Covalently tethering porphyrin-based molecules to an otherwise inert gold substrate allows them to be imaged in an ambient environment using scanning tunneling microscopy. Interpretation of the data is aided by comparing images of mono- and diporphyrin molecules taken with the same tip. At low coverage we obtain a markedly larger average particle size (396 A2) for diporphyrins than for monoporphyrins (121 A2). The particle size distributions are very broad, but the images show a characteristic variation of contrast with tip bias, suggesting that the heterogeneity is due to different molecular conformations rather than contamination. We find evidence of ordered structures at high coverage.
|Number of pages||4|
|Publication status||Published - Mar 1992|
ASJC Scopus subject areas
- Colloid and Surface Chemistry
- Physical and Theoretical Chemistry