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Title: Characterization and reactivity of organic monolayers on gold and platinum surfaces

Abstract

Purpose is to understand how the mobilization, dielectric, orientation, composition, coverage, and structure of self-assembled organic monolayers on metal surfaces affects the surface reactivities and properties of these films in order to facilitate the construction of desired films. Two model systems were used: tiols at Au and aromatic acids at Pt. Surface analysis methods, including contact angle, electrochemistry, ellipsometry, infrared reflection absorption spectroscopy (IRRAS), and x-ray photospectroscopy, were used to study the self-assembled organic monolayers on Au and Pt. IRRAS, contact angle, and electrochemistry were used to determine the surface pKa of phenylcarboxylic acids and pyridylcarboxylic acids monolayers on Pt. These techniques were also used to determine the orientation of polymethylene chain axis and the carboxylic follow the structural evolution of the chains and end group of the thiolate monolayers during formation. IRRAS was also used to assess the carboxylic acid group in terms of its possible existence as the non-hydrogen-bonded species, the hydrogen-bonded dimeric group, and the hydrogen-bonded polymeric group. These different forms of the end group were also followed vs coverage, as well as the reactivity vs solution pH. IRRAS and contact angle were used to calculate the rate constant of the esterification of carboxylic acid-terminated monolayers onmore » Au.« less

Authors:
 [1]
  1. Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
249072
Report Number(s):
IS-T-1671
ON: DE96012080
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: TH: Thesis (Ph.D.); PBD: 6 Dec 1995
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; GOLD; SURFACE PROPERTIES; PLATINUM; THIN FILMS; ADSORPTION; LAYERS; THIOLS; CARBOXYLIC ACIDS; AROMATICS

Citation Formats

Wu, Chien-Ching. Characterization and reactivity of organic monolayers on gold and platinum surfaces. United States: N. p., 1995. Web. doi:10.2172/249072.
Wu, Chien-Ching. Characterization and reactivity of organic monolayers on gold and platinum surfaces. United States. https://doi.org/10.2172/249072
Wu, Chien-Ching. 1995. "Characterization and reactivity of organic monolayers on gold and platinum surfaces". United States. https://doi.org/10.2172/249072. https://www.osti.gov/servlets/purl/249072.
@article{osti_249072,
title = {Characterization and reactivity of organic monolayers on gold and platinum surfaces},
author = {Wu, Chien-Ching},
abstractNote = {Purpose is to understand how the mobilization, dielectric, orientation, composition, coverage, and structure of self-assembled organic monolayers on metal surfaces affects the surface reactivities and properties of these films in order to facilitate the construction of desired films. Two model systems were used: tiols at Au and aromatic acids at Pt. Surface analysis methods, including contact angle, electrochemistry, ellipsometry, infrared reflection absorption spectroscopy (IRRAS), and x-ray photospectroscopy, were used to study the self-assembled organic monolayers on Au and Pt. IRRAS, contact angle, and electrochemistry were used to determine the surface pKa of phenylcarboxylic acids and pyridylcarboxylic acids monolayers on Pt. These techniques were also used to determine the orientation of polymethylene chain axis and the carboxylic follow the structural evolution of the chains and end group of the thiolate monolayers during formation. IRRAS was also used to assess the carboxylic acid group in terms of its possible existence as the non-hydrogen-bonded species, the hydrogen-bonded dimeric group, and the hydrogen-bonded polymeric group. These different forms of the end group were also followed vs coverage, as well as the reactivity vs solution pH. IRRAS and contact angle were used to calculate the rate constant of the esterification of carboxylic acid-terminated monolayers on Au.},
doi = {10.2172/249072},
url = {https://www.osti.gov/biblio/249072}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 06 00:00:00 EST 1995},
month = {Wed Dec 06 00:00:00 EST 1995}
}

Thesis/Dissertation:
Other availability
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