@misc{oai:repo.qst.go.jp:00078770,
 author = {Yamada, T. and Maekawa, Masaki and Kawasuso, Atsuo and Maekawa, Masaki and Kawasuso, Atsuo},
 month = {Oct},
 note = {The metal nanoparticles may show a specific property in electric state such as the quantum effect from the lower periodicity of crystal unlike bulk metal. They are expected as a new functional  material  by  their  properties,  such  as  catalyst  or  surface  plasmon  resonance. However, the powdery nanoparticles have limits to apply for industry use, so the synthesis of them in and on bulky materials is useful way. It may develop a specific property like a simple substance particle even if I produce nanoparticles in an inorganic material in that. In general, it is well known that colloidal nanoparticles in liquids sometime show characteristic optical property called surface plasmon absorption (SPA) [1]. It is very difficult to control the shape and size of nanoparticles during synthesis. Ion implantation is candidate as one of the methods to synthesis the nanoparticles in glassy solids [2]. Furthermore, we found that it is possible to control the shape of nanoparticles synthesized in an amorphous SiO2 by heavy ion irradiation. In this study, we have tried to synthesize Ni nanoparticles by the implantation of Ni ions with energy of 30 – 300keV into SiO2 amorphous glass. Also we have investigated them by UV-vis absorption spectroscopy, X-ray diffraction and positron annihilation spectroscopy in order to estimate the character and structure of nanoparticles. In cases of Ni ion implantation with the energy more than 100 keV, the SPAs of Ni in ultraviolet and visible band appears with low irradiation  fluence. This  result  shows  the  formation  of  Ni  nanoparticles  in  SiO2  without annealing process. In these samples, decreasing trend of  positron annihilation Doppler S parameter by the irradiation showing the shrinkage of free volume in SiO2 matrix., 2019 4th Japan-China Joint Workshop on Positron Science},
 title = {Synthesis and characterization of metal nanoparticles in SiO2 amorphous glass by ion irradiation method},
 year = {2019}
}