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[ subject:"Chemistry, Physical." ]
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Photochemical functionalization of h...
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The University of Wisconsin - Madison.
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Photochemical functionalization of hydrogen terminated silicon surfaces with functional organic alkenes.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Photochemical functionalization of hydrogen terminated silicon surfaces with functional organic alkenes./
作者:
Streifer, Jeremy A.
面頁冊數:
118 p.
附註:
Adviser: Robert J. Hamers.
Contained By:
Dissertation Abstracts International70-03B.
標題:
Chemistry, Physical. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3348932
ISBN:
9781109047691
Photochemical functionalization of hydrogen terminated silicon surfaces with functional organic alkenes.
Streifer, Jeremy A.
Photochemical functionalization of hydrogen terminated silicon surfaces with functional organic alkenes.
- 118 p.
Adviser: Robert J. Hamers.
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2008.
Molecular monolayers on silicon have recently been the focus of much interest due to the desire to integrate silicon based electronics with organic and biological systems to enable new and emerging technologies. This thesis explores a photochemical reaction that can be used as a way to covalently link organic and/or biological molecules to both macroscopic and nanoscale silicon surfaces. The reaction occurs when hydrogen terminated silicon surfaces are illuminated with either ultraviolet or visible light in the presence of organic 1-alkenes; this links the molecules to the surfaces with covalent Si-C bonds.
ISBN: 9781109047691Subjects--Topical Terms:
560527
Chemistry, Physical.
Photochemical functionalization of hydrogen terminated silicon surfaces with functional organic alkenes.
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Thesis (Ph.D.)--The University of Wisconsin - Madison, 2008.
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Molecular monolayers on silicon have recently been the focus of much interest due to the desire to integrate silicon based electronics with organic and biological systems to enable new and emerging technologies. This thesis explores a photochemical reaction that can be used as a way to covalently link organic and/or biological molecules to both macroscopic and nanoscale silicon surfaces. The reaction occurs when hydrogen terminated silicon surfaces are illuminated with either ultraviolet or visible light in the presence of organic 1-alkenes; this links the molecules to the surfaces with covalent Si-C bonds.
520
$a
Most of the work described here explores the photochemical reaction from a fundamental, mechanistic point of view. We show that there are at least two initiation mechanisms for the photochemical reactivity of silicon. A new initiation mechanism is proposed, whereby illumination of the silicon/alkene interface causes the direct photoemission of electrons from the silicon into the liquid alkene. This new mechanism occurs for high electron affinity alkenes (good electron acceptors) and high energy light. In contrast, reactions using low/negative electron affinity alkenes (poor electron acceptors) react by a mechanism that is initiated by the formation of a bulk hole/electron pair within the silicon substrate. These two mechanisms lead to drastic differences in reaction efficiencies, photopatterning resolution, and substrate doping dependencies. We demonstrate the ability to control the mechanism by changing the electronic properties of the reaction environment, and use this understanding to improve the overall photochemical reactivity of poorly-grafting molecules. Furthermore, we characterize the electronic structure of silicon surfaces that have been photochemically functionalized with a variety of alkenes and show that photoexcited carrier lifetimes at these functionalized surfaces correlates with sub-surface band-bending in the space-charge regions.
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Finally, a new analytical tool is described, based on attenuated total internal reflection Fourier transform infrared spectroscopy (ATR-FTIR), for the in-situ characterization of the formation of hybrid silicon/organic interfaces created using the photochemical reaction.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3348932
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