Functionalized Fluorescent Nanodiamonds with Millisecond Spin Relaxation Times.

ABSTRACT: Fluorescent nanodiamonds (FNDs) containing nitrogen-vacancy (NV) defects are useful probes for biological imaging and nanoscale sensing applications. Here, we explore the effect of chemical surface modifications and core-shell structures on the T₁ relaxation times of 100 nm FNDs hosting nitrogen-vacancy ensembles. The results show that surface oxidation and silica coating of FNDs using the Stöber method can dramatically increase the spin relaxation time from T₁ = 320 ± 9 μs to T₁ = 1.00 ± 0.06 ms. Using FT-IR and NEXAFS measurements conducted on air oxidized particles, we find that changes to surface functional groups and sp² carbon density may be responsible for the observed enhancements to the spin rela

SUBMITTER: Barzegaramiriolya M 

PROVIDER: S-EPMC12574219 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature