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The striped phases of ethylthiolate monolayers on the Au(111) surface: A scanning tunneling microscopy study
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10.1063/1.4806969
/content/aip/journal/jcp/138/19/10.1063/1.4806969
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/19/10.1063/1.4806969
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Figures

Image of FIG. 1.
FIG. 1.

(a) STM image, 72 nm × 65 nm, obtained using 2.0 V sample bias and 0.3 nA tunneling current, from Au(111) covered by a mixed layer of (3 × 4) and a striped phase. (b) Magnified view of the (3 × 4) phase, 5.5 nm × 6 nm. Each AAD unit is seen as a pair of bright spots in the image. Ball and stick models are used to illustrate the locations of the AAD units.

Image of FIG. 2.
FIG. 2.

(a) STM image, 22 nm × 9 nm, obtained using 2.0 V sample bias and 0.3 nA tunneling current, showing the spatial relationship between the (3 × 4) and the striped phase. (b) High-resolution image of the striped phase. 9 nm × 7.5 nm. A (5√3 × √3)-R30° unit cell is marked.

Image of FIG. 3.
FIG. 3.

(a) Ball model of the (5√3 × √3)-R30° striped phase showing the steric limits of the molecules. Au adatoms: orange spheres; S: light blue spheres; C: purple spheres; H: yellow spheres. (b) Simulated height profile for this model. (c) STM image with triangulation and corrected for skew distortion.

Image of FIG. 4.
FIG. 4.

(a) STM image, 11 nm × 12 nm, obtained using 2.0 V sample bias and 0.3 nA tunneling current, of the (6√3 × √3)-R30° phase. (b) Image, 18.5 nm × 17.5 nm, with both the (5√3 × √3)-R30° and the (6√3 × √3)-R30° phase present, and hence allowing the accurate determination of the stripe period for the (6√3 × √3)-R30° phase. (c) Ball model of the (6√3 × √3)-R30° phase.

Image of FIG. 5.
FIG. 5.

(a) STM image, 48 nm × 37 nm, obtained using 2.0 V sample bias and 0.3 nA tunneling current, showing the presence of isolated AAD rows next to the (6√3 × √3)-R30° phase.

Image of FIG. 6.
FIG. 6.

STM images, 30 nm × 30 nm, obtained using −0.6 V sample bias and 0.05 nA tunneling current, from the same area of the sample.

Image of FIG. 7.
FIG. 7.

STM images, 40 nm × 40 nm, obtained using −0.2 V sample bias and 0.05 nA tunneling current, showing the minority (5√3 × √3)-R30° and (5 × √3)-rect. phases embedded in an ordered (5√3 × √3)-R30° phase. Rectangles highlight the (5 × √3)-rect. phase. (b) STM image with the co-existence of the (5 × √3)-rect. and the (5√3 × √3)-R30° phase, allowing the determination of the stripe period for the (5 × √3)-rect. phase. Imaging parameters; −0.2 V, 0.5 nA. (c) Structural model of the (5 × √3)-rect. phase involving the proposed di-Au-adatom-tri-thiolate complex. (d) STM image, 25 nm × 25 nm, obtained using −0.2 V sample bias and 0.05 nA tunneling current, showing the co-existence of multiple striped phases.

Image of FIG. 8.
FIG. 8.

(a) STM images, 25 nm × 25 nm, obtained using −0.2 V sample bias and 0.5 nA tunneling current, showing striped phases with various periods. (b) Magnified view of the stripes with the 10.5 spacing. The rectangular (10.5 × √3)-rect. unit cell looks distorted due to drift.

Image of FIG. 9.
FIG. 9.

Direct comparison between ball model for the (5 × √3)-rect. phase and a STM image. Same color scheme is used as that in Fig. 3(a) . The STM image has not been corrected for skew distortion.

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/content/aip/journal/jcp/138/19/10.1063/1.4806969
2013-05-20
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The striped phases of ethylthiolate monolayers on the Au(111) surface: A scanning tunneling microscopy study
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/19/10.1063/1.4806969
10.1063/1.4806969
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