Detonation nanodiamonds (DNDs) with a typical size of 5 nm have attracted broad interest in science and technology. Further size reduction of DNDs would bring these nanoparticles to the molecular-size level and open new prospects for research and applications in various fields, ranging from quantum physics to biomedicine. Here we show a controllable size reduction of the DND mean size down to 1.4 nm without significant particle loss and with additional disintegration of DND core agglutinates by air annealing, leading to a significantly narrowed size distribution (±0.7 nm). This process is scalable to large quantities. Such molecular-sized DNDs keep their diamond structure and characteristic DND features as shown by Raman spectroscopy, infrared spectroscopy, STEM and EELS. The size of 1 nm is identified as a limit, below which the DNDs become amorphous.

Faculty of Electrical Engineering Czech Technical University Prague Technická 2 Prague 16627 Czech Republic

Institute of Physics ASCR Cukrovarnická 10 Prague 162 00 Czech Republic

Physics of Nanostructured Materials Faculty of Physics University of Vienna Boltzmanngasse 5 1090 Vienna Austria

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