Interactions and structures of n-alkane thiol monolayers on gold surfaces

Nicholas Camillone III; T. Y. Becky Leung; Giacinto Scoles

doi:10.1117/12.180844

21 July 1994 Interactions and structures of n-alkane thiol monolayers on gold surfaces

Nicholas Camillone III, T. Y. Becky Leung, Giacinto Scoles

Proceedings Volume 2125, Laser Techniques for Surface Science; (1994) https://doi.org/10.1117/12.180844
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We report the results of low energy helium atom scattering studies of the surface structure of n-alkane thiol overlayers on gold surfaces. We show that the primitive unit mesh of conventionally prepared self-assembled monolayers is not a simple ((root)3X(root)3)R30deg hexagonal mesh but is in fact a 8.65X9.99 $angstrom rectangle [corresponding to a c(4(root)3X2(root)3)R30deg overlayer]. We also discuss the results of recent molecular-beam-deposition experiments which produce ordered (5(root)3X(root)3)R30deg and rectangular (root)3Xn (n$AP10) overlayers, structures quite distinct from the solution-grown c(4(root)3X2(root)3)R30deg structure. Finally, we report thermally-induced reorganization of conventionally prepared self-assembled c(4(root)3X2(root)3)R30deg monolayers into (5(root)3X(root)3)R30deg and (root)3Xn (n$AP10)lattices. These experiments suggest that the variety of structures observed results from dependence of the molecular packing upon coverage. Our observations demonstrate that the ordering of thiols on gold is not as simple as early studies have proposed; rather, adsorption of these molecules on gold results in a rich variety of structures, depending upon the coverage and, possibly, the means of preparation.

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Nicholas Camillone III, T. Y. Becky Leung, and Giacinto Scoles "Interactions and structures of n-alkane thiol monolayers on gold surfaces", Proc. SPIE 2125, Laser Techniques for Surface Science, (21 July 1994); https://doi.org/10.1117/12.180844

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