Ion Synthesis of Colloidal Silver Nanoclusters in the Organic Substrate
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AL.STEPANOV, S.N.ABDULLIN, R.1.KHAIBULLIN, VF.VALEEV, YU.N.OSIN, VVBAZAROV AND I.B.KHAIBULLIN Kazan Physical-Technical Institute, Lab. of Radiation Physics, Sibirsky Trakt 10/7, 420029 Kazan, Russia
ABSTRACT High-dose ion implantation was used to create silver metallic grains in the epoxy resins The structure and optical properties of Ag/organic systems were investigated by transmission electron microscopy and absorption UV-visible spectroscopy, It was established that silver implantation into the organic substrate produced colloidal nanoclusters in the near-surface region, whose average size and size distribution were function of dose value. The silver nanoclusters give rise to optical absorption at the plasmon wavelength. and maximum absorption was shown to be correlated with filling factors. The d.c. resistivities of irradiated samples were measured in temperature range from 5 to 300 K The observed exp(To/T)n behaviour of resistivity indicated that synthesized metal particles are separated
INTRODUCTION Dielectric materials doped with metal particles were extensively studied for their interesting optical and catalytic properties- 2 . During the last years, theoretical studies were demonstrated that metal particle embedded in the dielectric exhibit an enhanced third order non-linear optical susceptibility X(3. (10-9 - 10 8 esu), comparable to that observed for materials containing semiconductor colloids, The high value X,(3) was attributed to contributions from the electron quantum confinement effect and the hot photoexcited electrons and depended critically on the particle size and volume fraction4 . Particle sizes and size distribution can be controlled by different methods For example, metal nanoclusters can also be produced by ion implantation, a technique that permits control of depth, concentration, and to some extent, chemical state of the implanted ions. It was recently demonstrated that Cu and Au nanoclusters composites can be created in silica by ion implantation5. The present paper describes the synthesis of the silver colloids by the ion implantation in the near-surface layer of polymer substrates and our first results of electron microscopic and linear optical investigations of formed materials.
EXPERIMENT Samples were prepared by implanting polymer plates (optical transparent epoxy resin) with singly charged 30 KeV Ag ions at the dose in range from 2.2x10' 6 - 7.5x1016 ion/cm 2 and at current density of 4 ptA!cm 2 . For comparing optical and electrical experiments the Ar ion irradiation of same substrates was made. Implantation was carried out at room temperature in a vacuum of 10-6 Torr, as was done for cobalt 6. 267 Mat. Res. Soc. Symp. Proc. Vol. 392 ©1995 Materials Research Society
For microstructure studies of nanoparticles synthesized in the epoxy the thin surface layers of substrates were placed onto copper grids before being examined on transmission electron microscope TESLA-BS500. The specimens for cross-section TEM were prepared by using microtome LKB. UV-visible absorption spectra wer
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