DIFFERENTIATING FUNCTIONAL-GROUPS WITH THE SCANNING TUNNELING MICROSCOPE
Venkataraman, B; Flynn, GW; Wilbur, JL; Folkers, JP; Whitesides, GM
| HERO ID | 1734002 |
|---|---|
| In Press | No |
| Year | 1995 |
| Title | DIFFERENTIATING FUNCTIONAL-GROUPS WITH THE SCANNING TUNNELING MICROSCOPE |
| Authors | Venkataraman, B; Flynn, GW; Wilbur, JL; Folkers, JP; Whitesides, GM |
| Journal | Journal of Physical Chemistry |
| Volume | 99 |
| Issue | 21 |
| Page Numbers | 8684-8689 |
| Abstract | Scanning tunneling microscopy (STM) images of 1-docosanol, 1-docosanethiol, didocosyl disulfide, and 1-chlorooctadecane on graphite are compared. The images of the 1-docosanethiol and didocosyl disulfide show bright spots which are attributed to the positions of the S-H and S-S functional groups. The STM images of the 1-docosanol and 1- chlorooctadecane do not show such bright spots. The fact that both the S-H and S-S groups appear bright in the STM images indicates that the presence of an S atom on graphite results in a higher tunneling current when the tip scans over it compared to the tunneling current over a C, O, or Cl atom. The different behavior of the S atoms compared to the O, C, and Cl atoms is discussed in terms of the interactions between these atoms and the underlying graphite substrate. The persistent brightness of S atoms in the images of molecular adsorbates suggests that sulfur may serve as a useful ''chromophore'' for molecules imaged by STM. |
| Doi | 10.1021/j100021a038 |
| Wosid | WOS:A1995RA14700038 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science WOS:A1995RA14700038 Journal:JOURNAL OF PHYSICAL CHEMISTRY 0022-3654 |
| Is Public | Yes |