Functional surfaces of carbon materials

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Surface-functionalisation of nanodiamonds

Thanks to their outstanding mechanical performance, unique photoluminescent and spin properties, superior biocompatibility and tunable surface, nanodiamonds find promising applications in fields of wear-resistance coating, sensing, biolabeling and drug delivery. Modulation of surface functionality is of crucial importance for the desired properties. By using a radiation chemistry approach (Fig.1), we achieved surface chlorination of nanodiamonds (diameter approximetely 10-40 nm) with high efficiency. The combination of XPS, ATR-FTIR and in-source thermal desorption mass spectrometry (IS-TD-MS) measurements confirmed a remarkable covalently chlorine-functionalized surface after irradiatiion of hydrogenated nanodiamonds (HND) in CCl4 using an 10 MeV electron beam (Fig.2) at doses ≥ 300 kGy (Fig.3). Chlorinated surfaces are expected to allow an easy further surface modification of nanodiamonds for novel applications.

 

 

Fig. 1 Principle of EB-induced functionalization.
Solvent: CCl4, CHCl3 and/or CH2Cl2
BND: Bucky ND with sp2 carbon shells HND: H-terminated ND
Fig. 2: 10 MeV linear electron accelerator (Mevex): 8 μs/pulse, 250 mA/pulse, 450 Hz, 25 kGy/path.
Fig. 3: Dose dependent chlorine loadings: best results for hydrogenated NDs in CCl4 at doses > 500 kGy. Cl surface concentration ≥ 8.6 atom/nm2, i.e. Cl coverage is ~ 39-62%.


Selected Publications

  • C. Laube, T. Oeckinghaus, J. Lehnert, J. Griebel, W. Knolle, A. Denisenko, A. Kahnt, J. Meijer, J. Wrachtrup, B. Abel
    Controlling the Fluorescence Properties of Nitrogen Vacancy Centers in Nanodiamonds

    Nanoscale 11 (2019), 1770-1783
    doi: 10.1039/C8NR07828A

  • J. Zhou, C. Laube, W. Knolle, S. Naumov, A. Prager, F. D. Kopinke, B. Abel
    Efficient chlorine atom functionalization at nanodiamond surfaces by electron beam irradiation

    Diamond Relat. Mater. 82 (
    2018) 150 – 159
    doi.org/10.1016/j.diamond.2018.01.012