Electric Field and Contact Interactions of Tip with Adenine Molecules on SrTiO3(100)-√ 5×√ 5 Surfaces
- 1 June 1997
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 36 (6S)
- https://doi.org/10.1143/jjap.36.3881
Abstract
We have performed tip-assisted migration of adenine molecules adsorbed on SrTiO3(100)-√ 5×√ 5 surfaces with scanning tunneling microscopy (STM) under ultrahigh vacuum (UHV) conditions at room temperature. The migration with stepwise current control reveals the difference in binding energy of adenine molecules adsorbed on various sites on √ 5×√ 5 surfaces. The adenine molecules easily migrate on the √ 5×√ 5 surface at room temperature and settle down at the trap sites of Sr atoms remaining on the surface. Quantitative analysis of migration probability as a function of tunneling current (I) and tip bias voltage (V t) shows that the electric field effect is dominant at V t≧4 V or I≧70 pA, while contact interaction is dominant at 0 V<V t≦0.1 V for the tip-assisted migration in this system.Keywords
This publication has 8 references indexed in Scilit:
- Two-dimensional self-assembly of DNA base molecules on Cu(111) surfacesSurface Science, 1996
- Imaging of Nucleic Acid Base Molecules on Pd(110) Surfaces by Scanning Tunneling MicroscopyJapanese Journal of Applied Physics, 1996
- Controlled Room-Temperature Positioning of Individual Molecules: Molecular Flexure and MotionScience, 1996
- Scanning tunnelling microscopy imaging of the DNA base molecules on reduced SrTiO3(100) surfacesMaterials Science and Engineering: C, 1995
- Scanning tunneling microscopy observation and theoretical calculation of the adsorption of adenine on Si(100)2 × 1 surfacesSurface Science, 1995
- Distinct imaging of the nucleic acid bases on SrTiO3(100) surface by scanning tunneling microscopyJournal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 1995
- Surface Structure and Electronic Property of Reduced SrTiO3(100) Surface Observed by Scanning Tunneling Microscopy/SpectroscopyJapanese Journal of Applied Physics, 1993
- Positioning single atoms with a scanning tunnelling microscopeNature, 1990