XPS Imaging of Patterned Self-assembled Monolayers Containing Perfluorinated Alkyl Chains

Evans, Stephen D.; Flynn, T. M.; Ulman, Abraham; Beamson, G.

doi:10.1002/(sici)1096-9918(199603)24:3<187::aid-sia102>3.0.co;2-k

Cited by 15 publications

(7 citation statements)

References 19 publications

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“…The XPS spectra of these samples also showed a larger F/Au ratio than expected, and it is thought that this is explained by the presence of physisorbed anhydride and its decomposition products (i.e., carboxylic acids) on the surface. The contact angle for the saturated HFBA surface of 119° is in excellent agreement with the value of 118° obtained for SAMs composed of perfluorinated molecules, HS−(CH 2 ) 2 −(CF 2 ) 5 −CF 3 (Bain et al ) and HS−(CH 2 ) 4 −O−(C 6 H 4 )−S−(CH 2 )−(CF 2 ) 10 −CF 3 (Evans et al ) indicating that the derivatized surfaces have comparable order to SAMs prepared directly from fluorinated molecules. The lower values for the shorter chain anhydrides would indicate either greater disorder in these layers or greater “sensing” of the polar ester group just below the surface …”

Section: Resultssupporting

confidence: 84%

Functionalization of Hydroxyl and Carboxylic Acid Terminated Self-Assembled Monolayers

and

Leggett

1997

Langmuir

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The functionalization of monolayers of mercaptopropanol (MPL) and mercaptopropanoic acid (MPA) adsorbed onto surfaces of gold has been studied using X-ray photoelectron spectroscopy and contact angle goniometry. The terminal hydroxyl goups of the MPL monolayers were derivatized with the vapor from either trifluoroacetic anhydride, pentafluoropropanoic anhydride, or heptafluorobutyric anhydride to yield highly hydrophobic, CF 3 functionalized surfaces. For the MPA monolayers the carboxylic acid groups at the surface were derivatized by reaction with the vapor from trifluoroethanol, pyridine, and di-tertbutylcarbodiimide. This resulted in only ∼60% of the surface carboxyl groups undergoing reaction in contrast to the 100% derivatization of poly(acrylic acid), indicating a difference in reactivity of these two materials.

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Section: Resultssupporting

confidence: 84%

Functionalization of Hydroxyl and Carboxylic Acid Terminated Self-Assembled Monolayers

and

Leggett

1997

Langmuir

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“…The Y-axis of the image corresponds to binding energy, the X-axis defines position on the sample and the colour intensity scale corresponds to electron counts. 24,25 Both of the XPS images, shown as Fig. 4a and b, exhibit prominent vertical line features.…”

Section: Xps Imagingmentioning

confidence: 99%

Electropolishing of stainless steels in a choline chloride based ionic liquid: an electrochemical study with surface characterisation using SEM and atomic force microscopy

Abbott

Capper

McKenzie

et al. 2006

Phys. Chem. Chem. Phys.

185

114

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We have studied the anodic dissolution (electropolishing) of various stainless steel alloys in an ionic liquid comprising a 2 : 1 stoichiometric mix of ethylene glycol (EG) and choline chloride. We have used a combination of electrochemical and spectroscopic methods together with in situ liquid probe microscopy. We discuss the role and influence of the surface oxide passivation layer, characterized here by X-ray photoelectron spectroscopy (XPS) and linear sweep voltammetry, on the polishing process. We address the question of dealloying during the polish in order to contribute to our understanding of the viability of the ionic liquid as a replacement industrial electropolishing medium; the current commercial process uses a corrosive mixture of phosphoric and sulfuric acids. Also, we present data from ex situ and in situ liquid AFM studies giving both a qualitative and quantitative insight into the nature and scale of morphological changes at the steel surface during the polishing process.

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“…Fluoropolymers, such as poly(tetrafluoroethylene) (PTFE), and SAM-forming molecules, such as perfluorinated thiols, silanes, and n -alkanoic acids, are widely used for surface fluorination in academia and industry (e.g., as easy-to-clean surfaces). − The modification of surfaces with PTFE is chemically challenging because of its low reactivity and solubility. Thiols, on the other hand, generally form stable layers on (noble) metals only and are thus not applicable to the functionalization of most materials.…”

Section: Introductionmentioning

confidence: 99%

Fabricating Chemical Gradients on Oxide Surfaces by Means of Fluorinated, Catechol-Based, Self-Assembled Monolayers

et al. 2010

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Catechols bind strongly to several metal oxides and can thus be used as a binding group for generating self-assembled monolayers. Furthermore, their derivatives can be used to produce well-defined, centimeter-scale surface-chemical gradients on technologically relevant surfaces, such as titanium dioxide (TiO(2)). A simple dip-and-rinse gradient-preparation technique was utilized to produce surface-hydrophobicity gradients from perfluoro-alkyl catechols and nitrodopamine (ND). Chemical composition, quality, and properties of the functionalized surfaces were determined by means of X-ray photoelectron spectroscopy (XPS), variable-angle spectroscopic ellipsometry (VASE), and static water contact angle (sCA) measurements. Contact angles were found to be in the range of 30°-95°, correlating well with the determined surface chemical composition and adlayer thickness.

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XPS Imaging of Patterned Self-assembled Monolayers Containing Perfluorinated Alkyl Chains

Cited by 15 publications

References 19 publications

Functionalization of Hydroxyl and Carboxylic Acid Terminated Self-Assembled Monolayers

Functionalization of Hydroxyl and Carboxylic Acid Terminated Self-Assembled Monolayers

Electropolishing of stainless steels in a choline chloride based ionic liquid: an electrochemical study with surface characterisation using SEM and atomic force microscopy

Fabricating Chemical Gradients on Oxide Surfaces by Means of Fluorinated, Catechol-Based, Self-Assembled Monolayers

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