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

K Walzer, E Marx, N C Greenham, R J Less, P R Raithby, K Stokbro

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54 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)1229-1234
Number of pages6
JournalJournal of the American Chemical Society
Volume126
Issue number4
DOIs
Publication statusPublished - 2004

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