Real time microscopy, kinetics, and mechanism of giant fullerene evaporation.
作者： J. Y. Huang , Feng Ding , Kun Jiao , Boris I. Yakobson
DOI: 10.1103/PHYSREVLETT.99.175503
关键词:
摘要: We report in situ high-resolution transmission electron microscopy observing the shrinkage of single-layer giant fullerenes (GF). At temperatures approximately 2000 degrees C, GF volume reduces by greater than one 100-fold while fullerene shell remains intact, evolving from a slightly polygonized to nearly spherical shape with smaller diameter. The number carbon atoms decreases linearly time until small subbuckyball cage opens and rapidly disappears. Theoretical modeling indicates that are removed predominantly weakest binding energy sites, i.e., pentagons, leading constant evaporation rate. integrity is attributed collective behavior interacting defects. These results constitute first experimental evidence for "shrink-wrapping" "hot-giant" formation mechanisms.
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rice.edu 参考文章(26)
H. W. Kroto, J. R. Heath, S. C. O’Brien, R. F. Curl, R. E. Smalley, C 60 : Buckminsterfullerene Nature. ,vol. 318, pp. 162- 163 ,(1985) , 10.1038/318162A0
Feng Ding, Kun Jiao, Mingqi Wu, Boris I. Yakobson, Pseudoclimb and dislocation dynamics in superplastic nanotubes. Physical Review Letters. ,vol. 98, pp. 075503- ,(2007) , 10.1103/PHYSREVLETT.98.075503
Young-Kyun Kwon, David Tománek, Sumio Iijima, “Bucky Shuttle” Memory Device: Synthetic Approach and Molecular Dynamics Simulations Physical Review Letters. ,vol. 82, pp. 1470- 1473 ,(1999) , 10.1103/PHYSREVLETT.82.1470
J. Y. Huang, S. Chen, S. H. Jo, Z. Wang, D. X. Han, G. Chen, M. S. Dresselhaus, Z. F. Ren, Atomic-scale imaging of wall-by-wall breakdown and concurrent transport measurements in multiwall carbon nanotubes. Physical Review Letters. ,vol. 94, pp. 236802- ,(2005) , 10.1103/PHYSREVLETT.94.236802
F. Banhart, P. M. Ajayan, Carbon onions as nanoscopic pressure cells for diamond formation Nature. ,vol. 382, pp. 433- 435 ,(1996) , 10.1038/382433A0
H. W. Kroto, Fullerene cage clusters. The key to the structure of solid carbon Journal of the Chemical Society, Faraday Transactions. ,vol. 86, pp. 2465- 2468 ,(1990) , 10.1039/FT9908602465
Stephan Irle, Guishan Zheng, Marcus Elstner, Keiji Morokuma, From C2 Molecules to Self-Assembled Fullerenes in Quantum Chemical Molecular Dynamics Nano Letters. ,vol. 3, pp. 1657- 1664 ,(2003) , 10.1021/NL034739T
B. I. Yakobson, Mechanical relaxation and “intramolecular plasticity” in carbon nanotubes Applied Physics Letters. ,vol. 72, pp. 918- 920 ,(1998) , 10.1063/1.120873
Daniel Ugarte, Curling and closure of graphitic networks under electron-beam irradiation Nature. ,vol. 359, pp. 707- 709 ,(1992) , 10.1038/359707A0
Florian Banhart, Irradiation effects in carbon nanostructures Reports on Progress in Physics. ,vol. 62, pp. 1181- 1221 ,(1999) , 10.1088/0034-4885/62/8/201