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Differences in perchlorate adsorption to azobenzene monolayers on gold formed from thioacetate and thiol precursors

  • Beibei Pang , Danish Iqbal , Adnan Sarfraz , P. Ulrich Biedermann and Andreas Erbe EMAIL logo
Published/Copyright: July 4, 2022
Zeitschrift für Physikalische Chemie
From the journal Zeitschrift für Physikalische Chemie Volume 236 Issue 10

Abstract

Modification of metal surfaces with complex molecules opens interesting opportunities to build additional functionality into these surfaces. In this work, self assembled monolayers (SAMs) based on the same photoswitchable azobenzene motif but with different head groups have been synthesized and their SAMs on Au(111)/Si substrates have been characterized. 3-[(4-phenylazo)phenoxy]propyl thiol (PAPT) and its acetyl group protected analog, 3-[(4-phenylazo)phenoxy]propyl thioacetate (PAPA), have been synthesized. SAMs from PAPT and PAPA have been characterized by infrared (IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), ellipsometry and cyclic voltammetry (CV). The SAM-forming units of both SAMs are the same, as confirmed by IR and XPS, and the SAMs have similar surface coverage, as evidenced by analysis of the reductive desorption peaks in CVs. The tilt angle of the azobenzene moiety was ca. 75° with respect to the surface normal as determined by IR spectroscopy, i.e., the molecules are lying quite flat on the gold surface. Despite similar surface coverages, the CVs for PAPT in aqueous perchlorate solution show a typical perchlorate adsorption peak to gold, whereas the corresponding experiments with PAPA show no perchlorate adsorption at all. In conclusion, SAM formation can lead to an increase in the number of electrochemically accessible surface sites on the final, SAM covered surface. Whether the amount of such sites increases or decreases, depends on the precursor. The precursor most likely affects the adsorption mechanism and thus the atomic surface structure of the metal at the metal/SAM interface. Thus, details of the SAM formation mechanism, which is affected by the precursor used, can have quite strong effects on the electrochemical properties, and likely also electrocatalytic properties, of the resulting modified surface.

Keywords: azobenzene; electrochemical sensors; ion adsorption; photoisomerization; self-assembled monolayers
Corresponding author: Andreas Erbe, Department of Materials Science and Engineering, NTNU, Norwegian University of Science and Technology, 7491 Trondheim, Norway, E-mail:

Funding source: Deutsche Forschungsgemeinschaft

Acknowledgements

We cordially thank Asif Bashir for discussions of SAM alignment, Maciej Krzywiecki and Erlind Mysliu for assistance with XPS analysis and Petra Ebbinghaus for technical assistance.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: We acknowledge support from IMPRS Surmat and the Cluster of Excellence RESOLV (EXC 1069) funded by the Deutsche Forschungsgemeinschaft.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-10-17
Accepted: 2022-06-08
Published Online: 2022-07-04
Published in Print: 2022-10-26

© 2022 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Original Papers
  3. Combine merits of both sacrificial and impressed current cathodic protection in one system to mitigate chloride-induced corrosion in reinforcement concrete
  4. Differences in perchlorate adsorption to azobenzene monolayers on gold formed from thioacetate and thiol precursors
  5. Adsorption kinetics for the removal of toxic Congo red dye by polyaniline and citrus leaves as effective adsorbents
  6. Ionizing radiation based advanced oxidation process for reactive orange 122 dye degradation and kinetics studies
  7. Molecular interaction studies on the binding ability of hydrated zinc sulphate with aqueous solution of ascorbic acid at different temperatures
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  9. Review Article
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https://doi.org/10.1515/zpch-2021-3143
Keywords for this article
azobenzene; electrochemical sensors; ion adsorption; photoisomerization; self-assembled monolayers

Articles in the same Issue

  1. Frontmatter
  2. Original Papers
  3. Combine merits of both sacrificial and impressed current cathodic protection in one system to mitigate chloride-induced corrosion in reinforcement concrete
  4. Differences in perchlorate adsorption to azobenzene monolayers on gold formed from thioacetate and thiol precursors
  5. Adsorption kinetics for the removal of toxic Congo red dye by polyaniline and citrus leaves as effective adsorbents
  6. Ionizing radiation based advanced oxidation process for reactive orange 122 dye degradation and kinetics studies
  7. Molecular interaction studies on the binding ability of hydrated zinc sulphate with aqueous solution of ascorbic acid at different temperatures
  8. Theoretical investigation of some 1,2,4-triazole-based molecules synthetized
  9. Review Article
  10. Heterogeneous nanocatalyst for biodiesel fuel production: bench scale from waste oil sources
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