K-H Ernst et al 1999 Nanotechnology 10 355 doi:10.1088/0957-4484/10/3/320
Nanostructured chiral surfaces
K-H Ernst
, M Böhringer, C F McFadden, P Hug, U Müller and U Ellerbeck
Chiral organic surfaces were generated via adsorption of the pure enantiomers of heptahelicene, a helically shaped aromatic hydrocarbon, on a Ni(111) surface in ultra high vacuum. Time-of-flight secondary mass spectrometry (ToF-SIMS) revealed that the molecule stays intact at room temperature. The formation of a two-dimensionally ordered structure at monolayer coverage is observed via low-energy electron diffraction (LEED) and scanning tunnelling spectroscopy (STM). For creation of a chiral metal film, the chiral organic monolayer was subjected to subsequent metal physical vapour deposition. Differences in morphology of grown copper and palladium films were only observed when heptahelicene was adsorbed prior to deposition. No screw dislocations with preferred handedness were observed when the pure enantiomers were used.
- PACS
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68.43.Fg Adsorbate structure (binding sites, geometry)
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
- Subjects
- Dates
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Issue 3 (September 1999)
Received 14 January 1999, in final form 26 May 1999
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Nanostructured chiral surfaces
K-H Ernst et al 1999 Nanotechnology 10 355
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