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Diamond surface conductivity under atmospheric conditions: theoretical approach
Karin Larsson1, Juergen Ristein
1Department of Materials Chemistry, Angstrom Laboratory, Box 538, 75121 Uppsala, Sweden. karin.larsson@mkem.uu.se
The Journal of Physical Chemistry. B
|July 21, 2006
Summary
Electron transfer from diamond surfaces to acidic water creates p-type conductivity. This study reveals electron transfer to hydronium ions, inducing holes and weakening bonds in the aqueous adlayer.
Area of Science:
- Surface Science
- Quantum Chemistry
- Materials Science
Background:
- Hydrogen-terminated diamond (100)-2x1 surfaces are crucial in various electronic applications.
- Understanding surface interactions with water is vital for predicting material behavior in humid environments.
Purpose of the Study:
- To theoretically investigate electron transfer from H-terminated diamond to water adlayers.
- To determine the impact of acidic water on diamond surface conductivity.
Main Methods:
- Density Functional Theory (DFT) calculations were employed.
- Periodic boundary conditions were used to model the surface.
- The electronic structure and charge transfer were analyzed.
Main Results:
- An acidic environment induced p-type surface conductivity.
- 1.8 electrons per surface unit cell transferred from the diamond valence band to the aqueous adlayer.
- A delocalized hole was created on the diamond surface, and H(3)O(+) bonds were weakened.
Conclusions:
- Acidic water can induce significant electronic changes on diamond surfaces.
- Electron transfer plays a key role in modifying diamond surface properties.
- The interaction leads to hole formation and altered molecular bonding in the adlayer.
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