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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/13701

Title: Stable alignment of 4,4″-diamino-p-terphenyl chemically adsorbed on a Si(001)-(2 × 1) surface observed by scanning tunneling microscopy
Authors: Amer Hassan, Amer Mahmoud
Nishimura, Takashi
Sasahara, Akira
Murata, Hideyuki
Tomitori, Masahiko
Keywords: silicon
diamino-p-terphenyl
butterfly bonding
Scanning Tunneling Microscopy
Issue Date: 2014-07-23
Publisher: Elsevier
Magazine name: Surface Science
Volume: 630
Start page: 96
End page: 100
DOI: 10.1016/j.susc.2014.07.018
Abstract: Low coverages of 4,4″-diamino-p-terphenyl (DAT) molecules deposited on a Si(001)-(2 × 1) surface in ultrahigh vacuum at room temperature were observed by scanning tunneling microscopy (STM). The linear framework of DAT, consisting of a central benzene ring, two phenyl rings (terphenyl) and two amino groups at both ends, mostly lay down laterally on the surface. The majority of DATs were tilted at about 17° with respect to the direction of a Si dimer row on the surface, though a variety of DAT configuration with different angles was found by STM. The histograms of the tilted angles showed that the most frequent angle was 17°. The apparent height of DAT tilted at 17° looked hollow at the center and lower than that of other configurations of DAT in STM images. This indicates that the DAT tends to take a double arched shape at the tilted angle of 17° in a stable conformation with butterfly-like bonding through the central benzene ring to a Si dimer as well as through the two amino groups bonded to respective Si atoms on the dimer row.
Rights: Copyright (C)2014, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license (CC BY-NC-ND 4.0). [http://creativecommons.org/licenses/by-nc-nd/4.0/] NOTICE: This is the author's version of a work accepted for publication by Elsevier. Amer Mahmoud Amer Hassan, Takashi Nishimura, Akira Sasahara, Hideyuki Murata and Masahiko Tomitori, Surface Science, 630, 2014, 96-100, http://dx.doi.org/10.1016/j.susc.2014.07.018
URI: http://hdl.handle.net/10119/13701
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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