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Bonding in Metals02:32

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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Stable contrast mode on TiO2(110) surface with metal-coated tips using AFM.

Yan Jun Li1, Huanfei Wen2, Quanzhen Zhang2

  • 1Department of Applied Physics, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan; National Key Laboratory for Electronic Measurement and Technology, North University of China. No. 3, Xueyuan Road, Taiyuan, Shan Xi 030051, China.

Ultramicroscopy
|May 28, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a stable atomic force microscopy method for TiO2 surfaces using a tungsten-coated silicon cantilever. This technique achieves 95% contrast, enabling detailed surface structure and electronic property analysis.

Keywords:
Atomic force microscopy (AFM)Stable contrast modeTiO(2)(110) surface

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Area of Science:

  • Surface Science
  • Materials Science
  • Nanotechnology

Background:

  • Atomic Force Microscopy (AFM) is crucial for surface analysis.
  • Achieving stable contrast and accurate surface geometry is challenging.
  • Titanium dioxide (TiO2) surfaces are important in catalysis and electronics.

Purpose of the Study:

  • To develop a stable contrast mode for Atomic Force Microscopy (AFM) on TiO2(110) surfaces.
  • To demonstrate the role of a stable tip apex in obtaining accurate surface geometry.
  • To enable atomic-resolution investigation of electronic structure and surface potential.

Main Methods:

  • Utilized a tungsten-coated silicon cantilever for AFM measurements on TiO2(110).
  • Employed a stable contrast mode achieving approximately 95% contrast rate.
  • Correlated tip apex stability with surface geometry accuracy.

Main Results:

  • A stable contrast mode with ~95% rate was achieved on TiO2(110).
  • A stable tip apex is critical for accurate surface geometry during AFM.
  • The W-coated Si cantilever successfully provided information on surface structure and tunneling current.
  • Atomic-resolution investigation of electronic structure and surface potential was demonstrated.

Conclusions:

  • The developed method provides stable contrast for high-resolution AFM on TiO2 surfaces.
  • Stable tip apex is essential for reliable surface geometry determination.
  • This technique facilitates detailed studies of electronic properties and holds potential for catalytic reaction mechanism investigations.