Resonant excitation of ethylene molecules in the combustion flame CVD of diamond using a wavelength tunable CO2 laser

Z. Q. Xie; J. B. Park; X. N. He; Y. Gao; Y. S. Zhou; Y. F. Lu

doi:10.1117/12.843904

23 February 2010 Resonant excitation of ethylene molecules in the combustion flame CVD of diamond using a wavelength tunable CO₂ laser

Z. Q. Xie, J. B. Park, X. N. He, Y. Gao, Y. S. Zhou, Y. F. Lu

Author Affiliations +

Proceedings Volume 7585, Laser-based Micro- and Nanopackaging and Assembly IV; 758509 (2010) https://doi.org/10.1117/12.843904
Event: SPIE LASE, 2010, San Francisco, California, United States

Abstract

CO₂ laser resonant excitations of precursor molecules were applied in combustion flame synthesis of diamond films. The combustion flame was produced from a mixture of ethylene (C₂H₄), acetylene (C₂H₂) and oxygen (O₂). A wavelength-tunable CO₂ laser with wavelength range from 9.2 to 10.9 μm was used for wavelength-matched excitation of the ethylene molecules. By irradiating the flame using CO₂ laser at 10.532 μm, the ethylene molecules were resonantly excited through the CH₂ wagging vibrational mode (ν₇, 949.3 cm^-1). Irradiation of the flame using the common CO₂ laser wavelength at 10.591 μm was also carried out for comparison. It was found that diamond synthesis was more obviously enhanced by the CO₂ laser resonant excitation at 10.532 μm as compared to that at 10.591 μm. Firstly, the flame was shortened by 50%, indicating a promoted reaction in the process. Secondly, the diamond grain sizes as well as the diamond film thicknesses were increased by 200~300% and 160% respectively, indicating a higher growth rate of diamond films. Finally, Raman spectra of the diamond sample showed a sharp diamond peak at 1334 cm^-1 and a suppressed G-band, indicating higher diamond quality.

Citation Download Citation

Z. Q. Xie, J. B. Park, X. N. He, Y. Gao, Y. S. Zhou, and Y. F. Lu "Resonant excitation of ethylene molecules in the combustion flame CVD of diamond using a wavelength tunable CO₂ laser", Proc. SPIE 7585, Laser-based Micro- and Nanopackaging and Assembly IV, 758509 (23 February 2010); https://doi.org/10.1117/12.843904

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available