Hydroxyl radical production induced by plasma hydrogenated nanodiamonds under X-ray irradiationElectronic supplementary information (ESI) available: Experimental procedures and curves for the additional experiments. See DOI: 10.1039/c6cc08895c

For the first time, overproduction of hydroxyl radicals (HO&z.rad;) induced by plasma hydrogenated detonation nanodiamonds (H-NDs) under X-ray irradiation is reported. Using coumarin (COU) as a fluorescent probe, we reveal a significant increase of 40% of the HO&z.rad; production in the presence of H-NDs (6-100 μg ml −1 ) compared with water alone. This effect is related to the negative electron affinity of the hydrogenated nanodiamonds and illustrates the ability of H-NDs to produce reactive oxygen species probably via electron emission in water under X-ray irradiation. For the first time, overproduction of hydroxyl radicals (HO&z.rad;) induced by plasma hydrogenated detonation nanodiamonds (H-NDs) under X-ray irradiation is reported.