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Diamond surface functionalization via visible light-driven C-H activation for nanoscale quantum sensing.

Lila V H Rodgers1, Suong T Nguyen2, James H Cox2

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Researchers developed a new method to attach molecules to diamond surfaces using visible light. This breakthrough enables nanoscale NMR sensing and single-molecule spectroscopy with nitrogen-vacancy centers.

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Area of Science:

  • Quantum sensing
  • Materials science
  • Nanotechnology

Background:

  • Nitrogen-vacancy (NV) centers in diamond are key for nanoscale NMR sensing.
  • Current methods for functionalizing diamond surfaces are harsh and limit molecular diversity.
  • Attaching molecules to diamond for single-molecule spectroscopy remains a challenge.

Purpose of the Study:

  • To develop a versatile and gentle method for functionalizing single-crystal diamond surfaces.
  • To enable NV-center-based sensing and spectroscopy of individual molecules.
  • To overcome limitations of existing diamond surface modification techniques.

Main Methods:

  • Direct functionalization of C-H bonds on single-crystal diamond using visible light.
  • Formation of C-F, C-Cl, C-S, and C-N bonds under ambient conditions.
  • Utilizing shallow NV centers with long spin coherence times.

Main Results:

  • A versatile strategy for direct diamond surface functionalization was established.
  • The method is compatible with shallow NV centers, preserving long spin coherence.
  • Demonstrated NV-center detection of nuclear spins from surface-bound functional groups.

Conclusions:

  • The developed method allows for diverse surface functionalization of diamond under mild conditions.
  • This approach facilitates the use of NV centers for advanced chemical sensing.
  • Opens new avenues for single-molecule spectroscopy using diamond-based quantum sensors.