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Quantifying thiol–gold interactions towards the efficient strength control

Author

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  • Yurui Xue

    (State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University)

  • Xun Li

    (State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University)

  • Hongbin Li

    (University of British Columbia)

  • Wenke Zhang

    (State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University)

Abstract

The strength of the thiol–gold interactions provides the basis to fabricate robust self-assembled monolayers for diverse applications. Investigation on the stability of thiol–gold interactions has thus become a hot topic. Here we use atomic force microscopy to quantify the stability of individual thiol–gold contacts formed both by isolated single thiols and in self-assembled monolayers on gold surface. Our results show that the oxidized gold surface can enhance greatly the stability of gold–thiol contacts. In addition, the shift of binding modes from a coordinate bond to a covalent bond with the change in environmental pH and interaction time has been observed experimentally. Furthermore, isolated thiol–gold contact is found to be more stable than that in self-assembled monolayers. Our findings revealed mechanisms to control the strength of thiol–gold contacts and will help guide the design of thiol–gold contacts for a variety of practical applications.

Suggested Citation

  • Yurui Xue & Xun Li & Hongbin Li & Wenke Zhang, 2014. "Quantifying thiol–gold interactions towards the efficient strength control," Nature Communications, Nature, vol. 5(1), pages 1-9, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5348
    DOI: 10.1038/ncomms5348
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