All-optical nanoscale thermometry based on silicon-vacancy centers in detonation nanodiamonds

Silicon-vacancy (SiV) centers in diamond are a promising candidate for all-optical nanoscale high-sensitivity thermometry because they have sufficient sensitivity to reach the subkelvin precision required application biosystems. It is expected that nanodiamonds with SiV can be injected into cells measure local temperatures of biosystems such as organelles. However, smallest particle size used demonstrate using few hundred nanometers. We recently developed SiV-center-containing via detonation process suitable large-scale production. Here, we investigate spectral response (SiV-DNDs) temperature. air-oxidized and polyglycerol-coated SiV-DNDs mean around 20 nm, which color nanodiamond. found zero-phonon line SiV-DND linearly red-shifted increasing temperature range 22.0–40.5 °C. The peak was 0.011 ± 0.002 nm/K, agrees reported high bulk diamond. A analysis revealed achieve precision. All-optical will important investigating nanosystems organelles living cells.