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Sensing of a few unpaired electron spins, such as metal ions and radicals, isa useful but difficult task in nanoscale physics, biology, and chemistry.Single nitrogen-vacancy (NV) centers in diamond offer high sensitivity andspatial resolution in the optical detection of weak magnetic fields produced bya spin bath, but often require long acquisition times, of the order of seconds.Here we use a novel approach, based on coupled spin and charge dynamics indense NV ensembles in strongly fluorescent nanodiamonds (NDs) to sense externalmagnetic dipoles. We apply this approach to various paramagnetic species,including gadolinium complexes, magnetite nanoparticles and hemoglobin in wholeblood. Taking advantage of the high NV density, we demonstrate detection ofsubnanomolar amounts of Gd spins with ultrashort acquisition time approaching10 ms. Strong luminescence, high sensitivity and short acquisition time makedense NV- ensembles in NDs a powerful tool for biosensing and bioimagingapplications.

Fast and sensitive detection of hemoglobin and other paramagnetic  species using coupled charge and spin dynamics in strongly fluorescent  nanodiamonds