Chain length dependence of the striped phases of alkanethiol monolayers self-assembled on Au(111): An atomic beam diffraction study
- Princeton Univ., NJ (United States)
Low-energy helium atom diffraction measurements of the surface structure of n-alkanethiol films deposited from a molecular beam on to the (111) face of gold single crystals (at an impingement rate on the order of 10{sup 11{+-}1} molecules cm{sup -2} s{sup -1}) show that the thiols form `striped` overlayers. These structures are similar to those previously seen by Dubois et al. in a recent low energy electron diffraction (LEED) study of vapor-deposited overlayers by Poirier et al. in a scanning tunneling microscope (STM) study of low coverage solution-grown short-chain thiols monolayers, and more recently by us, Poirier, and Tarlov by thermal treatment of the full-coverage c(4{radical}3x2{radical}3)R30{degree} phase formed in the standard way by self-assembly from solution. The surface periodicity of the monolayer structures observed in the present study can be described (with respect to the Au(111) surface lattice) in terms of a rectangular p x {radical}3 unit mesh where p, the periodicity of the stripes, scales linearly with the length of the adsorbed thiol. The absolute value of the stripes` period is, with a maximum deviation of 3%, 1.9 times the length of the corresponding fully stretched thiolate fragment which coincides with the length of the corresponding fully stretched dialkyl disulfide. 28 refs., 11 figs., 1 tab.
- DOE Contract Number:
- FG02-93ER45503
- OSTI ID:
- 263199
- Journal Information:
- Langmuir, Journal Name: Langmuir Journal Issue: 11 Vol. 12; ISSN 0743-7463; ISSN LANGD5
- Country of Publication:
- United States
- Language:
- English
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