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Stable ensemble brightness from nitrogen vacancy centers in nanodiamonds through optimized surface composition

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Title Statement Stable ensemble brightness from nitrogen vacancy centers in nanodiamonds through optimized surface composition
 
Added Entry - Uncontrolled Name Sandeep; CSIR-National Physical Laboratory, Dr K S Krishnan Marg, New Delhi 110 012, India
Kumar, Ravi ; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201 002, India
Subhedar, Kiran Mahadeo; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201 002, India
Kumar, Raj ; Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110 067, India
Dhakate, Sanjay Rangnath; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201 002, India
 
Uncontrolled Index Term Nanodiamonds, Nitrogen vacancy centers, Air oxidation, Ensemble photo-stability
 
Summary, etc. Stable ensemble emission from nitrogen vacancy (NV) centers in nanodiamonds (NDs) is highly desirable for diverse areas ranging from bio-imaging to quantum optics. The uniqueness of NV centers lies in their opto-spin properties like energy level structure, emission range (620-850 nm) and optical spin polarization. The host matrix (NDs), however, put some limitation on the photo-physical properties of these color centers. One of the major issues is surface proximity (where high concentration of defects are present) of NV centers. The NV centers being highly sensitive to the neighboring environment are unstable in such circumstances. The surface of NDs mainly exhibit non-diamond carbon which is well-known quencher of emission due to NV centers. The surface composition for desirable photo-physical properties of NV centers is still unknown. Here, we have systemically studied the effect of oxidation time at low oxidation temperature (450 <sup>o</sup>C) on the selective removal of <em>sp<sup>2</sup></em> carbon, aqueous dispersion of NDs and emission collection due to NV centers at ensemble level. Among different air oxidations, heat treatment at 450 <sup>o</sup>C at residual time of 8 hours has been found to be suitable air oxidation conditions for the enhancement of brightness and ensemble photo-stability of NV centers.
 
Publication, Distribution, Etc. Indian Journal of Engineering and Materials Sciences (IJEMS)
2021-03-24 10:24:59
 
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http://op.niscair.res.in/index.php/IJEMS/article/view/46846
 
Data Source Entry Indian Journal of Engineering and Materials Sciences (IJEMS); ##issue.vol## 27, ##issue.no## 6 (2020): IJEMS- DECEMBER 2020
 
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