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Effect of alkanethiol self-assembled monolayers on the plastic and elastic deformation of gold (111) films

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TypeOfResource
Text
TitleInfo (ID = T-1)
Title
Effect of alkanethiol self-assembled monolayers on the plastic and elastic deformation of gold (111) films
Identifier
ETD_2447
Identifier (type = hdl)
http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000052974
Language
LanguageTerm (authority = ISO639-2); (type = code)
eng
Genre (authority = marcgt)
theses
Subject (ID = SBJ-1); (authority = RUETD)
Topic
Materials Science and Engineering
Subject (ID = SBJ-2); (authority = ETD-LCSH)
Topic
Plastics--Corrosion
Subject (ID = SBJ-3); (authority = ETD-LCSH)
Topic
Surfaces, Deformation of
Subject (ID = SBJ-4); (authority = ETD-LCSH)
Topic
Gold films
Subject (ID = SBJ-5); (authority = ETD-LCSH)
Topic
Mechanical chemistry
Abstract (type = abstract)
Surface chemistry is known to affect the elastic deformation of nanocontacts, but its role in plastic deformation is less clear. Alkanethiol self-assembled monolayers (SAMs) were used to modify the surface energy and surface stress of Au(111) films. The chemical effect of this nanometer scale film on elastic and plastic deformation was investigated using nanoindentation combined with atomic force microscopy (AFM) imaging of indents. A range of maximum indentation displacements and SAM chain lengths were used. Comparisons were made between the mechanical response of the gold substrate alone and the gold modified with the different SAMs. The nanoindentation load-displacement curves and the mechanical properties were found to be dependent on the presence of the SAM. A decrease in the reduced elastic modulus was observed when indenting the SAM systems. The work of indentation and the hardness showed a similar effect with the SAM layer lowering hardness in both cases. Remarkably, the SAM was found to affect hardness, and hence plasticity, at indentation depths over 100 times the SAM thickness. Comparisons were made between the projected contact areas approximated using the Oliver and Pharr method with the actual areas directly measured by AFM analysis. This accounts for underestimation of the contact area due to pileup of gold around the indent. AFM characterization of the residual nanoindentation impressions showed substantial differences between the indent shape and pileup when comparing the gold to the gold plus SAM surfaces. The differences are more pronounced for the longer chain length SAM and as the indents become deeper. The SAM reduces the adhesion force between the indenter tip and surface which may affect the observed mechanical properties for shallow indents. For the deeper indentations the exothermic reaction of the alkanethiol molecules chemisorbed on the gold surface reduces the surface free energy of the gold substrate which favors the creation of new surface (pileup). In addition, surface stress which is compressive when a SAM is present, but tensile otherwise, appears to modify the behavior of dislocations and strain hardening in the Au films. This is the most likely cause of the dramatic change in hardness and pileup.
PhysicalDescription
Form (authority = gmd)
electronic resource
Extent
xvii, 192 p. : ill.
InternetMediaType
application/pdf
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text/xml
Note (type = degree)
Ph.D.
Note
Includes abstract
Note
Vita
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Milca I. Aponte
Name (ID = NAME-1); (type = personal)
NamePart (type = family)
Aponte
NamePart (type = given)
Milca I.
NamePart (type = date)
1981-
Role
RoleTerm (authority = RULIB)
author
DisplayForm
Milca Aponte
Name (ID = NAME-2); (type = personal)
NamePart (type = family)
Mann
NamePart (type = given)
Adrian B
Role
RoleTerm (authority = RULIB)
chair
Affiliation
Advisory Committee
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Adrian B Mann
Name (ID = NAME-3); (type = personal)
NamePart (type = family)
Cosandey
NamePart (type = given)
Frederic
Role
RoleTerm (authority = RULIB)
internal member
Affiliation
Advisory Committee
DisplayForm
Frederic Cosandey
Name (ID = NAME-4); (type = personal)
NamePart (type = family)
Tsakalakos
NamePart (type = given)
Thomas
Role
RoleTerm (authority = RULIB)
internal member
Affiliation
Advisory Committee
DisplayForm
Thomas Tsakalakos
Name (ID = NAME-5); (type = personal)
NamePart (type = family)
Birnie
NamePart (type = given)
Dunbar P
Role
RoleTerm (authority = RULIB)
internal member
Affiliation
Advisory Committee
DisplayForm
Dunbar P Birnie
Name (ID = NAME-6); (type = personal)
NamePart (type = family)
Asefa
NamePart (type = given)
Tewodros
Role
RoleTerm (authority = RULIB)
outside member
Affiliation
Advisory Committee
DisplayForm
Tewodros Asefa
Name (ID = NAME-1); (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (ID = NAME-2); (type = corporate)
NamePart
Graduate School - New Brunswick
Role
RoleTerm (authority = RULIB)
school
OriginInfo
DateCreated (qualifier = exact)
2010
DateOther (qualifier = exact); (type = degree)
2010
Place
PlaceTerm (type = code)
xx
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
PhysicalLocation (authority = marcorg); (displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Identifier (type = doi)
doi:10.7282/T3M32VV1
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

RightsDeclaration (AUTHORITY = GS); (ID = rulibRdec0006)
The author owns the copyright to this work.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
RightsHolder (ID = PRH-1); (type = personal)
Name
FamilyName
Aponte
GivenName
Milca
Role
Copyright Holder
RightsEvent (ID = RE-1); (AUTHORITY = rulib)
Type
Permission or license
DateTime
2010-01-27 15:30:40
AssociatedEntity (ID = AE-1); (AUTHORITY = rulib)
Role
Copyright holder
Name
Milca Aponte
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject (ID = AO-1); (AUTHORITY = rulib)
Type
License
Name
Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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Technical

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ETD
MimeType (TYPE = file)
application/pdf
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application/x-tar
FileSize (UNIT = bytes)
4177920
Checksum (METHOD = SHA1)
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