Not All Fluorescent Nanodiamonds Are Created Equal: A Comparative Study

0503799 - ÚOCHB 2020 RIV DE eng J - Journal Article
Reineck, P. - Trindade, L. F. - Havlík, Jan - Štursa, Jan - Heffernan, A. - Elbourne, A. - Orth, A. - Capelli, M. - Cígler, Petr - Simpson, D. A. - Gibson, B. C.
Not All Fluorescent Nanodiamonds Are Created Equal: A Comparative Study.
Particle & Particle Systems Characterization. Roč. 36, č. 3 (2019), č. článku 1900009. ISSN 0934-0866. E-ISSN 1521-4117
R&D Projects: GA ČR(CZ) GA18-17071S; GA MŠMT 8C18004; GA MŠMT(CZ) EF16_019/0000729; GA MŠMT EF16_026/0008382; GA MŠMT(CZ) LM2011019; GA MŠMT LM2015056
Institutional support: RVO:61388963 ; RVO:61389005
Keywords : fluorescence * nanodiamonds * nitrogen-vacancy center * optical characterization * quantum properties
OECD category: Nano-materials (production and properties)
Impact factor: 3.099, year: 2019
Method of publishing: Limited access
https://onlinelibrary.wiley.com/doi/abs/10.1002/ppsc.201900009

Fluorescent nanodiamonds (FNDs) are vital to many emerging nanotechnological applications, from bioimaging and sensing to quantum nanophotonics. Yet, understanding and engineering the properties of fluorescent defects in nanodiamonds remain challenging. The most comprehensive study to date is presented, of the optical and physical properties of five different nanodiamond samples, in which fluorescent nitrogen-vacancy (NV) centers are created using different fabrication techniques. The FNDs' fluorescence spectra, lifetime, and spin relaxation time (T-1) are investigated via single-particle confocal fluorescence microscopy and in ensemble measurements in solution (T-1 excepted). Particle sizes and shapes are determined using scanning electron microscopy and correlated with the optical results. Statistical tests are used to explore correlations between the properties of individual particles and also analyze average results to directly compare different fabrication techniques. Spectral unmixing is used to quantify the relative NV charge-state (NV- and NV0) contributions to the overall fluorescence. A strong variation is found and quantified in the properties of individual particles within all analyzed samples and significant differences between the different particle types. This study is an important contribution toward understanding the properties of NV centers in nanodiamonds. It motivates new approaches to the improved engineering of NV-containing nanodiamonds for future applications.
Permanent Link: http://hdl.handle.net/11104/0296713