Formation effects and optical absorption of Ag nanocrystals embedded in single crystal SiO2 by implantation

Abstract

Ag + ions of 200 keV were implanted into single crystal SiO2 at room temperature to five different doses: 5×1015, 2.3×1016, 4.5×1016, 5.6×1016, and 6.7×1016/cm2. With increasing dose, the implanted Ag distributions change from usual Gaussian-type profiles to abnormal bimodal profiles with narrow full width at half maximum, which are associated with Ag nanoparticles forming during high dose implantation. The implanted Ag depth profile evolution with dose can be clearly observed during Rutherford backscattering spectroscopy analysis. The nanoparticles form dual-layer structures at high doses: as far as the dose of 6.7×1016/cm2 is concerned, transmission electron microscopy proves that the shallower implanted layer contains noninteracting small Ag nanoparticles with the diameters of about 7 nm; the deeper layer contains a high density of interacting large nanoparticles with the diameters of about 25 nm. High resolution electron microscopy identifies that the nanoparticles are perfect single crystals. Although plasmon resonance frequency of the Ag nanoparticles formed at relatively low dose agrees well with the Mie’s theoretical prediction, great redshift due to multipole interactions between high density nanoparticles occurs for high doses, moreover, the magnitude of redshift increases with implanted dose.

Effects of ion beam irradiation on self-trapped defects in single-crystal Lu2SiO5

“…As an example, implantation of metals into glasses leads to precipitation of the implanted species into nanoparticles that alter the optical response of the material due to Mie scattering [2][3][4]. The optical response is a function of the implanted species and average particle size, which, in turn, is determined by the peak concentration of the implanted profile [5].…”

Optical and AFM study of ion-synthesised silver nanoparticles in thin surface layers of SiO2 glass

“…The further increase of ion fluence above 1.0×10 16 cm − 2 causes considerable sputtering of the surface that in turn originates shift of the final impurity depth profile towards surface [28,29]. Thus, maximum of the silver distribution can be located just about 10 nm below the surface level and the concentration monotonically decreases towards bulk.…”

Spectrally-selective gold nanorod coatings for window glass

“…This effect is proportional to (R/d ) 2L+1 , where R is particle radius, d is the interparticle distance, and L is the multipole order (L=1 for dipole, L=2 for quadrupole, etc.) in the case of gold nanospheres [42]. Both increasing size and reducing spacing of particles will reinforce the effect.…”