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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.Hydrogen Bonds Control the World!Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are...
Atomic Fluorescence Spectroscopy01:29

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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...

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Related Experiment Video

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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
10:25

Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid

Published on: December 20, 2016

Hydrogen-related contrast in atomic force microscopy.

René Schmidt1, Alexander Schwarz, Roland Wiesendanger

  • 1Institute of Applied Physics and Microstructure Advanced Research Center, University of Hamburg, Jungiusstrasse 11, Hamburg D-20355, Germany.

Nanotechnology
|June 11, 2009
PubMed
Summary

Hydrogen adsorption on gadolinium islands on W(110) creates distinct height levels. This study clarifies electrostatic forces, enabling identification of clean gadolinium regions for magnetic studies.

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Area of Science:

  • Surface Science
  • Materials Science
  • Nanotechnology

Background:

  • Gadolinium (Gd) islands epitaxially grown on Tungsten (W(110)) are model systems for studying surface phenomena.
  • Understanding hydrogen adsorption on metal surfaces is crucial for catalysis and materials science.
  • Atomic Force Microscopy (AFM) is a powerful tool for nanoscale surface characterization.

Purpose of the Study:

  • To investigate the impact of hydrogen adsorption on the surface topography and electronic properties of gadolinium islands on W(110).
  • To elucidate the role of electrostatic forces in contrast formation during non-contact AFM imaging of hydrogen-covered gadolinium.
  • To establish a method for unambiguously identifying clean and hydrogen-covered gadolinium regions.

Main Methods:

  • Utilizing non-contact Atomic Force Microscopy (AFM) in constant force mode.
  • Analyzing bias-dependent height differences in AFM images to understand electrostatic interactions.
  • Correlating AFM observations with changes in local work function and charge distribution.

Main Results:

  • Gadolinium islands displayed two distinct height levels attributed to hydrogen-covered and clean areas.
  • AFM contrast was found to be strongly dependent on tip-sample bias, indicating electrostatic forces dominate.
  • Experimental data supports a model involving local work function reduction and localized charges on hydrogen-covered gadolinium.
  • The study successfully identified clean gadolinium regions by clarifying electrostatic contrast mechanisms.

Conclusions:

  • Hydrogen adsorption significantly alters the surface electronic properties of gadolinium islands, affecting AFM contrast.
  • Electrostatic tip-sample forces, specifically variations in contact potential difference, are key to interpreting AFM images.
  • The findings provide a foundation for advanced magnetic studies by enabling precise identification of surface regions with altered magnetic properties due to hydrogen.