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Bio-Inspired Polydopamine Surface Modification of Nanodiamonds and its Reduction of Silver Nanoparticles
Journal of Visualized Experiments
  • Yun Zeng
  • Wenyan Liu
  • Risheng Wang, Missouri University of Science and Technology

Surface functionalization of nanodiamonds (NDs) is still challenging due to the diversity of functional groups on the ND surfaces. Here, we demonstrate a simple protocol for the multifunctional surface modification of NDs by using mussel-inspired polydopamine (PDA) coating. In addition, the functional layer of PDA on NDs could serve as a reducing agent to synthesize and stabilize metal nanoparticles. Dopamine (DA) can self-polymerize and spontaneously form PDA layers on ND surfaces if the NDs and dopamine are simply mixed together. The thickness of a PDA layer is controlled by varying the concentration of DA. A typical result shows that a thickness of ~5 to ~15 nm of the PDA layer can be reached by adding 50 to 100 µg/mL of DA to 100 nm ND suspensions. Furthermore, the PDA-NDs are used as a substrate to reduce metal ions, such as Ag[(NH3)2]+, to silver nanoparticles (AgNPs). The sizes of the AgNPs rely on the initial concentrations of Ag[(NH3)2]+. Along with an increase in the concentration of Ag[(NH3)2]+, the number of NPs increases, as well as the diameters of the NPs. In summary, this study not only presents a facile method for modifying the surfaces of NDs with PDA, but also demonstrates the enhanced functionality of NDs by anchoring various species of interest (such as AgNPs) for advanced applications.

Keywords and Phrases
  • Chemistry,
  • Issue 141,
  • Nanodiamonds,
  • Polydopamine,
  • Reduction,
  • Self-polymerization,
  • Silver nanoparticles,
  • Surface modification
Document Type
Article - Journal
Document Version
Final Version
File Type
© 2018 Journal of Visualized Experiments, All rights reserved.
Publication Date
Citation Information
Yun Zeng, Wenyan Liu and Risheng Wang. "Bio-Inspired Polydopamine Surface Modification of Nanodiamonds and its Reduction of Silver Nanoparticles" Journal of Visualized Experiments Vol. 2018 Iss. 141 (2018) ISSN: 1940-087X
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