nm range. [17][18][19][20][21][22][23][24][25][26] Metallic particles with a variety of shapes and dimensions are now readily available for experiments. A thorough understanding of the detailed local fields associated with plasmon resonant particles is therefore warranted, to enhance the design and optimization of applications based on these particles.…”

Structure and Properties of Nanoparticles Formed by Ion Implantation

“…The application of lasers for nucleating metal nanoclusters using frequencies on either side of the surface plasmon resonance (SPR) represents a powerful new tool for controlling the size and size distribution of the nanocrystals [4]. Various groups began investigating the use of laser annealing for creating metal nanocrystals with and without additional thermal treatments in attempts to narrow the size distribution of the metal nanocrystals.…”

Stochastic processes in light-assisted nanoparticle formation

“…This can induce desorption of a deposited metallic material when it reaches the resonant diameter. 21,22 It turns out that as the deposition of the metallic material proceeds, the growth is governed by a tradeoff between deposition and desorption, which determines the particle diameter, depending on the photon energy of the incident light. Consequently, an array of metallic nanoparticles is aligned along the groove, as shown in Fig.…”