NDLI: Disorder–order phase change of ω-(N-pyrrolyl)alkanethiol self-assembled monolayers on gold induced by STM scans and thermal activation

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Lee, Joon Sung Chi, Young Shik Kim, Jinhee Yun, Wan Soo Choi, Insung S.
Description	Author Affiliation: Lee JS ( Department of Chemistry and School of Molecular Science (BK21), KAIST, Daejeon 305-701, Korea.)
Abstract	Molecular ordering of pyrrolyl -terminated alkanethiol self-assembled monolayers $(PyC_{n}SH$ SAMs) on Au(111) substrates (n = 11 or 12) was investigated by scanning tunneling microscopy ( STM ) and various spectroscopic methods. The SAMs, which were in a disordered state when formed at room temperature, could be ordered either globally by thermal annealing at 70 °C, or locally via stimulation with repetitive STM scans. The ordered phase was characterized by small domains of molecular rows formed along 〈11〉 directional set with an inter-row corrugation period close to 1.44 nm, in which defects were abundant. Based on the experimental results, the molecular arrangement in the ordered $PyC_{n}SH$ SAM was proposed to be a (5×√3)rect structure with a molecular deficiency ≥10%. While mechanical interactions between molecules and scanning probe tips had been pointed out as the major cause of scan-induced phase transformations in other SAM systems, electronic or electrostatic factors were thought to affect considerably the scan-induced ordering process in this SAM system. From comparison of surface molecular coverage between disordered and thermally ordered SAMs of $PyC_{12}SH,$ it was inferred that the disorder could be ascribed to both kinetic and thermodynamic factors. The kinetic barrier to the ordered phase was supposed to result from strong dipole–dipole interactions among the pyrrolyl endgroups.
File Format	HTM / HTML
ISSN	14639076
Issue Number	21
Journal	Physical Chemistry Chemical Physics
Volume Number	10
e-ISSN	14639084
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2008-06-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Physics Discipline Biophysics Discipline Chemistry
Alternative Title	Disorder-order phase change of omega-(N-pyrrolyl)alkanethiol self-assembled monolayers on gold induced by STM scans and thermal activation
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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