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Radiation Effects and Defects in Solids 162 (2007) 207-213
Swift heavy ion-induced dissolution of gold nanoparticles in silica matrix
Y.K. Mishra, D. Kabiraj, D.K. Avasthi, J.C. Pivin1

Gold nanoparticles embedded in silica matrix were prepared by co-evaporation. After deposition, the samples were annealed at different temperatures in inert environment for 30 min. No signature of nanoparticle formation was found in case of as-deposited samples, while the annealed samples showed a clear signature of a surface plasmon resonance absorption peak around 520 nm, which indicated the formation of Au nanoparticles. The samples annealed at 900 °C were irradiated with 100 MeV Ag ions at fluences 2.5×1012 and 1×1013 ions/cm2. UV-visible absorption measurements of pristine and irradiated films showed a clear signature of dissolution of Au nanoparticles with ion beam fluence. X-ray diffraction studies of pristine and irradiated samples also supported the dissolution of Au nanoparticles with ion beam fluence. Rutherford backscattering spectrometry was used for quantification of gold.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Matière Condensée/Science des matériaux
Co-evaporation – Surface plasmon resonance – Nucleation and growth – Dissolution of nanoparticles