Fast and Sensitive Detection of Paramagnetic Species Using Coupled Charge and Spin Dynamics in Strongly Fluorescent Nanodiamonds

• DOI: 10.1021/acsami.9b05779
• Publication Date: 2019-06-14T20:15:55Z
• Authors: F. Gorrini; R. Giri; C. E. Avalos; S. Tambalo; S. Mannucci; L. Basso; N. Bazzanella; C. Dorigoni; M. Cazzanelli; P. Marzola; A. Miotello; A. Bifone
• Keywords: Dynamics

Sensing of a few unpaired electron spins, such as in metal ions and radicals, is useful but difficult task nanoscale physics, biology, chemistry. Single negatively charged nitrogen-vacancy (NV-) centers diamond offer high sensitivity spatial resolution the optical detection weak magnetic fields produced by spin bath often require long acquisition times on order seconds. Here, we present an approach based coupled charge dynamics dense NV ensembles strongly fluorescent nanodiamonds (NDs) to sense external dipoles. We apply this various paramagnetic species, including gadolinium complexes, magnetite nanoparticles, hemoglobin whole blood. Taking advantage density, demonstrate dramatic reduction time (down tens milliseconds) while maintaining centers. Strong luminescence, sensitivity, short make NV- NDs potentially promising tool for biosensing bioimaging applications.