Self-Assembled Monolayers on Pt(111): Molecular Packing Structure and Strain Effects Observed by Scanning Tunneling Microscopy
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- 作者：Sangyeob Lee ; Jung Park ; Regina Ragan ; Sehun Kim ; Zonghoon Lee ; Do Kyung Lim ; Douglas A. A. Ohlberg ; and R. Stanley Williams
- 刊名：Journal of the American Chemical Society
- 出版年：2006
- 出版时间：May 3, 2006
- 年：2006
- 卷：128
- 期：17
- 页码：5745 - 5750
- 全文大小：1062K
- 年卷期：v.128,no.17(May 3, 2006)
- ISSN：1520-5126
文摘
Self-assembled monolayers (SAMs) of octanethiol and benzeneethanethiol were deposited onclean Pt(111) surfaces in ultrahigh vacuum (UHV). Highly resolved images of these SAMs produced by anin situ scanning tunneling microscope (STM) showed that both systems organize into a super-structuremosaic of domains of locally ordered, closely packed molecules. Analysis of the STM images indicated a(
× 
)R30
unit cell for the octanethiol SAMs and a 4(
× 
)R30 periodicity based on 2 × 2basic molecular packing for the benzeneethanethiol SAMs under the coverage conditions investigated.SAMs on Pt(111) exhibited differences in molecular packing and a lower density of disordered regionsthan SAMs on Au(111). Electron transport measurements were performed using scanning tunnelingspectroscopy. Benzeneethanethiol/Pt(111) junctions exhibited a higher conductance than octanethiol/Pt(111)junctions.
× )R30 unit cell for the octanethiol SAMs and a 4( × )R30 periodicity based on 2 × 2basic molecular packing for the benzeneethanethiol SAMs under the coverage conditions investigated.SAMs on Pt(111) exhibited differences in molecular packing and a lower density of disordered regionsthan SAMs on Au(111). Electron transport measurements were performed using scanning tunnelingspectroscopy. Benzeneethanethiol/Pt(111) junctions exhibited a higher conductance than octanethiol/Pt(111)junctions.