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

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    • Keywords


      Nano-DLC; nanoparticles; deposition; scanning electron microscopy (SEM); Raman spectra; dense plasma focus.

    • 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 samplesdeposited 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 ${\sim}$27 and ${\sim}$10 nm for 20 and 130°C substrate temperature, respectively, as obtained from atomic force microscopy and scanning electron microscopy studies. The possibility of formation of nano-DLC was analysed using Raman measurements. Peaks related toD and G band of graphitic carbon are observed in Raman spectra of both the samples. However, the samples grown at substrate temperature of 130°C show peaks related to nano-grain of diamond in Raman spectra, indicating high sp$^3$ content, thereby confirming the formation of nano-DLC. The hardness measurement reveals the maximum value of hardness ${\sim}$45.5 GPa for nano-DLC sample, which reconfirms that sample is of nano-DLC nature. The nano-DLC arefound to have band gap of ${\sim}$2.45 eV, which makes the nano-DLC a potential candidate for applications in protective optical window coating.

    • Author Affiliations



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

  • Bulletin of Materials Science | News

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      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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