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Size decrease of detonation nanodiamonds by air annealinginvestigated by AFM

Published online by Cambridge University Press:  19 January 2016

Stepan Stehlik*
Affiliation:
Institute of Physics, ASCR, Cukrovarnicka 10, Prague 16200, Czech Republic
Daria Miliaieva
Affiliation:
Institute of Physics, ASCR, Cukrovarnicka 10, Prague 16200, Czech Republic Faculty of Electrical Engineering, Czech Technical University, Technicka 2, 16627 Prague 6, Czech Republic
Marian Varga
Affiliation:
Institute of Physics, ASCR, Cukrovarnicka 10, Prague 16200, Czech Republic
Alexander Kromka
Affiliation:
Institute of Physics, ASCR, Cukrovarnicka 10, Prague 16200, Czech Republic
Bohuslav Rezek
Affiliation:
Institute of Physics, ASCR, Cukrovarnicka 10, Prague 16200, Czech Republic Faculty of Electrical Engineering, Czech Technical University, Technicka 2, 16627 Prague 6, Czech Republic
*
*(Email: stehlik@fzu.cz)
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Abstract

Nanodiamonds (NDs) represent a novel nanomaterial applicable from biomedicine tospintronics. Here we study ability of air annealing to further decrease thetypical 5 nm NDs produced by detonation synthesis. We use atomic forcemicroscopy (AFM) with sub-nm resolution to directly measure individualdetonation nanodiamonds (DNDs) on a flat Si substrate. By means of particleanalysis we obtain their accurate and statistically relevant size distributions.Using this approach, we characterize evolution of the size distribution as afunction of time and annealing temperature: i) at constant time (25 min) withchanging temperature (480, 490, 500°C) and ii) at constant temperature(490°C) with changing time (10, 25, 50 min). We show that the mean sizeof DNDs can be controllably reduced from 4.5 nm to 1.8 nm without noticeableparticle loss and down to 1.3 nm with 36% yield. By air annealing the sizedistribution changes from Gaussian to lognormal with a steep edge around 1 nm,indicating instability of DNDs below 1 nm.

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Copyright
Copyright © Materials Research Society 2016 

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