Thermal reactions of mercaptoethanol on Cu(100)

Shih, Jain Jung; Liao, Yung Hsuan; Kuo, Kuan Hung; Lin, Jinru

doi:10.1016/j.susc.2004.11.017

Cited by 2 publications

(2 citation statements)

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“…66 Shih and co-workers used TPD and IR spectroscopy to study the thermal reactions of mercaptoethanol on clean and oxygenprecovered Cu(100) and concluded that C-S bond scission began at ∼42 °C. 67 The C-S bond in n-decanethiol adsorbed on copper was observed to have low thermal stability, cleaving at ∼100 °C. 68 For alkanethiol monolayers on gold and in contact with hexadecane, ellipsometry results demonstrated that longer alkyl chains lead to greater thermal stability, but desorption still occurred at quite low temperatures (>70 °C).…”

Section: Resultsmentioning

confidence: 99%

“…These same techniques were used to probe the thermal reactions of alkanethiols on GaAs(100) and showed that the most stable thiolate adsorbate on an As site undergoes carbon−sulfur bond cleavage at 247 °C independent of alkyl chain length . Shih and co-workers used TPD and IR spectroscopy to study the thermal reactions of mercaptoethanol on clean and oxygen-precovered Cu(100) and concluded that C−S bond scission began at ∼42 °C . The C−S bond in n -decanethiol adsorbed on copper was observed to have low thermal stability, cleaving at ∼100 °C .…”

Section: Resultsmentioning

confidence: 99%

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Molecular Anchors for Self-Assembled Monolayers on ZnO: A Direct Comparison of the Thiol and Phosphonic Acid Moieties

Perkins

2009

J. Phys. Chem. C

108

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Two of the most promising schemes for attaching organic molecules to metal oxides are based on the chemistry of the thiol and phosphonic acid moieties. We have made a direct comparison of the efficacy of these two molecular anchors on zinc oxide by comparing the chemical and physical properties of n-hexane derivatives of both. The surface properties of polycrystalline ZnO thin films and ZnO(0001 j )-O crystals modified with 1-hexanethiol and 1-hexanephosphonic acid were examined with a novel quartz crystal microbalance (QCM)-based flow cell reactor, angle-resolved and temperature-dependent photoelectron spectroscopy, and contact angle measurements. A means of using ammonium chloride as a probe of molecule-ZnO interactions is introduced and used to ascertain the relative quality of self-assembled monolayers (SAMs) based on thiols and phosphonic acids. QCM data shows that a phosphonic acid-anchored alkyl chain only six carbons long can provide significant corrosion protection for ZnO against Brønsted acids, reducing the etch rate relative to the bare ZnO surface by a factor of more than nine. In contrast, we find that monolayers from the analogous molecule hexanethiol are more defective as revealed by their higher ionic permeability and lower hydrophobicity. Substrate attenuation X-ray photoelectron spectroscopy (XPS) experiments were used to determine the thickness of SAMs formed by the two hexane derivatives and it was found that SAMs from phosphonic acids were approximately twice as thick as those formed by hexanethiol. The thermal stability of the two linking groups was also explored and we find that previous claims of highly stable alkanethiolate monolayers on ZnO are suspect. Taken as a whole, our results indicate that the phosphonic acid moiety is preferred over thiols for the attachment of short alkyl groups to ZnO.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%