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Electrochemical and spectroscopic st...

Baker, Wendy S.

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Electrochemical and spectroscopic studies of novel electroactive nanostructures.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Electrochemical and spectroscopic studies of novel electroactive nanostructures./
Author:	Baker, Wendy S.
Description:	172 p.
Notes:	Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 1817.
Contained By:	Dissertation Abstracts International63-04B.
Subject:	Chemistry, Analytical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3051582
ISBN:	0493662057

Electrochemical and spectroscopic studies of novel electroactive nanostructures.
Baker, Wendy S.

Electrochemical and spectroscopic studies of novel electroactive nanostructures. - 172 p.

Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 1817.

Thesis (Ph.D.)--Texas A&M University, 2002.

The first objective of this research was to examine the electrochemical behavior of arrays of nanometer-scale electrodes for agreement with existing microelectrode theory. The randomly-dispersed electrodes were prepared by cyanide etching of a Au(111) substrate passivated by a <italic>n</italic>-hexadecanethiol monolayer. The electrode arrays were characterized by scanning tunneling microscopy (STM) and electrochemistry to determine if the measured electrode geometries predict the observed electrochemical response. A second objective was to probe for size-selective molecular recognition behavior at the nanoscale electrodes. For this purpose, a series of viologen-functionalized poly(amidoamine) (PAMAM) dendrimers having hydrodynamic radii ranging from 2 to 4 nm were prepared and electrochemically and spectroscopically characterized. It was found that the electrochemical behavior of the viologenated dendrimers at the nanoelectrode arrays was complicated by adsorption effects. Alternate methods for performing the size-based molecular recognition studies which circumvent the adsorption problem are proposed. An additional investigation was performed to probe the structure of metal ion-coordinated bilayers on Au. In this study, a monolayer of 4-mercaptobenzoic acid on Au was linked to an upper-layer of <italic>n </italic>-hexadecanethiol via a Cu- or Ag-coordinating metal ion. The bilayers were studied by Fourier transform infrared-external reflectance spectroscopy (FTIR-ERS), ellipsometry, X-ray photoelectron spectroscopy (XPS), and time-of-flight secondary ion mass spectrometry (TOF-SIMS). This study demonstrated that the Ag-coordinated bilayer exhibited twice the coverage of metal ion and <italic> n</italic>-hexadecanethiol as the copper-based bilayer. This bilayer stoichiometry is of interest for applications requiring films possessing a minimal number of defects.

ISBN: 0493662057Subjects--Topical Terms:

586156
Chemistry, Analytical.

Electrochemical and spectroscopic studies of novel electroactive nanostructures.
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100 1 $a Baker, Wendy S. $3 1944553
245 1 0 $a Electrochemical and spectroscopic studies of novel electroactive nanostructures.
300 $a 172 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 1817.
500 $a Chair: Richard M. Crooks.
502 $a Thesis (Ph.D.)--Texas A&M University, 2002.
520 $a The first objective of this research was to examine the electrochemical behavior of arrays of nanometer-scale electrodes for agreement with existing microelectrode theory. The randomly-dispersed electrodes were prepared by cyanide etching of a Au(111) substrate passivated by a <italic>n</italic>-hexadecanethiol monolayer. The electrode arrays were characterized by scanning tunneling microscopy (STM) and electrochemistry to determine if the measured electrode geometries predict the observed electrochemical response. A second objective was to probe for size-selective molecular recognition behavior at the nanoscale electrodes. For this purpose, a series of viologen-functionalized poly(amidoamine) (PAMAM) dendrimers having hydrodynamic radii ranging from 2 to 4 nm were prepared and electrochemically and spectroscopically characterized. It was found that the electrochemical behavior of the viologenated dendrimers at the nanoelectrode arrays was complicated by adsorption effects. Alternate methods for performing the size-based molecular recognition studies which circumvent the adsorption problem are proposed. An additional investigation was performed to probe the structure of metal ion-coordinated bilayers on Au. In this study, a monolayer of 4-mercaptobenzoic acid on Au was linked to an upper-layer of <italic>n </italic>-hexadecanethiol via a Cu- or Ag-coordinating metal ion. The bilayers were studied by Fourier transform infrared-external reflectance spectroscopy (FTIR-ERS), ellipsometry, X-ray photoelectron spectroscopy (XPS), and time-of-flight secondary ion mass spectrometry (TOF-SIMS). This study demonstrated that the Ag-coordinated bilayer exhibited twice the coverage of metal ion and <italic> n</italic>-hexadecanethiol as the copper-based bilayer. This bilayer stoichiometry is of interest for applications requiring films possessing a minimal number of defects.
590 $a School code: 0803.
650 4 $a Chemistry, Analytical. $3 586156
650 4 $a Engineering, Chemical. $3 1018531
690 $a 0486
690 $a 0542
710 2 0 $a Texas A&M University. $3 718977
773 0 $t Dissertation Abstracts International $g 63-04B.
790 1 0 $a Crooks, Richard M., $e advisor
790 $a 0803
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3051582