Nano-diamond particles are synthesised by detonation of TNT and Hexogen, resulting in a shockwave which produces diamond nanoparticles with an average size of around 5 nm, aggregated by non-diamond carbon into larger (>100 nm) agglutinates. Recently it has been shown that these large aggregates can be broken down into core particles by simply annealing in hydrogen gas and that the rate that these particles are broken down is influenced by the size of the nano-diamonds. In order to explain this effect we need to understand the nature of the surface hydrogen bonding to this diamond/non-diamond matrix. Specifically, we need to understand if the hydrogen bonding is predominantly to sp2 or sp3 carbon and the influence of particle size. We will prepare 4 samples that will allow us to investigate the degree of surface hydrogenation in nano-scale diamond.