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6CCVD Research

Influence of degree of air oxidation and functionality on ensemble emission from nitrogen vacancy centers in nano-diamonds

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2019-05-22
JournalDiamond and Related Materials
AuthorsRavi Kumar, Dilip K. Singh, Prashant Kumar, Raj Kumar, Sanjay R. Dhakate
InstitutionsAcademy of Scientific and Innovative Research, Birla Institute of Technology, Mesra
Citations13

Abstract

Section titled ā€œAbstractā€

Oxygen functionalities in Nano-diamonds (NDs) are accepted as emission and photo-stability enhancer of nitrogen vacancy (NV) centers. In this direction, we have investigated the effect of functional groups and oxygen content on emission and stability of NV centers at ensemble level. Optimized air oxidation conditions (600 Ā°C, 2 h) and hydrogen plasma treatment (500 Ā°C, 20 min) are used to vary functionality and oxygen content. The emission from NV centers in plasma treated NDs (-OH group) is ~ 5 times higher as compared to oxidized sample (-OH, Cdouble bondO and COOO). The probability of finding emitting NV center in any crystallite is ~52% for plasma treated NDs; much higher than oxidized sample (7%). Confocal microscopy revealed continuous emission blinking from air oxidized sample and stable emission ( 8 min) for plasma treated NDs. We propose that laser excitation causes detachment of oxygen from -OH, Cdouble bondO and COOO groups and formation of electron trapping states at surface in oxidized sample which leads to NV emission blinking. Whereas, the -OH group detached from plasma treated NDs has electron withdrawing nature. Hence, emission as well as photo stability of NV centers is increased upon reducing degree of oxidation and changing functionality in NDs.

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Original Source

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References

Section titled ā€œReferencesā€
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