Abstract
The optical properties of N-ion-implanted diamond are evaluated. The color of implanted layer became glossy black with metallic luster, which was further enhanced after postimplantation annealing at 600 °C for 2 h in vacuum or inert gas atmosphere. Raman spectroscopy revealed that the crystalline diamond became completely disordered after irradiation, but surprisingly the crystalline nature was restored to a mixture of well-defined diamond and diamond-like carbon after annealing. When it was annealed in air at the same temperature, however, the black color disappeared, indicating a removal of the disordered or graphitized layer by oxidation. X-ray photoelectron spectroscopy and Raman analyses indicate that the black color of as-implanted diamond is associated mainly with the disordered carbon and modified band structure. Fourier transform infrared (FTIR) analysis shows that the implanted nitrogen atoms are in N–N and symmetrical 4N-vacancy bonding states, which are commonly found in the natural diamonds with yellow and brown tint.
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This work was supported through Proton Engineering Frontier Project from the Ministry of Science and Technology, Republic of Korea.
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Park, JW., Kim, HJ. & Kim, YC. Optical properties of the black diamond produced by ion implantation. Journal of Materials Research 26, 1572–1576 (2011). https://doi.org/10.1557/jmr.2011.201
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DOI: https://doi.org/10.1557/jmr.2011.201