TY - JOUR
T1 - Bonding and orientation in self-assembled monolayer of oligophenyldithiols on Au substrates
AU - Azzam, Waleed
AU - Wehner, Barbara I.
AU - Fischer, Roland A.
AU - Terfort, Andreas
AU - Wöll, Christof
PY - 2002/10/15
Y1 - 2002/10/15
N2 - The structure and orientation within prototype self-assembled monolayers (SAMs) containing aromatic subunits absorbed on Au substrates has been investigated using infrared (IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning tunneling microscopy (STM). Several oligophenyl(di)-thiols, namely biphenylthiol (HS-C6H4-C6H5, BPT), biphenyldithiol (HS-C6H4-C6H4-SH, BPDT), biphenyldimethyldithiol (HS-CH2-C6H4-C6H4-CH 2-SH, BPDMT), and terphenyldimethyldithiol (HS-CH2-C6H4-C6H4-C6 H4-CH2-SH, TPDMT) have been studied. At least one of these molecules, BPDT, has recently been discussed in connection with the fabrication of a simple electronic device using the aromatic oligophenylthiolate SAM as an active component. Our results reveal that organodithiols with a short oligophenyl backbone, that is, BPDT and BPDMT, do not form well oriented layers but demonstrate that longer backbones, for example, a terphenyl unit, do indeed lead to the formation of SAMs with a high degree of molecular orientation.
AB - The structure and orientation within prototype self-assembled monolayers (SAMs) containing aromatic subunits absorbed on Au substrates has been investigated using infrared (IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning tunneling microscopy (STM). Several oligophenyl(di)-thiols, namely biphenylthiol (HS-C6H4-C6H5, BPT), biphenyldithiol (HS-C6H4-C6H4-SH, BPDT), biphenyldimethyldithiol (HS-CH2-C6H4-C6H4-CH 2-SH, BPDMT), and terphenyldimethyldithiol (HS-CH2-C6H4-C6H4-C6 H4-CH2-SH, TPDMT) have been studied. At least one of these molecules, BPDT, has recently been discussed in connection with the fabrication of a simple electronic device using the aromatic oligophenylthiolate SAM as an active component. Our results reveal that organodithiols with a short oligophenyl backbone, that is, BPDT and BPDMT, do not form well oriented layers but demonstrate that longer backbones, for example, a terphenyl unit, do indeed lead to the formation of SAMs with a high degree of molecular orientation.
UR - http://www.scopus.com/inward/record.url?scp=0037109702&partnerID=8YFLogxK
U2 - 10.1021/la020426m
DO - 10.1021/la020426m
M3 - Article
AN - SCOPUS:0037109702
SN - 0743-7463
VL - 18
SP - 7766
EP - 7769
JO - Langmuir
JF - Langmuir
IS - 21
ER -