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Spontaneously Adsorbed Monolayer Filins: Fabrication, Characterization, and Application of Monolayers of Alkanethiol and Sulfur-bearing Cyclodestrin Derivatives [Thesis]

Technical Report ·
DOI:https://doi.org/10.2172/6010993· OSTI ID:6010993
 [1]
  1. Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
+ Show Author Affiliations

Monolayers of n-alkanethiols (CH3(CH2)nSH, n=1--17) and sulfur-bearing cyclodextrin derivatives spontaneously adsorbed on Ag and Au have been studied with a variety of surface characterization methods, such as infrared inflection spectroscopy, contact angle measurements, electro-chemistry, optical ellipsometry, and scanning tunneling microscopy. Long chain n-alkanethiols monolayers on Ag and Au are insulating to electron transfer and have contact angles indicative of well-ordered hydrocarbon terminated structures. Infrared and contact angle data indicate a different orientation of the methyl group with respect to the surface for chains with odd and even numbers of methylene groups. Compared to monolayers on Au, the alkanethiol monolayers on Ag are oriented more towards the surface normal. The observed odd-even effect methyl group orientation for these monolayers on Ag is offset by a methylene group from that on Au. The relationships between the structure and packing of the monolayers on Ag and Au and the composition, roughness, and crystallinity of the substrate are also discussed. Monolayers of sulfur-bearing cyclodextrin derivatives on Au and Ag are fabricated by spontaneous adsorption and characterized by the above techniques. Size-selectively and molecular recognition of the $$\alpha$$- and $$\beta$$-cyclodextrin cavity are shown with our monolayers. Because of molecular recognition, p-nitrophenol is retained preferentially by the cyclodextrin monolayers over o-nitrophenol.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
W-7405-ENG-82
OSTI ID:
6010993
Report Number(s):
IS-T--1532; ON: DE91009866
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ANNULAR SPACE
AROMATICS
CARBOHYDRATES
CLOSED CONFIGURATIONS
CONFIGURATION
DEXTRIN
ELEMENTS
ELLIPSOMETRY
FILMS
GOLD
HYDROXY COMPOUNDS
INFRARED SPECTRA
INTERFACES
LAYERS
MAGNETIC FIELD CONFIGURATIONS
MEASURING METHODS
METALS
NITRO COMPOUNDS
NITROPHENOL
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHENOLS
PHYSICAL PROPERTIES
POLYSACCHARIDES
SACCHARIDES
SILVER
SORPTION
SORPTIVE PROPERTIES
SPACE
SPECTRA
SPECTRAL REFLECTANCE
SURFACE PROPERTIES
THIN FILMS
THIOLS
TOROIDAL CONFIGURATION
TRANSITION ELEMENTS
VOLTAMETRY