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Magnesium film-over-nanospheres (FONs) for surface-enhanced Raman scattering.

Andrey Ten1,2, Vladimir Lomonosov1,2, Zeki Semih Pehlivan1,2

  • 1Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK. er407@cam.ac.uk.

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Summary
This summary is machine-generated.

Magnesium oxide surfaces bind molecules best when they dissociate, with a pKa between 4.5 and 7.5. This finding advances understanding of magnesium

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Spectroscopy

Background:

  • Magnesium (Mg) interfacial interactions are crucial for catalysis and biomedicine.
  • Plasmonic Mg research enables sensitive molecular detection via surface-enhanced Raman scattering (SERS).

Purpose of the Study:

  • To investigate molecular binding on native Mg oxide surfaces using novel Mg film-over-nanospheres (FONs) as SERS substrates.
  • To expand the understanding of molecular adsorption on Mg surfaces beyond previously studied molecules.

Main Methods:

  • Fabrication of novel Mg film-over-nanospheres (FONs).
  • Utilizing FONs as SERS substrates for molecular binding studies.
  • Systematic investigation of 17 molecules with diverse functional groups.

Main Results:

  • Identified binding of 4-nitrophenol (4-NP) and 5,5'-dithiobis (2-nitrobenzoic acid) (DTNB) on Mg surfaces.
  • Discovered a pKa-dependent binding trend: adsorbates require dissociation and a pKa between ~4.5 and 7.5 for binding.
  • Observed that diselenides and ditellurides deviate from this pKa trend.

Conclusions:

  • The pKa of an adsorbate dictates its binding behavior on natively oxidized Mg surfaces.
  • This research provides a foundation for chemically functionalizing Mg surfaces for plasmonic and other applications.