4.7 Article

Scalable Fabrication of Clean Nanodiamonds via Salt-Assisted Air Oxidation: Implications for Sensing and Imaging

期刊

ACS APPLIED NANO MATERIALS
卷 4, 期 9, 页码 9223-9230

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c01751

关键词

nanodiamond; purification; salt-assisted; air oxidation; clean surface; rounded shape

资金

  1. HKSAR Research Grants Council (RGC) General Research Fund (GRF) [14306117]
  2. HKSAR Innovation and Technology Fund (ITF): Platform Projects of the Innovation and Technology Support Programme (ITSP) [ITS/293/19FP]
  3. HKU Start-Up Grant
  4. Small Equipment Grant [102009812]
  5. Early Career Scheme (ECS) [27202919]
  6. [201810159001]

向作者/读者索取更多资源

A salt-assisted air oxidation treatment method has been developed to purify nanodiamonds, effectively removing impurities and enabling scalable production with a rounded shape. This discovery is expected to promote the widespread use of nanodiamonds in scientific and industrial fields.
Nanodiamonds (NDs) have many potential applications, but their development is dependent on obtaining a well-defined surface through cleaning. Several purification methods, such as the promising air oxidation together with centrifugation, have been developed to remove the surface-adsorbed impurities on NDs. These stochastic impurities mainly consist of both ultrasmall NDs and nondiamond structures (e.g., disordered carbons), which are unavoidably generated during the synthesis and processing of diamond materials. However, it is difficult to eliminate these unwanted parts using existing methods, which restrict the widespread usage of NDs. Here, we developed a simple, reliable, and reproducible purification method, namely, the salt-assisted air oxidation treatment, requiring only one additional prestep, that is, mixing NDs with a proper amount of salt crystals (e.g., sodium chloride) prior to conventional oxidation. The developed method enables scale-up manufacturing of clean NDs, with a rounded shape transformed from the original shard-like shape. Furthermore, we uncovered the exact role of salt crystals in eliminating impurities during oxidation. These findings will significantly enhance the scope of these little gemstones in diverse scientific and industrial fields, particularly in demanding areas such as biomedical and quantum sensing requiring stable and sound surface functionalities.

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