We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Effect of heat treatment on fluorescence characteristics of HPHT and detonation nanodiamonds.
- Authors
Wei, J. J.; Jing, D. H.; Li, H.; Liu, J. L.; Ochalski, T. J.; Li, C. M.
- Abstract
In this study, high-pressure high-temperature nanodiamonds (HPHT NDs) and detonation nanodiamonds (DNDs) were both treated by air oxidation to investigate the influence of heat treatment on the aggregate size distribution, surface state and fluorescence characteristics of nanodiamonds (NDs). The results show that the oxidation in air can reduce the aggregate size distribution and increase the surface oxygen group concentration of both NDs. It can also improve the crystalline quality as well, by removing the non-diamond sp2 carbon phase on the surface. However, the HPHT NDs and DNDs show very different fluorescence intensity variation as a function of heat treatment. It is observed that the average fluorescence intensity of HPHT NDs increases by 24.5% due to the removal of non-diamond sp2 carbon, which is believed to cause the emission quenching of HPHT NDs. Therefore, the internal Nitrogen-vacancy (NV) defects in the sp3 structure are speculated as the dominated source of the luminescence for HPHT NDs. On the contrary, the average fluorescence intensity of DNDs decreases with an increase in heat treatment time. It can be inferred that the fluorescence origin of DNDs mainly comes from fluorophore related to the surface non-diamond sp2 carbon, rather than the internal NV defects.
- Subjects
NANODIAMONDS; HEAT treatment; DIAMONDS; FLUORESCENCE; ENTHALPY; SURFACE states; TREATMENT effectiveness
- Publication
Applied Nanoscience, 2022, Vol 12, Issue 11, p3449
- ISSN
2190-5509
- Publication type
Article
- DOI
10.1007/s13204-022-02692-3