期刊
NANOTECHNOLOGY
卷 22, 期 16, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/22/16/165604
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资金
- US Office of Naval Research (ONR) [MURI N00014-05-1-0432, N00014-09-1-0943]
- Nebraska Research Initiative
- Nebraska Center for Energy Science Research
A catalyst-free and highly efficient synthetic method for growing carbon nano-onions (CNOs) in open air has been developed through the laser resonant excitation of a precursor molecule, ethylene, in a combustion process. Highly concentric CNO particles with improved crystallinity were obtained at a laser wavelength of 10.532 mu m through the resonant excitation of the CH2 wagging mode of the ethylene molecules. A higher growth rate up to 2.1 g h(-1) was obtained, compared with that without a laser (1.3 g h(-1)). Formation of the CNOs with ordered graphitic shells is ascribed to the decomposition of polycyclic aromatic hydrocarbons (PAHs) into C-2 species. The optical limiting performances of the CNOs grown by the combustion processes were investigated. CNOs grown at 10.532 mu m laser excitation demonstrated improved optical limiting properties due to the improved crystallinity.
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