Detail of "13373-97-2"

Reference

Characterization of Self-Assembled Alkanethiol Monolayers on Silver and Gold Using Surface Plasmon Spectroscopy

Characterization of Self-Assembled Alkanethiol Monolayers on Silver and Gold Using Surface Plasmon Spectroscopy. Ehler, Timothy T.; Malmberg, Nathan; Noe, Lewis J. (Department of Chemistry, University of Wyoming, Laramie, WY 82071, USA). Journal of Physical Chemistry B, 101(8), 1268-1272 (English) 1997 American Chemical Society. CODEN: JPCBFK. ISSN: 1089-5647. DOCUMENT TYPE: Journal CA Section: 66 (Surface Chemistry and Colloids) Section cross-reference(s): 73 We report the surface plasmon study on a variety of self-assembled monolayers (SAMs) of n-alkanethiols, HS(CH2)nCH3 (n = 11, 13, 15, 17, 19), adsorbed to silver and gold surfaces, in terms of thicknesses, indexes, and tilt-angles. We have found that the refractive indexes for the alkanethiols attached to Ag increase gradually as alkyl chain length increases. Likewise, the refractive indexes for Au increase gradually to an alkyl chain length of n = 18, at which point its refractive index decreases slightly. The indexes vary from a low value of 1.33 to 1.44. 13373-97-2 and 94594-37-3 are cas registry numbers of chemicals which are used as reagents here. This gradual increase in index is not unexpected since it suggests that differences in packing and consequent bulk polarizability, c(1), is affected by alkyl chain length. A mol. modeling minimized n-alkanethiol length and its corresponding exptl. surface plasmon thickness were used to det. the tilt-angle for each of the various alkanethiols via a projection anal. We found that the tilt-angles of the n-alkanethiols attached to Ag begin to increase from 0° starting with n = 15; however, the tilts on Au have an av. of ~41°, seemingly independent of carbon chain length. .

Molecular Orientation of Evaporated Pentacene Films on Gold: Alignment Effect of Self-Assembled Monolayer

Molecular Orientation of Evaporated Pentacene Films on Gold: Alignment Effect of Self-Assembled Monolayer. Hu, W. S.; Tao, Y. T.; Hsu, Y. J.; Wei, D. H.; Wu, Y. S. (Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan). Langmuir, 21(6), 2260-2266 (English) 2005 American Chemical Society. CODEN: LANGD5. ISSN: 0743-7463. DOCUMENT TYPE: Journal CA Section: 66 (Surface Chemistry and Colloids) Pentacene films deposited on self-assembled monolayers (SAMs) bearing different terminal functional groups have been studied by reflection-absorption IR, grazing angle XRD, NEXAFS, AFM, and SEM analyses. A film with pentacene mols. nearly perpendicularly oriented was obsd. on Au surfaces covered with an SAM of alkanethiol deriv. of X-(CH2)n-SH, with X = -CH3, -COOH, -OH, -CN, -NH2, C60, or an arom.Chemical with cas number 13373-97-2 also plays role. thiol p-terphenylmethanethiol. On the other hand, a film with the pentacene mol. plane nearly parallel to the substrate surface was found on bare Au surface. A similar mol. orientation was found in thinner (~5 nm) and thicker (100 nm) deposited films. Films deposited on different surfaces exhibit distinct morphologies: with apparently smaller and rod-shaped grains on clean bare Au surface but larger and islandlike crystals on SAM-modified surfaces. X-ray photoemission electron microscopy (X-PEEM) was used to analyze the orientation of pentacene mols. deposited on a SAM-patterned Au surface. With the micro-NEXAFS spectra and PEEM image anal., the microarea-selective orientation control on Au was characterized. The ability to control the packing orientation in org. mol. crystals is of great interest in fabricating org. field effect transistors because of the anisotropic nature of charge transport in org. semiconducting materials. .