In-situ IR spectroscopy of an oxygen-acetylene flame during diamond film growth

In situ infrared measurements on TiO2 flames: Gas and particle concentrations

“…for the H O in the standard spectrum to obtain the mol 2 fraction of H O for the experimental spectrum. 2 Standard CO bands were also simulated using 2 HITRANrHITEMP for different wavenumber ranges, but they were found not to be as accurate when compared to the experimental spectra due to the presence of H O in the same 2 Ž y1 . regions 1,000᎐500 cm .…”

“…They found that the highest CO temperature ranged between 2,200 and 2,600 2 K, while the highest particle temperature ranged between Ž . 1,900 and 2,000 K. In other work, Morrison et al 1990 studied diamond growth in an oxygen᎐acetylene flame using FTIR ErT analysis. They estimated temperatures for the various species in the flame and found that the temperature of CO 2 ranged between 2,800 and 3,300 with a variation of "50 K.…”

Optimizing diamond growth for an atmospheric oxyacetylene torch

“…The results of such research serve three purposes: (i) it more accurately identifies the "optimum" conditions for growth (which depend on the properties desired), (ii) allows direct comparison to the enclosed flame work of Morrison et al, 12 and (iii) serves as a benchmark for future research involving systematic studies involving cycling of the growth conditions [13][14][15] and in situ measurements using Fourier transform infrared spectroscopy. [16][17][18] In this work, the films are grown on a Mo substrate under various conditions of flow ratio (R O 2 ͞C 2 H 2 ), substrate temperature (T s ), and total gas flow rate (Q). We characterized each sample using scanning electron microscopy, Raman spectroscopy, and x-ray diffraction to determine the growth rate, diamond quality, and crystallographic texture of the films.…”