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Formation and reactivity of alkylsil...

Owens, Thomas Michael.

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Formation and reactivity of alkylsilane-based monolayers on gold.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Formation and reactivity of alkylsilane-based monolayers on gold./
Author:	Owens, Thomas Michael.
Description:	162 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2949.
Contained By:	Dissertation Abstracts International65-06B.
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3137913
ISBN:	0496850830

Formation and reactivity of alkylsilane-based monolayers on gold.
Owens, Thomas Michael.

Formation and reactivity of alkylsilane-based monolayers on gold. - 162 p.

Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2949.

Thesis (Ph.D.)--University of Michigan, 2004.

Chemisorbed monolayers of alkylsilanes on gold have been synthesized under ultrahigh vacuum (UHV) conditions and characterized using synchrotron and conventional X-ray photoemission spectroscopy (XPS), reflection-absorption infrared spectroscopy (RAIRS) and scanning tunneling microscopy (STM). Hexylsilane (C6H13SiH3), octylsilane (C8H 17SiH3), and octadecylsilane (C18H37SiH 3) were employed. Monolayer were synthesized by exposing freshly evaporated Au samples to the chosen silane in UHV. Saturation occurred after exposure to &sim;400 Langmuir. Multilayer formation is not observed. Monolayer formation proceeds through the reductive elimination of the Si-H bonds and formation of three Si-Au bonds. Based on the narrow full width at half maximum of the Si 2p core level (&sim;0.4 eV), the Si atoms of the monolayer are in a chemically homogeneous environment. X-ray photoemission valence band spectra indicate the alkyl chains are intact in the monolayer. The alkylchains are oriented nearly perpendicular to the surface and &sim;96% of the surface is covered by the monolayer, as determined by variable energy XPS. Upon exposure to ambient, rapid oxidation (<15 minutes) of the Si head group produces a physisorbed siloxane monolayer. Exposure to O2 and H2O in vacuo do not result in oxidation of the monolayer. Exposure to ozone generates the physisorbed siloxane monolayer. Further ozone exposure results in oxidation of the alkylchain, consistent with the formation of alcohol and carboxylic acid species. Displacement of chemisorbed molecules has been observed through the reaction of octylsilane with a monolayer of H8Si 8O12 on Au. The resulting monolayer composition is &sim;70/30 (octylsilane/H8Si8O12). The displacement reaction is self limiting at this ratio. Analogous monolayers have been synthesized for octylgermane (C8H17GeH3) on gold.

ISBN: 0496850830Subjects--Topical Terms:

560527
Chemistry, Physical.

Formation and reactivity of alkylsilane-based monolayers on gold.
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020 $a 0496850830
035 $a (UnM)AAI3137913
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100 1 $a Owens, Thomas Michael. $3 1935784
245 1 0 $a Formation and reactivity of alkylsilane-based monolayers on gold.
300 $a 162 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2949.
500 $a Chair: Mark M. Banaszak Holl.
502 $a Thesis (Ph.D.)--University of Michigan, 2004.
520 $a Chemisorbed monolayers of alkylsilanes on gold have been synthesized under ultrahigh vacuum (UHV) conditions and characterized using synchrotron and conventional X-ray photoemission spectroscopy (XPS), reflection-absorption infrared spectroscopy (RAIRS) and scanning tunneling microscopy (STM). Hexylsilane (C6H13SiH3), octylsilane (C8H 17SiH3), and octadecylsilane (C18H37SiH 3) were employed. Monolayer were synthesized by exposing freshly evaporated Au samples to the chosen silane in UHV. Saturation occurred after exposure to &sim;400 Langmuir. Multilayer formation is not observed. Monolayer formation proceeds through the reductive elimination of the Si-H bonds and formation of three Si-Au bonds. Based on the narrow full width at half maximum of the Si 2p core level (&sim;0.4 eV), the Si atoms of the monolayer are in a chemically homogeneous environment. X-ray photoemission valence band spectra indicate the alkyl chains are intact in the monolayer. The alkylchains are oriented nearly perpendicular to the surface and &sim;96% of the surface is covered by the monolayer, as determined by variable energy XPS. Upon exposure to ambient, rapid oxidation (<15 minutes) of the Si head group produces a physisorbed siloxane monolayer. Exposure to O2 and H2O in vacuo do not result in oxidation of the monolayer. Exposure to ozone generates the physisorbed siloxane monolayer. Further ozone exposure results in oxidation of the alkylchain, consistent with the formation of alcohol and carboxylic acid species. Displacement of chemisorbed molecules has been observed through the reaction of octylsilane with a monolayer of H8Si 8O12 on Au. The resulting monolayer composition is &sim;70/30 (octylsilane/H8Si8O12). The displacement reaction is self limiting at this ratio. Analogous monolayers have been synthesized for octylgermane (C8H17GeH3) on gold.
590 $a School code: 0127.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Chemistry, Inorganic. $3 517253
650 4 $a Physics, Condensed Matter. $3 1018743
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690 $a 0488
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710 2 0 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 65-06B.
790 1 0 $a Banaszak Holl, Mark M., $e advisor
790 $a 0127
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3137913