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Title: Enhancing the Properties of Carbon and Gold Substrates by Surface Modification

Abstract

The properties of both carbon and gold substrates are easily affected by the judicious choice of a surface modification protocol. Several such processes for altering surface composition have been published in literature. The research presented in this thesis primarily focuses on the development of on-column methods to modify carbon stationary phases used in electrochemically modulated liquid chromatography (EMLC). To this end, both porous graphitic carbon (PGC) and glassy carbon (GC) particles have been modified on-column by the electroreduction of arenediazonium salts and the oxidation of arylacetate anions (the Kolbe reaction). Once modified, the carbon stationary phases show enhanced chromatographic performance both in conventional liquid chromatographic columns and EMLC columns. Additionally, one may also exploit the creation of aryl films to by electroreduction of arenediazonium salts in the creation of nanostructured materials. The formation of mercaptobenzene film on the surface of a GC electrode provides a linking platform for the chemisorption of gold nanoparticles. After deposition of nanoparticles, the surface chemistry of the gold can be further altered by self-assembled monolayer (SAM) formation via the chemisorption of a second thiol species. Finally, the properties of gold films can be altered such that they display carbon-like behavior through the formation of benzenehexathiolmore » (BHT) SAMs. BHT chemisorbs to the gold surface in a previously unprecedented planar fashion. Carbon and gold substrates can be chemically altered by several methodologies resulting in new surface properties. The development of modification protocols and their application in the analytical arena is considered herein.« less

Authors:
 [1]
  1. Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
803828
Report Number(s):
IS-T 2191
TRN: US200301%%530
DOE Contract Number:  
W-7405-Eng-82
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: TH: Thesis (Ph.D.); Submitted to Iowa State Univ., Ames, IA (US); PBD: 27 Jun 2002
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANIONS; CARBON; CHEMISORPTION; CHEMISTRY; CHROMATOGRAPHY; DEPOSITION; ELECTRODES; EXTRACTION COLUMNS; GOLD; MODIFICATIONS; OXIDATION; SUBSTRATES; SURFACE PROPERTIES; THIOLS

Citation Formats

Harnisch, Jennifer Anne. Enhancing the Properties of Carbon and Gold Substrates by Surface Modification. United States: N. p., 2001. Web. doi:10.2172/803828.
Harnisch, Jennifer Anne. Enhancing the Properties of Carbon and Gold Substrates by Surface Modification. United States. https://doi.org/10.2172/803828
Harnisch, Jennifer Anne. Mon . "Enhancing the Properties of Carbon and Gold Substrates by Surface Modification". United States. https://doi.org/10.2172/803828. https://www.osti.gov/servlets/purl/803828.
@article{osti_803828,
title = {Enhancing the Properties of Carbon and Gold Substrates by Surface Modification},
author = {Harnisch, Jennifer Anne},
abstractNote = {The properties of both carbon and gold substrates are easily affected by the judicious choice of a surface modification protocol. Several such processes for altering surface composition have been published in literature. The research presented in this thesis primarily focuses on the development of on-column methods to modify carbon stationary phases used in electrochemically modulated liquid chromatography (EMLC). To this end, both porous graphitic carbon (PGC) and glassy carbon (GC) particles have been modified on-column by the electroreduction of arenediazonium salts and the oxidation of arylacetate anions (the Kolbe reaction). Once modified, the carbon stationary phases show enhanced chromatographic performance both in conventional liquid chromatographic columns and EMLC columns. Additionally, one may also exploit the creation of aryl films to by electroreduction of arenediazonium salts in the creation of nanostructured materials. The formation of mercaptobenzene film on the surface of a GC electrode provides a linking platform for the chemisorption of gold nanoparticles. After deposition of nanoparticles, the surface chemistry of the gold can be further altered by self-assembled monolayer (SAM) formation via the chemisorption of a second thiol species. Finally, the properties of gold films can be altered such that they display carbon-like behavior through the formation of benzenehexathiol (BHT) SAMs. BHT chemisorbs to the gold surface in a previously unprecedented planar fashion. Carbon and gold substrates can be chemically altered by several methodologies resulting in new surface properties. The development of modification protocols and their application in the analytical arena is considered herein.},
doi = {10.2172/803828},
url = {https://www.osti.gov/biblio/803828}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}

Thesis/Dissertation:
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