Functional Group Identification in Scanning Tunneling Microscopy of Molecular Adsorbates

1996 ◽  
Vol 100 (32) ◽  
pp. 13747-13759 ◽  
Author(s):  
Donna M. Cyr ◽  
Bhawani Venkataraman ◽  
George W. Flynn ◽  
Andrew Black ◽  
George M. Whitesides
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Functional Group ◽  
Group Identification ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Molecular Adsorbates

Pressure and resonance effects in scanning tunneling microscopy of molecular adsorbates

1990 ◽  
Vol 94 (11) ◽  
pp. 4655-4660 ◽  
Author(s):  
S. M. Lindsay ◽  
O. F. Sankey ◽  
Y. Li ◽  
C. Herbst ◽  
A. Rupprecht
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Resonance Effects ◽  
Molecular Adsorbates

Polypyrrole-Modified Tips for Functional Group Recognition in Scanning Tunneling Microscopy

1999 ◽  
Vol 71 (9) ◽  
pp. 1699-1705 ◽  
Author(s):  
Takashi Ito ◽  
Philippe Bühlmann ◽  
Yoshio Umezawa
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Functional Group ◽  
Scanning Tunneling ◽  
Tunneling Microscopy

Self-Assembly and Functional Group Effect of Asymmetric Disulfides on Graphite Studied by Scanning Tunneling Microscopy

1999 ◽  
Vol 38 (Part 1, No. 6B) ◽  
pp. 3897-3900 ◽  
Author(s):  
Jaegeun Noh ◽  
Dongsun Lee ◽  
Masahiko Hara ◽  
Haiwon Lee ◽  
Hiroyuki Sasabe ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Self Assembly ◽  
Functional Group ◽  
Scanning Tunneling ◽  
Group Effect ◽  
Tunneling Microscopy

Functional Group Contrast in Scanning Tunneling Microscopy Images of Substituted Phenylethers

2001 ◽  
Vol 7 (S2) ◽  
pp. 850-851
Author(s):  
I. H. Musselman ◽  
K. H. Kangasniemi ◽  
A. J. M. Lubag ◽  
J. K. Franceschetti ◽  
H. S. Lee ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Functional Group ◽  
Energy Levels ◽  
Pyrolytic Graphite ◽  
Image Interpretation ◽  
Adsorbed Molecule ◽  
Scanning Tunneling ◽  
Chemical Information ◽  
Tunneling Microscopy ◽  
Stm Images

Numerous scanning tunneling microscopy (STM) studies of adsorbates at gas/solid and liquid/solid interfaces have been reported. Although early STM experiments of these systems were concerned primarily with visualizing molecules at the atomic level, the focus has shifted to extracting chemical information from STM images, including the identity of atoms or of functional groups within an adsorbed molecule. However, STM image interpretation continues to be an immense challenge and one currently debated issue of critical importance is the mechanism(s) by which the image contrast reveals atomic and molecular structure. Recently, a combination of electronic and geometric factors was proposed. The electronic factor addresses the coupling between the energy levels of the adsorbate and the Fermi level of the surface whereas the geometric factor is related to the spatial overlap between the STM tip and the functional group.A previous study in our laboratory of a homologous series of para-halogenated phenyloctadecyl ethers (X-POEs, where X = H, CI, Br, I), physisorbed onto highly oriented pyrolytic graphite (HOPG), revealed a bias-dependent contrast in STM images resembling calculated (HyperChem) electron density contours of bonding molecular orbitals.

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