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<p>In this work, two different methods, thermal decomposition and chemical reduction with hydrogen peroxide, were used to prepare metallic Ag and hybrid Ag<sub>2</sub>O/Ag particles via pseudomorphic transformation of the Ag<sub>2</sub>O microcubes. The as-prepared particles were characterized by X-ray diffraction (XRD), scanning electronics microscopy (SEM), energy-dispersive spectroscopy (EDS), and thermogravimetry (TG). Experimental results showed that, in both cases, the resulting Ag particles retained the shape and size of the Ag<sub>2</sub>O ones, although their microstructure differed significantly. Thus, the silver particles that composed the cubic aggregates prepared via chemical reduction of Ag<sub>2</sub>O with hydrogen peroxide were significantly smaller than those produced via thermal treatment of Ag<sub>2</sub>O. Thermogravimetric analysis showed single-step decomposition with a total mass loss of 67%, corresponding to complete transformation of Ag<sub>2</sub>O to Ag. Silver particles of about 10–50&#xa0;nm in size were formed on the surface of the Ag<sub>2</sub>O microcrystals at the initial stages of the thermal decomposition. The complete transformation of Ag<sub>2</sub>O into Ag occurred at a temperature of 370&#xa0;°C with the formation of cubic aggregates consisting of silver particles of 100–150&#xa0;nm in size, the average edge length of which was ~ 1.2&#xa0;μm.</p><p>.</p>

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Comparison of the morphology of silver particles prepared by chemical reduction of silver oxide with hydrogen peroxide and its thermal decomposition

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Boris B. Bokhonov,
  • Tatyana A. Borisenko,
  • Olga A. Logutenko,
  • Alexander I. Titkov

摘要

In this work, two different methods, thermal decomposition and chemical reduction with hydrogen peroxide, were used to prepare metallic Ag and hybrid Ag2O/Ag particles via pseudomorphic transformation of the Ag2O microcubes. The as-prepared particles were characterized by X-ray diffraction (XRD), scanning electronics microscopy (SEM), energy-dispersive spectroscopy (EDS), and thermogravimetry (TG). Experimental results showed that, in both cases, the resulting Ag particles retained the shape and size of the Ag2O ones, although their microstructure differed significantly. Thus, the silver particles that composed the cubic aggregates prepared via chemical reduction of Ag2O with hydrogen peroxide were significantly smaller than those produced via thermal treatment of Ag2O. Thermogravimetric analysis showed single-step decomposition with a total mass loss of 67%, corresponding to complete transformation of Ag2O to Ag. Silver particles of about 10–50 nm in size were formed on the surface of the Ag2O microcrystals at the initial stages of the thermal decomposition. The complete transformation of Ag2O into Ag occurred at a temperature of 370 °C with the formation of cubic aggregates consisting of silver particles of 100–150 nm in size, the average edge length of which was ~ 1.2 μm.

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