Modification of an SiO $${}_{2}$$ (Au)/Si Surface by Irradiation with Argon Ions
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OPHYSICS, ELECTRONICS, ACOUSTICS
Modification of an SiO2(Au)/Si Surface by Irradiation with Argon Ions V. D. Bundyukova1, 2* , D. V. Yakimchuk1, E. Yu. Kaniukov3 , D. I. Tishkevich1, 4 , M. D. Kutuzau1 , V. V. Prigodich1 , A. A. Shemukhin1, 5 , Yu. V. Balakshin1, 5 , A. V. Nazarov2 , A. V. Kozhemiako6 , A. P. Evseev2, 6 , and A. E. Ieshkin6 1
Cryogenic Research Division, Scientific-Practical Materials Research Center, National Academy of Sciences of Belarus, Minsk, 220072 Belarus 2 Institute of Nuclear Physics, Moscow State University, Moscow, 119991 Russia 3 National University of Science and Technology MISIS, Moscow, 119049 Russia 4 South Ural State University, Chelyabinsk, 454021 Russia 5 Center for Quantum Technologies, Moscow State University, Moscow, 119991 Russia 6 Department of Physics, Moscow State University, Moscow, 119991 Russia Received January 20, 2020; revised February 7, 2020; accepted February 11, 2020
Abstract—This article presents the results of gold deposition into pores of SiO2 /Si matrices and the modifications of the obtained SiO2 (Au)/Si systems by irradiation with argon Ar+ ions with an energy of 100 keV with a fluence of 5 × 1014 ion/cm2 . The effect of irradiation on changes in the surface topography of SiO2 (Au)/Si systems and the signal intensity of surface-enhanced Raman scattering during the detection of the model analyte (methylene blue) have been shown. Keywords: porous matrices, template synthesis, gold nanostructures, surface modification, ion irradiation, defect formation, surface-enhanced Raman scattering. DOI: 10.3103/S0027134920030078
INTRODUCTION Localized surface plasmons are formed as a result of exposure of metallic nanostructures of copper, silver, and gold to visible electromagnetic radiation [1, 2]. This increases the strength of the electrical field at the surface of metallic nanostructures [3]. The increase in surface roughness on a nanometer scale leads to the increased strength of the resulting field. This effect is used to improve the sensitivity of such spectrometric methods as fluorescence spectroscopy and Raman scattering. The increase in the Raman scattering cross-section of the investigated substances is so significant that this technique is called surface-enhanced Raman scattering (SERS). In some cases, the SERS method can reach the sensitivity required to detect analytes with monomolecular concentrations [4]. Taking the results achieved in the production of SERS active substrates and a wide range of applications in biology, medicine, and *
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sensorics [5–7] into account, the search for effective and inexpensive SERS active substrates is still in progress. Previously, a method was proposed to create nanostructured plasmon-active surfaces from copper and silver by template synthesis in SiO2 /Si ion-track matrices using chemical deposition of metal into matrix pores [8, 9]. It was shown that it is possible to control the morphology of structures in order to create the highest roughness of structures at the nano level by changing the
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