Breakthrough in Nanotechnology: All-Optical Voltage Sensing with Nanodiamonds

Strategic Insights -

Researchers from the Royal Melbourne Institute of Technology - RMIT University have made a significant breakthrough in nanotechnology by developing an all-optical voltage sensing system using nanodiamonds. The innovative device enables the detection of electric fields on the nanoscale, paving the way for various applications in fields such as medicine, energy, and electronics.

Key Takeaways:

  • The researchers created fluorescent nanodiamonds (FNDs) with the nitrogen-vacancy (NV) center, a photoluminescent defect sensitive to the nanoscale environment.
  • The FNDs were integrated into a polymer-based capacitor device, which showed a transient increase in NV- PL intensity up to 31% within 0.1 ms after application of an external voltage.
  • The best electric field sensitivity for a single FND was 18 V cm-1 Hz-1/2, and the NV charge state photodynamics were investigated on the millisecond timescale.
  • The change in NV PL was found to strongly depend on the rate of photoexcitation, and a model was proposed to explain the results based on electric field-induced redistribution of photoexcited electrons.
  • The research concluded that these results contribute to the development of FNDs as reliable, all-optical, nanoscale electric field sensors in solid-state systems.
  • The study has been peer-reviewed and published in the journal Advanced Functional Materials.
  • The research was supported by the Australian Research Council, RMIT University, and the National Health & Medical Research Council (NHMRC) of Australia.

Statistics:

  • 95% of FNDs integrated into the capacitor device showed a transient increase in NV- PL intensity up to 31% within 0.1 ms after application of an external voltage.
  • The NV- PL signal increases with increasing electric field from 0 to 619 kV cm-1.
  • The best electric field sensitivity for a single FND is 18 V cm-1 Hz-1/2.

Sources:

  • All-optical Electric Field Sensing With Nanodiamond-doped Polymer Thin Films. Advanced Functional Materials, 2025.
  • NewsRx. New Findings Reported from Royal Melbourne Institute of Technology - RMIT University Describe Advances in Nanodiamonds (All-optical Electric Field Sensing With Nanodiamond-doped Polymer Thin Films). Nanotechnology Weekly, August 18, 2025.