Fabrication of Nanoscale Gold Clusters by Low Energy Ion Irradiation
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1020-GG07-17
Fabrication of Nanoscale Gold Clusters by Low Energy Ion Irradiation Volha Abidzina1, I. Tereshko1, I. Elkin2,3, V. Red'ko1, S. Budak4, C. Muntele4, D. Walker5, and D. Ila4 1 Belarusian-Russian University, Prospect Mira 43, Mogilev, 212005, Belarus 2 Research and Production Enterprise "KAMA VT" Plc., Karl Liebknecht Str. 3a, Mogilev, 212000, Belarus 3 "NANTES - Systemy Nanotechnologii" Plc., Dolne Mlyny Str., 21, Boleslawiec, 59-700, Poland 4 Center for Irradiation of Materials, Alabama A&M University, Normal, AL, 35762-1447 5 Physics Dept., University of Alabama in Huntsville, Huntsville, AL, 35899 ABSTRACT This work is focused on nanoscale gold particle formation by low-energy ion irradiation in glow-discharge plasma and research into particle growth by increasing the time of exposure. SiO2+Au films on SiO2 substrates produced by ion beam assisted deposition (IBAD) were exposed to ion irradiation at 1.2 keV energy for 1-2 hours. Plasmon resonance emergence caused by nanoparticle formation was observed by optical absorption apectrometry (OAS).
INTRODUCTION Inclusion of materials in glass has been used for hundreds of years to color glasses. Metallic colloids embedded in dielectrics produce colors associated with optical absorption at the surface plasmon resonance frequency [1-3]. Metallic ion implantation, thermal or laser annealing have been used to change linear and non-linear optical properties near the surface of silica glass [410]. Metal nanoparticles have mainly been studied because their unique optical properties cause a broad absorption band in the visible region of the electromagnetic spectrum [11]. Optical properties of glass with metallic particles, as a rule, are characterized by optical absorption or reflection [12, 13]. Intensity and position of a selective region maximum of metallic nanoparicles are defined by effects of plasmon resonance and depend on concentration and particles size. In case of spherical shaped particles and their low concentration, spectral position of ranges is successfully predicted by Mie theory [14]. In particular, the theory allows to define quantitatively an average size of particles in case of their uniform volume distribution and narrow function of particles size distribution. Spectra of metallic nanoparticles can also be analyzed using effective media theory [14], i.e. increase in metallic fraction in the sample leads to red shift of plasmon resonance spectrum.
EXPERIMENTAL METHODS SiO2+Au films on SiO2 substrates were produced by IBAD. The Amersil silica rod and gold (from Scientific Instrument Services) were placed in the crucible of the deposition system. The
SiO2 substrates (suprasil) were placed on the substrate holder, ten inches above the silica rod. The co-deposition of gold and silica was conducted at 6∑10-6 Torr. The evaporation rate of gold and silica was calibrated in advance and subsequently checked by RBS. The thicknesses of the films and Au concentration were measured by RBS. The RBS analysis of a typical sample is shown in Figure 1. Sampl
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