Electrostatic control of NV charge states for quantitative pH sensing at diamond–electrolyte interfaces

ORAL

Abstract

Nanoscale pH sensing is important for studying local biochemical and electrochemical processes, but conventional fluorescent indicators can be nonreusable and unstable under harsh conditions. Nitrogen-vacancy (NV) centers in diamond provide a robust sensing platform scalable from nanodiamonds to bulk crystals. We present a pH readout approach for electrolyte solutions in contact with diamond based on the NV-/NV0 fluorescence ratio. By applying and scanning an external voltage, we electrostatically tune the NV charge-state response and support pH discrimination over an extended operating range. The results support voltage-assisted, diamond-based pH sensing for applications in electrochemistry and environmental monitoring.

*This work was supported by JST K Program Grant Number JPMJKP24F3.

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Presenters

  • Saki Tsuchiya

    • Institute of Science Tokyo

Authors

  • Saki Tsuchiya

    • Institute of Science Tokyo

  • Oshimi Keisuke

    • Institute of Science Tokyo

  • Eikichi Kimura

    • Institute of Science Tokyo

  • Handoko Setiawan

    • Institute of Science Tokyo

  • Sherjeel Baig

    • Institute of Science Tokyo

  • Kristi Saikia

    • Okayama University

  • Sara Mandić

    • Okayama University

  • Ashutosh Rathi

    • Okayama Univerisity

  • Masazumi Fujiwara

    • Okayama University

  • Keigo Arai

    • Institute of Science Tokyo