AVS 50th International Symposium
    Applied Surface Science Tuesday Sessions
       Session AS+BI-TuA

Paper AS+BI-TuA3
Low-Temperature STM Manipulation of Single Bio Molecules

Tuesday, November 4, 2003, 2:40 pm, Room 324/325

Session: Biomaterials Characterization
Presenter: J.J. Benson, Ohio University, Athens
Authors: J.J. Benson, Ohio University, Athens
V. Iancu, Ohio University, Athens
A. Deshpande, Ohio University, Athens
S.-W. Hla, Ohio University, Athens
Correspondent: Click to Email
Single porphyrin molecules adsorbed on Cu(111) surface are investigated by using a variety of manipulation procedures and spectro/microscopy measurements with a low temperature UHV STM at 6 K. The tunneling I/V and dI/dV spectroscopy techniques are used to probe the electronic properties of the single molecules with atomic level precision.@footnote 1@ Mechanical stability of single molecules is also examined using 'lateral manipulation' techniques with the STM-tip.@footnote 2@ In this procedure, the STM-tip is brought very close to the molecule to increase tip-molecule interactions (approximately one angstrom from the molecule). Then the tip is moved across the surface. Due to the tip-molecule interaction, the molecule is pushed across the substrate to relocate it to specific surface sites. Detailed internal conformation changes of the molecule can be directly monitored through the corresponding STM-tip height signals during the lateral manipulation process. These combined STM manipulation/spectroscopy investigations elucidate detailed information about the electronics and mechanical properties of the porphyrin molecules at sub-nanometer level resolutions. @FootnoteText@@footnote 1@F. Moresco et al, Phys. Rev. Lett. 86, 672-675, (2001). @footnote @@S.-W. Hla, K.-H. Rieder, Ann. Rev. Phys. Chem. 54, 307-330, (2003). .