1.Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
2.Institut de Chimie de la Matière Condensée de Bordeaux-ICMCB-CNRS 87, Pessac, 33608, France
3.Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
YF Lu, Email: ylu2@unl.edu
纸质出版日期:2018,
网络出版日期:2018-04-06,
收稿日期:2017-11-15,
修回日期:2017-12-20,
录用日期:2017-12-20
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Ultraviolet laser photolysis of hydrocarbons for nondiamond carbon suppression in chemical vapor deposition of diamond films[J]. LSA, 2018,7(3):17177-9.
Fan, L. S. et al. Ultraviolet laser photolysis of hydrocarbons for nondiamond carbon suppression in chemical vapor deposition of diamond films. Light: Science & Applications, 7, 17177 (2018).
Ultraviolet laser photolysis of hydrocarbons for nondiamond carbon suppression in chemical vapor deposition of diamond films[J]. LSA, 2018,7(3):17177-9. DOI: 10.1038/lsa.2017.177.
Fan, L. S. et al. Ultraviolet laser photolysis of hydrocarbons for nondiamond carbon suppression in chemical vapor deposition of diamond films. Light: Science & Applications, 7, 17177 (2018). DOI: 10.1038/lsa.2017.177.
In this work
we demonstrate that ultraviolet (UV) laser photolysis of hydrocarbon species alters the flame chemistry such that it promotes the diamond growth rate and film quality. Optical emission spectroscopy and laser-induced fluorescence demonstrate that direct UV laser irradiation of a diamond-forming combustion flame produces a large amount of reactive species that play critical roles in diamond growth
thereby leading to enhanced diamond growth. The diamond growth rate is more than doubled
and diamond quality is improved by 4.2%. Investigation of the diamond nucleation process suggests that the diamond nucleation time is significantly shortened and nondiamond carbon accumulation is greatly suppressed with UV laser irradiation of the combustion flame in a laser-parallel-to-substrate geometry. A narrow amorphous carbon transition zone
averaging 4 nm in thickness
is identified at the film–substrate interface area using transmission electron microscopy
confirming the suppression effect of UV laser irradiation on nondiamond carbon formation. The discovery of the advantages of UV photochemistry in diamond growth is of great significance for vastly improving the synthesis of a broad range of technically important materials.
combustion chemical vapor depositiondiamondphotolysisultraviolet laser
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