Optically-trapped-nanodiamond relaxometric detection of nanomolar paramagnetic spins in aqueous environments
Nanoscale sensing of electromagnetic signals in aqueous environments is crucial for applications ranging from advanced materials research to biological systems. Employing optically trapped fluorescent nanodiamonds (FNDs) containing nitrogen-vacancy centers, the authors perform spin-relaxometry measurements in solution, demonstrating nanomolar-level sensitivity to the paramagnetic ion Gd${}^{3+}$. They also develop a theoretical framework that successfully captures all three of the distinct phases observed in the data. Their work highlights the potential of optically trapped FNDs to advance nanoscale sensing of free paramagnetic ions and molecules in biologically relevant environments.
Authors
- Chong Zu (ORCID: https://orcid.org/0000-0001-7803-1315)
- Erik Henriksen (ORCID: https://orcid.org/0000-0002-4978-2440)
- Shankar Mukherji
- P. Wang
- Changyu Yao (ORCID: https://orcid.org/0000-0002-0140-2701)
- Kater Murch (ORCID: https://orcid.org/0000-0002-1536-294X)
- Michael Allen Mohs (ORCID: https://orcid.org/0009-0009-0336-7514)
- Md Shakil Bin Kashem
- Olivia Lazorik (ORCID: https://orcid.org/0009-0007-2474-6033)
- Shiva Iyer
- Gianna Glenn
- Yinyao Shi (ORCID: https://orcid.org/0009-0004-3517-5561)
- Michael Mansour (ORCID: https://orcid.org/0009-0001-5225-8500)
Institutions
- Washington University in St. Louis (US)
Publication Details
- Journal
- Physical Review Applied
- Published
- 2024-12-19
- DOI
- https://doi.org/10.1103/physrevapplied.22.064076
- Citations
- 7
- Primary Topic
- Diamond and Carbon-based Materials Research
- Type
- article
- Field-Weighted Citation Impact
- 0.82
Funders
- Gordon and Betty Moore Foundation
- Washington University in St. Louis