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Surface plasmon studies of thin film...

Ehler, Timothy Todd.

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Surface plasmon studies of thin films attached to silver and gold.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Surface plasmon studies of thin films attached to silver and gold./
Author:	Ehler, Timothy Todd.
Description:	113 p.
Notes:	Director: Lewis J. Noe.
Contained By:	Dissertation Abstracts International58-04B.
Subject:	Chemistry, Analytical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9730352
ISBN:	0591395975

Surface plasmon studies of thin films attached to silver and gold.
Ehler, Timothy Todd.

Surface plasmon studies of thin films attached to silver and gold. - 113 p.

Director: Lewis J. Noe.

Thesis (Ph.D.)--University of Wyoming, 1997.

Experimentally, the plasmon spectroscopy of thin, bilayer, silver/gold films on BK7 glass slides was investigated. Our results show that these bimetallic films present a superior plasmon spectrum with about half the attenuated total reflection bandwidth in comparison to that of pure gold films, for optimal Ag/Au thickness ratios. In applications involving self-assembled monolayers, SAMs, the surface plasmon analytical sensitivity is improved while retaining the advantages of the outer Au film for SAM preparation. Additionally our results strongly support evidence for the formation of alloy at the Ag/Au interface.

ISBN: 0591395975Subjects--Topical Terms:

586156
Chemistry, Analytical.

Surface plasmon studies of thin films attached to silver and gold.
LDR:04665nam 2200325 a 45 001 929502
005 20110427
008 110427s1997 ||||||||||||||||| ||eng d
020 $a 0591395975
035 $a (UnM)AAI9730352
035 $a AAI9730352
040 $a UnM $c UnM
100 1 $a Ehler, Timothy Todd. $3 1252990
245 1 0 $a Surface plasmon studies of thin films attached to silver and gold.
300 $a 113 p.
500 $a Director: Lewis J. Noe.
500 $a Source: Dissertation Abstracts International, Volume: 58-04, Section: B, page: 1898.
502 $a Thesis (Ph.D.)--University of Wyoming, 1997.
520 $a Experimentally, the plasmon spectroscopy of thin, bilayer, silver/gold films on BK7 glass slides was investigated. Our results show that these bimetallic films present a superior plasmon spectrum with about half the attenuated total reflection bandwidth in comparison to that of pure gold films, for optimal Ag/Au thickness ratios. In applications involving self-assembled monolayers, SAMs, the surface plasmon analytical sensitivity is improved while retaining the advantages of the outer Au film for SAM preparation. Additionally our results strongly support evidence for the formation of alloy at the Ag/Au interface.
520 $a A surface plasmon study on a variety of SAMs of n-alkanethiols, HS(CH$\rm\sb2)\sb{n}CH\sb3$ (n = 11, 13, 15, 17, 19), absorbed to silver and gold surfaces, in terms of thicknesses, indices, and tilt-angles was completed next. We found that the refractive indices for the alkanethiols attached to Ag increase gradually as alkyl chain length increases. Likewise, the refractive indices for Au increase gradually to an alkyl chain length of n = 17, at which point, its refractive index decreases slightly. The indices vary from a low value of 1.33 to 1.44. This gradual increase in index is not unexpected since it suggests that differences in packing and consequent bulk polarizability, $\chi\sp{(1)},$ is affected by alkyl chain length. A molecular mechanics (MM) minimized n-alkanethiol length and its corresponding experimental surface plasmon thickness were used to determine the tilt-angle for each of the various alkanethiols via a projection analysis. We found that the tilt-angles of the n-alkanethiols attached to Ag begin to increase from 0$\sp\circ$ starting with n = 15; however, the tilts of Au have an average of ${\sim}41\sp\circ,$ seemingly independent of carbon chain length.
520 $a In the next study we explain the synthesis of a novel rhenium complex, $\{fac$-Re(2,2$\sp\prime$-bipyridine) (CO)$\rm\sb3\ (NC\sb5H\sb4)\ CH\sb2NHCO(CH\sb2)\sb2 $s -$\}\sb2$ and its self-assembly behavior on Ag and Au, including characterization of the monolayer using surface plasmon spectroscopy (SPS). Surface enhanced Raman spectroscopy (SERS) and FTIR data were used to verify the self-assembly of the free ligand and rhenium complexes onto Ag to form SAMs. Vibrational analysis also provided evidence that the attachment of the free ligand and complexes to the metal substrate occurs by reaction of the disulfide bond, and not through the pyridine or bipyridine rings. Independently, a MM tilt angle was determined by minimization of a hexagonal grouping of six complexes surrounding one, each bound through an sp hybridized S-metal bond to a hollow surface site.
520 $a Finally, we addressed the in-situ study of the multilayer electropolymerization of Fe(vbpy)$\sb3\sp{2+}$ (vbpy is 4-vinyl-4$\sp\prime$-methyl-2,2$\sp\prime$-bipyridine) onto a thin gold electrode and demonstrated that SPS is a viable technique for this type of measurement. The robustness of the metal film necessary for electrochemical deposition is imparted by a thin film of 3-mercaptopropyl-trimethoxysilane attached to an SF-10 slide to which the metal film is covalently bonded. Though the sensitivity of the surface plasmon is unaffected by the silane film, the characteristic shape and angular position of the blank Au attenuated total reflection (ATR) curve changes slightly compared to that of non-treated glass substrate. We believe that the unusual shift behavior of the plasmon curve to higher internal angles and the decreased depth of the ATR minimum upon successive electropolymerized layer deposition can be explained in part by voids and grain size effects in the gold surface involved with the double layer. (Abstract shortened by UMI.)
590 $a School code: 0264.
650 4 $a Chemistry, Analytical. $3 586156
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Physics, Condensed Matter. $3 1018743
690 $a 0486
690 $a 0494
690 $a 0611
710 2 0 $a University of Wyoming. $3 1017859
773 0 $t Dissertation Abstracts International $g 58-04B.
790 $a 0264
790 1 0 $a Noe, Lewis J., $e advisor
791 $a Ph.D.
792 $a 1997
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9730352