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Coatings that respond to the changes in the environment can broaden the range of applications for relaxometry measurements. Coatings that change their charge in a specific pH range (e.g., poly(l-cysteine) with pKa = 8–10) will make the NV centers in the diamond sensitive to that range of pH changes. Gadolinium-labeled coatings that detach or expand upon stimulus bring the paramagnetic label closer to or further away from the diamond surface, directly affecting T1 values.
