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23 results on '"Barnard, Amanda"'

3. Dynamic self-assembly of detonation nanodiamond in water

Author

Chang, Shery L. Y., primary, Reineck, Philipp, additional, Williams, Dewight, additional, Bryant, Gary, additional, Opletal, George, additional, El-Demrdash, Samir A., additional, Chiu, Po-Lin, additional, Ōsawa, Eiji, additional, Barnard, Amanda S., additional, and Dwyer, Christian, additional

Published
2020
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4. Counting vacancies and nitrogen-vacancy centers in detonation nanodiamond† †Electronic supplementary information (ESI) available: (1) DND synthesis; (2) HRTEM and EELS characterization methods; (3) EELS simulation method; (4) supporting figures of EELS simulations; (5) soft-X-ray K-edge spectra of the DND; and (6) ab initio N-V center modeling method. See DOI: 10.1039/C6NR01888B Click here for additional data file

Author

Chang, Shery L. Y., Barnard, Amanda S., Dwyer, Christian, Boothroyd, Chris B., Hocking, Rosalie K., Ōsawa, Eiji, and Nicholls, Rebecca J.

Subjects
Chemistry
Abstract

Vacancies and Nitrogen-vacancy centers in detonation nanodiamond particles can be detected and quantified., Detonation nanodiamond particles (DND) contain highly-stable nitrogen-vacancy (N-V) centers, making it important for quantum-optical and biotechnology applications. However, due to the small particle size, the N-V concentrations are believed to be intrinsically very low, spawning efforts to understand the formation of N-V centers and vacancies, and increase their concentration. Here we show that vacancies in DND can be detected and quantified using simulation-aided electron energy loss spectroscopy. Despite the small particle size, we find that vacancies exist at concentrations of about 1 at%. Based on this experimental finding, we use ab initio calculations to predict that about one fifth of vacancies in DND form N-V centers. The ability to directly detect and quantify vacancies in DND, and predict the corresponding N-V formation probability, has a significant impact to those emerging technologies where higher concentrations and better dispersion of N-V centres are critically required.

Published
2016

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