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Synthesis of nano-diamond-like carbon for protective optical window coating applications

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Abstract

This study reports the fabrication of carbon using ions of carbon generated by high temperature, high density and extremely non-equilibrium argon plasma produced in modified dense plasma focus device. Carbon is deposited using two bursts of focussed plasma on n-type silicon substrates kept at a temperature of 20 (room temperature) and 130°C. The formation of nano-diamond-like carbon (nano-DLC) is observed at substrate temperature of 130°C. The samples deposited at different substrate temperatures are found to have amorphous in nature as observed from X-ray diffraction studies. These amorphous samples of carbon and nano-DLC possess nanostructures of average size ~27 and ~10 nm for 20 and 130°C substrate temperature, respectively, as obtained from atomic force microscopy and scanning electron microscopy studies. The possibility of formation of nano-DLC was analysed using Raman measurements. Peaks related to D and G band of graphitic carbon are observed in Raman spectra of both the samples. However, the samples grown at substrate temperature of 130°C show peaks related to nano-grain of diamond in Raman spectra, indicating high sp3 content, thereby confirming the formation of nano-DLC. The hardness measurement reveals the maximum value of hardness ~45.5 GPa for nano-DLC sample, which reconfirms that sample is of nano-DLC nature. The nano-DLC are found to have band gap of ~2.45 eV, which makes the nano-DLC a potential candidate for applications in protective optical window coating.

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Acknowledgements

We are thankful to University Science Instrumentation Center (USIC), University of Delhi, for providing facilities to characterize the samples.

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Authors and Affiliations

  1. Physics Department, Daulat Ram College, University of Delhi, Delhi, 110007, India

    Onkar Mangla & Savita Roy

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  1. Onkar Mangla
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  2. Savita Roy
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Correspondence to Onkar Mangla.

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Mangla, O., Roy, S. Synthesis of nano-diamond-like carbon for protective optical window coating applications. Bull Mater Sci 44, 273 (2021). https://doi.org/10.1007/s12034-021-02561-9

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  • DOI: https://doi.org/10.1007/s12034-021-02561-9

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