Photoluminescence from NV - Centres in 5 nm Detonation Nanodiamonds: Identification and High Sensitivity to Magnetic Field.

Autor: Osipov VY; Ioffe Institute, Polytechnicheskaya 26, St. Petersburg, 194021, Russia. osipov@mail.ioffe.ru., Treussart F; Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Paris-Saclay, Université Paris-Saclay, 91405, Orsay, France., Zargaleh SA; Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Paris-Saclay, Université Paris-Saclay, 91405, Orsay, France., Takai K; Department of Chemical Science and Technology, Hosei University, 3-7-2, Kajino, Koganei, Tokyo, 184-8584, Japan., Shakhov FM; Ioffe Institute, Polytechnicheskaya 26, St. Petersburg, 194021, Russia., Hogan BT; Department of Engineering, University of Exeter, Exeter, EX4 4QF, UK. bh341@exeter.ac.uk., Baldycheva A; Department of Engineering, University of Exeter, Exeter, EX4 4QF, UK.
Jazyk: angličtina
Zdroj: Nanoscale research letters [Nanoscale Res Lett] 2019 Aug 16; Vol. 14 (1), pp. 279. Date of Electronic Publication: 2019 Aug 16.
DOI: 10.1186/s11671-019-3111-y
Abstrakt: The content of nitrogen-vacancy (NV - ) colour centres in the nanodiamonds (DNDs) produced during the detonation of nitrogen-containing explosives was found to be 1.1 ± 0.3 ppm. This value is impressive for nanodiamonds of size < 10 nm with intentionally created NV - centres. The concentration was estimated from the electron paramagnetic resonance as determined from the integrated intensity of the g = 4.27 line. This line is related with "forbidden" ∆m s  = 2 transitions between the Zeeman levels of a NV - centre's ground triplet state. Confocal fluorescence microscopy enables detection of the red photoluminescence (PL) of the NV - colour centres in nanoscale DND aggregates formed from the 5-nm nanoparticles. Subwavelength emitters consisting of NV - with sizes a few times smaller than the diffraction-limited spot are clearly distinguished. We have further observed an abrupt drop in the PL intensity when mixing and anti-crossing of the ground and excited states spin levels in NV - occurs under an applied external magnetic field. This effect is a unique quantum feature of NV - centres, which cannot be observed for other visible domain light-emitting colour centres in a diamond lattice.
Databáze: MEDLINE
Externí odkaz: