TY JOUR TI Synthesis of nanocomposite materials by reduction of Group I metals of the periodic table Au, Ag in the voids of the opal matrix KW nanocomposite materials KW opal matrices KW Ag and Au nanoparticles KW monodisperse spherical silica particles JO Vestnik of geosciences AU Kamashev, D.V. AU Kryazhev, A.A. PY 2022 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"