Spectroscopic study on the surface functional groups of the hydrogenated detonation nanodiamond
Bo-Nian Chen1*, Rajakar Selvam1, Chia-Liang Cheng1
1Department of Physics, National Dong Hwa University, Hualien, Taiwan
* Presenter:Bo-Nian Chen, email:410814316@gms.ndhu.edu.tw
Nanodiamond is a promising nanomaterial in the carbon family for its physical, chemical, and optical properties together with their tailorable surface and biocompatibility nature. However, detonation produced, ultrafine particles having an average size of 5 nm tend to form a tight core aggregate particle with a diameter of 100-200 nm in range. In this study, we hydrogenated the nanodiamond of 5 nm with an initial diameter of around 90 nm and separated the particle size using different forces of centrifugations; and whose surface and structural properties were studied using IR and Raman spectroscopy. Size distribution and the morphology has been studied using Dynamic Light Scattering (DLS) and Scanning Electron Microscope (SEM). The effects of centrifugation allowed separating larger particles (along with the disordered carbon structures) from the relative well dispersed hydrogenated smaller ND particles. The sediments reveals the complex functional groups in the IR spectra in the 600-1500 cm-1 region. Results confirmed these complex spectra often observed in the IR spectra are from the larger, and disordered structures. The understanding of the distribution of ordered and disordered carbon allow us preparing well dispersive hydrogenated ND with very narrow particle size distribution in the single digit nanometer range.

Keywords: Nanodiamond, Hydrogenation, Aggregation