Scholarlink

Abstract <p>Adsorption of molecular oxygen on the Ag(111) surface at room temperature has been studied using scanning tunneling microscopy (STM), Auger-electron spectroscopy (AES), temperature programmed desorption (TPD), and density functional theory (DFT). In the early stage of adsorption, the STM images show formation of a disordered phase in the form of dark spots (local oxide (Ag<sub>6</sub>O<sub>6</sub>) rings. Further O<sub>2</sub> dosing leads to the formation of a set of bright objects 5–8 Å in size, which were associated with CO<sub>2</sub> molecules stabilized on the surface due to the presence of H<sub>2</sub>O molecules. Heating of the system to temperatures above 423&#xa0;K led to partial desorption of silver dioxide molecules and formation of ordered striped (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(8 \times 2\sqrt 3 \)</EquationSource> <!--PhysWave2570033Andryushechkin-m1--> </InlineEquation>) and hexagonal (3 × 3) phases. According to the DFT calculations, the (3 × 3) phase can be interpreted as surface high-temperature silver carbonate (Ag<sub>2</sub>CO<sub>3</sub>), adsorbed on Ag(111). Small areas with the (3 × 3) phase can be seen in STM images even after heating to 540 K, which indicates higher temperature stability of surface carbonates on Ag(111) than it was believed previously.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Identification of the Surface Phases Formed on the Ag(111) Face during Molecular Oxygen Adsorption at Room Temperature

  • 期刊论文

  • 发表日期：

    2025年12月29日

查看全文
  • B. V. Andryushechkin,
  • T. V. Pavlova,
  • V. M. Shevlyuga,
  • A. V. Nartova,
  • V. I. Bukhtiyarov

摘要

Abstract

Adsorption of molecular oxygen on the Ag(111) surface at room temperature has been studied using scanning tunneling microscopy (STM), Auger-electron spectroscopy (AES), temperature programmed desorption (TPD), and density functional theory (DFT). In the early stage of adsorption, the STM images show formation of a disordered phase in the form of dark spots (local oxide (Ag6O6) rings. Further O2 dosing leads to the formation of a set of bright objects 5–8 Å in size, which were associated with CO2 molecules stabilized on the surface due to the presence of H2O molecules. Heating of the system to temperatures above 423 K led to partial desorption of silver dioxide molecules and formation of ordered striped ( \(8 \times 2\sqrt 3 \) ) and hexagonal (3 × 3) phases. According to the DFT calculations, the (3 × 3) phase can be interpreted as surface high-temperature silver carbonate (Ag2CO3), adsorbed on Ag(111). Small areas with the (3 × 3) phase can be seen in STM images even after heating to 540 K, which indicates higher temperature stability of surface carbonates on Ag(111) than it was believed previously.