scholarly journals Electron-Transfer Properties of Phenyleneethynylene Linkers Bound to Gold via a Self-Assembled Monolayer of Molecular Tripod

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2893 ◽  
Author(s):  
Toshikazu Kitagawa ◽  
Takashi Kawano ◽  
Takahiro Hase ◽  
Ikuma Hayakawa ◽  
Katsuyuki Hirai ◽  
...  
Keyword(s):  
Electron Transfer ◽  
High Surface ◽  
Gold Surface ◽  
Solid Surfaces ◽  
Self Assembled Monolayers ◽  
Self Assembled Monolayer ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Electron Transfer Properties ◽  
Transfer Properties

The three-point adsorption of tripod-shaped molecules enables the formation of robust self-assembled monolayers (SAMs) on solid surfaces, where the component molecules are fixed in a strictly upright orientation. In the present study, SAMs of a rigid molecular tripod consisting of an adamantane core and three CH2SH groups were employed to arrange ferrocene on a gold surface through oligo(p-phenyleneethynylene) linkers. Cyclic voltammetry of the monolayers demonstrated high surface coverage of ferrocene, yet the molecular interaction among adjacent ferrocene units was negligible. This was because of the extended intermolecular distance caused by the bulky tripod framework. The rates of electron transfer from the ferrocene to the gold surface through different linker lengths were determined by electrochemical measurements, from which the decay factor for oligo(p-phenyleneethynylene) wire was evaluated.

Spectral and cyclic voltammetric characterization of self-assembled monolayers on gold of pyrene end-labeled oligonucleotide duplexes

1999 ◽  
Vol 77 (5-6) ◽  
pp. 1077-1084 ◽  
Author(s):  
R Scott Reese ◽  
Marye Anne Fox
Keyword(s):  
Gold Surface ◽  
Self Assembled Monolayers ◽  
Self Assembled Monolayer ◽  
Surface Emission ◽  
Assembled Monolayers ◽  
Oligonucleotide Duplex ◽  
Self Assembled ◽  
Duplex Formation

Self-assembled monolayers of sulfur-terminated oligonucleotide duplexes were formed on flat gold surfaces, either by exposure of a self-assembled monolayer bearing one oligonucleotide strand to the complementary strand or by preformation of a oligonucleotide duplex that was then deposited on a fresh gold surface. Virtually identical spectral behavior was observed whether the duplex was produced before deposition or by in situ complementary association. With a duplex bearing an appropriate pyrene end-label, the resulting thin film was photoresponsive. Surface emission measurements show no evidence for pyrene aggregation on the modified surfaces. The polarity of the photocurrent, reflecting photoinduced electron transfer initiated by photoexcitation of pyrene, is opposite that expected from the oligonucleotide-mediated reduction of the appended pyrene excited state.Key words: oligonucleotide, self-assembled monolayer, duplex formation, photoelectrochemistry, surface emission.

Specific Immobilization of Streptavidin on Mixed Self-Assembled Monolayers as Mixing Ratio

2007 ◽  
Vol 121-123 ◽  
pp. 495-498 ◽  
Author(s):  
Jun Hyung Park ◽  
Buyng Su Park ◽  
Gu Huh ◽  
Seung Hyun Lee ◽  
Hyun Sook Lee ◽  
...  
Keyword(s):  
Colorimetric Detection ◽  
Gold Surface ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Local Domain ◽  
Mixing Ratio ◽  
Tunneling Microscopy ◽  
Self Assembled Monolayer ◽  
Assembled Monolayers ◽  
Self Assembled

We report on the distribution of mixed self-assembled monolayers (SAMs) composed of biotinylated and diluent alkylthiolates for streptavidin immobilization. Two thiol derivatives, 11-mercapto-1-undecanol (MUOH) and 11-mercaptoundecanoic-(8-biotinylamido-3,6-dioxaoctyl) amide (MBDA), were employed for mixed SAM. These thiols formed self-assembled monolayer without local domain, and streptavidins were immobilized onto biotinylated gold surface without nonspecific binding. In order to find the optimized condition of immobilization of streptavidin, we controlled the mixing ratio of two kind thiols by colorimetric detection assay, and the immobilization was characterized by atomic force microscopy (AFM), scanning tunneling microscopy (STM), and ellipsometer.

Electron Transfer Behavior through Densely Packed Self-Assembled Monolayers of a Novel Heteroaromatic Thiol Derivative onto the Gold Surface

2008 ◽  
Vol 20 (5) ◽  
pp. 513-519 ◽  
Author(s):  
Mojtaba Shamsipur ◽  
Sayed Habib Kazemi ◽  
Ali Mehdinia ◽  
Mir Fazlollah Mousavi ◽  
Hashem Sharghi
Keyword(s):  
Electron Transfer ◽  
Gold Surface ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Transfer Behavior ◽  
Self Assembled

INFLUENCE OF CONSTITUTION OF HYBRID FERROCENYL ALKANETHIOLS SELF-ASSEMBLED MONOLAYERS TO INTERFACIAL CHARACTERISTICS ON GOLD SURFACE

2010 ◽  
Vol 22 (01) ◽  
pp. 25-31
Author(s):  
Jhen-Gang Huang ◽  
Adam Shih-Yuan Lee ◽  
Shu-Fang Chu ◽  
Yun-Han Lin ◽  
Chii-Wann Lin
Keyword(s):  
Molar Fraction ◽  
Gold Surface ◽  
Self Assembled Monolayers ◽  
Low Power Consumption ◽  
Self Assembled Monolayer ◽  
Oxidation Potentials ◽  
Random Arrangement ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Interfacial Characteristics

The interfacial characteristics of self-assembled monolayer (SAM), that are applied in miniaturized sensor design, were strongly influenced by the SAM constitution. The electrochemical and interfacial characteristics of hybrid SAMs that constituted with ferrocenyl octanethiol ( FcC 8 SH ) and unsubstituted octanethiol ( C 8) or 2-mercaptopyrimidine (2-MPD) were investigated in this study. The peaks of anodic oxidation were observed at around 0.49 V (vs. Ag/AgCl ) in the FcC 8 SH/C 8 hybrid SAM. However, the oxidation potentials descended from 0.42–0.38 V as the molar fraction of FcC 8 SH was decreased from 0.8–0.2 in the FcC 8 SH /2-MPD hybrid SAM. On the other hand, the interfacial hydrophilicity of FcC 8 SH /2-MPD hybrid SAM was measured to be higher than the FcC 8 SH/C 8 hybrid SAM due to the random arrangement of SAM caused by the shape of 2-MPD. Then, the surface roughness of hybrid SAM and chain length of ferrocenyl alkanethiols were all considered to be the parameters of interfacial characteristics. In summary, doping of 2-MPD in SAMs might reduce the rigidity of ferrocenyl alkanethiol SAMs and increase the interfacial hydrophilicity. This result will be useful in the development of the low power consumption portable bioanalytical system. And a miniaturized bioanalytical system based on ferrocenyl SAMs would be developed in the future.

Self-Assembled Monolayers of Heme Derivatives on a Gold Surface

2000 ◽  
Vol 73 (9) ◽  
pp. 1993-2000 ◽  
Author(s):  
Kazutoshi Kobayashi ◽  
Shin'ichiro Imabayashi ◽  
Katsuhiko Fujita ◽  
Kazuhide Nonaka ◽  
Takashi Kakiuchi ◽  
...  
Keyword(s):  
Gold Surface ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled
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