Laser ablation of diamond particles suspended in ethanol: Effective formation of long polyynes

• Published in: Carbon (New York) Vol. 44; no. 3; pp. 522 - 529
• Main Authors: Tabata, Hiroshi, Fujii, Minoru, Hayashi, Shinji
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.03.2006; Elsevier Science
• Subjects: Carbyne; Cross-disciplinary physics: materials science; rheology; Diamond; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; Graphitization; Laser irradiation; Materials science; Physics; Specific materials; Spectrophotometry; Diamond; Laser irradiation; Spectrophotometry; Carbyne; Graphitization; Suspended particle; Particle size; Ethanol; Lasers; Chain length; Diamonds; Distribution; Graphite; Alkanol; Mechanism; Alcohols
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2005.08.007

Polyynes were synthesized by laser ablation of diamond particles with various sizes suspended in ethanol. Chain length distributions and total yields of polyynes produced were compared with those produced from graphitized diamond particles and graphite particles. The relative amounts of long polyynes such as C 14H 2 and C 16H 2 produced from diamond particles were found to be larger than those from graphitized diamond particles and graphite particles. From the change of the chain length distribution with the laser irradiation time, it is concluded that the long polyynes are produced directly from diamond particles at the initial stage of ablation. Furthermore, the total yield of polyynes was found to increase with the size of diamond particles and decrease as their graphitization proceeds. Possible mechanisms of these results are discussed.