Influence of Molecular Ordering on Electrical and Friction Properties of ω-(trans-4-Stilbene)Alkylthiol Self-Assembled Monolayers on Au (111)

被引：21

作者：

Qi, Yabing ^{[1
,2
]}

Liu, Xiaosong ^{[3
]}

Hendriksen, B. L. M. ^{[1
]}

Navarro, V. ^{[1
]}

Park, Jeong Y. ^{[1
]}

Ratera, Imma ^{[1
]}

Klopp, J. M. ^{[4
]}

Edder, C. ^{[4
]}

Himpsel, Franz J. ^{[3
]}

Frechet, J. M. J. ^{[4
,5
]}

Haller, Eugene E. ^{[1
,6
]}

Salmeron, Miquel ^{[1
,4
,6
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Appl Sci & Technol Grad Grp, Berkeley, CA 94720 USA

[3] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Mol Foundry, Berkeley, CA 94720 USA

[5] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[6] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

来源：

LANGMUIR | 2010年 / 26卷 / 21期

关键词：

CHARGE-TRANSPORT PROPERTIES; ATOMIC-FORCE MICROSCOPY; CHAIN-LENGTH DEPENDENCE; ALKANETHIOL MONOLAYERS; STRUCTURAL-CHARACTERIZATION; AU(111); SURFACE; ABSORPTION; CONDUCTION; FILMS;

D O I：

10.1021/la100837g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The electrical and friction properties of omega-(trans-4-stilbene)alkylthiol self-assembled monolayers (SAMs) on Au(111) were investigated using atomic force microscopy (AFM) and near edge X-ray absorption One structure spectroscopy (NEXAFS). The sample surface was uniformly covered with a molecular film consisting of very small grains. Well-ordered and flat monolayer islands were formed after the sample was heated in nitrogen at 120 degrees C for 1 h. While lattice resolved A FM images revealed a crystalline phase in the islands, the area between islands showed no order. The islands exhibit substantial reduction (50%) in friction, supporting the existence of good ordering. NEXAFS measurements revealed an average upright molecular orientation in the film, both before and after heating, with a narrower tilt-angle distribution for the heated fim. Conductance-A FM measurements revealed a 2 orders of magnitude higher conductivity on the ordered islands than on the disordered phase. We propose that the conductance enhancement is a result of a better pi-pi stacking between the trans-stilbene molecular units as a result of improved ordering in islands.

引用

页码：16522 / 16528

页数：7

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