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We analyze the results of scanning near-field infrared spectroscopy performed on thin films of a-SiO2(silicon dioxide) on Si substrate. The measured near-field signal exhibits surface-phonon resonances whose strength has a prominent thickness dependence in the range from 2 to 300nm. These observations are compared with calculations in which the tip of the near-field infrared spectrometer is modeled either as a point dipole or an elongated spheroid. The latter model accounts for the antenna effect of the tip and gives a better agreement with the experiment. Possible applications of the near-field technique for depth profiling of layered nanostructures are discussed.

The mobility of copper ions and redox reactions of Cu at the interface with silicon dioxide being directly attributed to the resistive switching effect have been studied by cyclic voltammetry (CV). The electrode kinetics of the Cuz+/Cu redox reactions were analyzed suggesting the formation of both Cu+ and Cu2+ species. The ion mobility shows an unexpected strong dependence on the ion concentration indicating ion–ion interactions typical for concentrated solution conditions. Based on the standard reduction potentials for Cuz+/Cu we identified partial electrochemical redox reactions during oxidation and reduction. The results contribute to a detailed understanding of the resistive switching effect in Cu/SiO2/Pt cells and provide insight into electrochemically assisted diffusion of metal cations in oxides in general.

In the alcohol-water mixed solvent containing ammonia as a catalyst, TEOS as silicon source, by a sol - spherical particles dispersed silicon dioxide gel process orders, carry out research through the perspective of various reaction conditions such as solvent type electron microscope, and ammonia the effect of water concentration and temperature on the hydrolysis of the silica particle size and morphology showed: methanol and ethanol as a solvent and form monodisperse silica spherical particles to propanol and butanol as a solvent dioxide spherical silicon particles are easily aggregated; in other conditions remain unchanged, the diameter of spherical particles with water and a silicon source concentration increased with the increase; and elevated temperature hydrolysis, the resulting particle size increases gradually, We studied and discussed the formation mechanism of the silica particles under different reaction conditions.



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