Multiple flame deposition of diamond films

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Abstract
A multiple flame burner has been used to deposit diamond films of up to 20 mm in diameter from an oxygen-acetylene mixture. The burner consists of nine equally spaced linear holes each sustaining its own flame and rotates under a water-cooled substrate. The diamond film’s quality is characterized as a function of its radial distance from the center of the film by scanning electron microscopy, Raman spectroscopy, and photoluminescence spectroscopy. Typical films exhibit variations in thickness and crystal structure with an increasing graphitic component present towards the edge of the film as evidenced by Raman analysis. Photoluminescence spectra exhibit defect bands at 1.95 eV present near the outer edge of the film and at 2.16 eV present near the center of the film. These luminescence bands are discussed and attributed to defects induced from the flame’s chemistry.

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