Scanning tunneling microscopy of self-assembled phenylene ethynylene oligomers on Au(111) substrates

Reference:

Walzer, K., Marx, E., Greenham, N. C., Less, R. J., Raithby, P. R. and Stokbro, K., 2004. Scanning tunneling microscopy of self-assembled phenylene ethynylene oligomers on Au(111) substrates. Journal of the American Chemical Society, 126 (4), pp. 1229-1234.

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Abstract

In this paper, we report the self-assembly, electrical characterization, and surface modification of dithiolated phenylene-ethynylene oligomer monolayers on a Au(111) surface. The self-assembly was accomplished by thiol bonding the molecules from solution to a Au(111) surface. We have confirmed the formation of self-assembled monolayers by scanning tunneling microscopy (STM) and optical ellipsometry, and have studied the kinetics of film growth. We suggest that self-assembled phenylene ethynylene oligomers on Au(111) surfaces grow as thiols rather than as thiolates. Using low-temperature STM, we collected local current-voltage spectra showing negative differential resistance at 6 K.

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