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Modifying the STM tip for the ' ultimate ' imaging of the Si(111)-7×7 surface and metal-supported molecules.
- Source :
-
Chimia [Chimia (Aarau)] 2012; Vol. 66 (1-2), pp. 31-7. - Publication Year :
- 2012
-
Abstract
- We report on high-resolution STM measurements with modified probe tips. First, both the rest atoms and adatoms of a Si(111)-7×7 surface are observed simultaneously. The visibility of rest atoms is dependent upon the sample bias voltage (less than -0.7 V) and is enhanced by sharpening the tip, which is rationalized by first-principles calculations. Second, a tip with a perylene molecule adsorbed at its apex is used to discriminate the molecular states and the metal states of the underlying Ag(110) surface, which is attributable to a mismatch between the energy levels of the functionalized tip and the adsorbates on silver. Lastly, high-resolution images of iron phthalocyanine (FePc) and zinc phthalocyanine (ZnPc) molecules on Au(111) are obtained by using an O(2)-terminated tip, and the images reveal rich intramolecular features arising from molecular orbitals that are not observed when using clean metallic tips.
Details
- Language :
- English
- ISSN :
- 0009-4293
- Volume :
- 66
- Issue :
- 1-2
- Database :
- MEDLINE
- Journal :
- Chimia
- Publication Type :
- Academic Journal
- Accession number :
- 22546188
- Full Text :
- https://doi.org/10.2533/chimia.2012.31