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Molecular-level investigations of mo...

Yang, Guohua.

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Molecular-level investigations of model membrane systems: A scanning tunneling microscopy and nanoengineering approach.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Molecular-level investigations of model membrane systems: A scanning tunneling microscopy and nanoengineering approach./
作者:	Yang, Guohua.
面頁冊數:	168 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0766.
Contained By:	Dissertation Abstracts International65-02B.
標題:	Chemistry, Physical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3121013
ISBN:	0496683683

Molecular-level investigations of model membrane systems: A scanning tunneling microscopy and nanoengineering approach.
Yang, Guohua.

Molecular-level investigations of model membrane systems: A scanning tunneling microscopy and nanoengineering approach. - 168 p.

Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0766.

Thesis (Ph.D.)--University of California, Davis, 2003.

Organothiol self-assembled monolayers (SAMs) on Au(111) have been represented as model membrane systems. The first project addresses the periodicity, defects, morphology, and coverage-dependent phases during the self-assembly process of organothiols. Molecular-resolution studies reveal that the structure of organothiol self-assembled monolayers (SAMs) on Au(111) critically depends on the surface coverage, molecular termini, and molecular backbones. In addition, the concept of regulating interfacial properties by introducing various functional groups is validated, although further work remains to systematically correlate the structure and property.

ISBN: 0496683683Subjects--Topical Terms:

560527
Chemistry, Physical.

Molecular-level investigations of model membrane systems: A scanning tunneling microscopy and nanoengineering approach.
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245 1 0 $a Molecular-level investigations of model membrane systems: A scanning tunneling microscopy and nanoengineering approach.
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500 $a Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0766.
500 $a Adviser: Gang-yu Liu.
502 $a Thesis (Ph.D.)--University of California, Davis, 2003.
520 $a Organothiol self-assembled monolayers (SAMs) on Au(111) have been represented as model membrane systems. The first project addresses the periodicity, defects, morphology, and coverage-dependent phases during the self-assembly process of organothiols. Molecular-resolution studies reveal that the structure of organothiol self-assembled monolayers (SAMs) on Au(111) critically depends on the surface coverage, molecular termini, and molecular backbones. In addition, the concept of regulating interfacial properties by introducing various functional groups is validated, although further work remains to systematically correlate the structure and property.
520 $a The second project summarizes a molecular level approach for inhibiting the degradation processes (oxidation and desorption) of alkanethiol SAMs on gold, by adding small amounts of amphiphilic surfactant molecules in aqueous solutions such as N,N-dimethylformamide (DMF) or dimethyl sulfoxide (DMSO). High-resolution studies suggest that amphiphilic molecules attach to the SAM surface, and at defect sites with higher favorability, forming relatively stable adsorbates. The formation of this protective layer at defect sites increases the activation energy of both degradation pathways sufficiently to inhibit them at room temperature.
520 $a Finally, STM tip-surface interactions can be tuned to effectively mimic the interfacial junctions in metal-molecule-metal devices. A new method, based on scanning tunneling spectroscopy, enables the measurement of electrical conductivity and the breakdown threshold voltage of single alkanethiol molecules on gold. The results demonstrate that combining structural characterization with spectroscopic measurements is critical for understanding the electronic properties of molecular devices. Using the high local electric field and tunneling current between the sample and tip, STM has been applied for nanofabrication of alkanethiol SAMs on gold with nanometer level precision. The resulting nanostructures was characterized and modified in situ.
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