Carbon cluster ions from low- and high-temperature glassy carbon, highly oriented pyrolytic graphite, and polycrystalline graphite
Carbon cluster ions from low- and high-temperature glassy carbon, highly oriented pyrolytic graphite, and polycrystalline graphite
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DOI：
10.1021/cm00029a012
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发表时间：
1993-05
影响因子：
8.6
通讯作者：
M. A. May;Michael E. Huston;M. Callstrom;A. Marshall
中科院分区：
文献类型：
--
作者：
M. A. May;Michael E. Huston;M. Callstrom;A. Marshall
通过脉冲 Nd:YAG 激光解吸四种 sp[sup 2] 杂化碳固体产生碳簇离子：玻璃碳 6 (GC-6)、玻璃碳 25 (GC-25)、高取向热解石墨 (HOPG)、多晶石墨和 GC-6 的低聚物前体聚苯二乙炔。通过傅里叶变换离子回旋共振质谱法检测解吸的离子。在类似的激光和质谱条件下，多晶石墨产生丰富的富勒烯离子（C[sub 44][sup +] 至 C[sub 124][sup +]）。相对于传统的 GC-25，通过低温途径合成的 GC-6 的离子数量从 C[sub 14][minus] 增加到 C[sub 25][minus]。有机前体聚苯二乙炔的激光解吸，在正离子模式下产生从 C[sub 60][sup +] 到 C[sub 15-][sup +] 的富勒烯，在负离子模式下产生从 C[sub 3][minus] 到 C[sub 10][minus] 的富勒烯。目前的结果表明，（a）与其他 sp[sup 2] 型碳固体相比，多晶石墨的脉冲激光解吸产生更高产率的富勒烯阳离子，（b）从 C[sub 14] 到 C[sub 30] 的低质量碳簇离子始终从所有四种碳固体中产生为正离子，而不是负离子，以及（c）在这些实验条件下，任何碳固体都不会产生富勒烯阴离子，意味着正碳簇离子和负碳簇离子的形成机制不同。更多 » 59 条参考文献，3 个图，1 个选项卡。« less
Carbon cluster ions have been produced by pulsed Nd:YAG laser desorption of four sp[sup 2]-hybridized carbon solids: glassy carbon-6 (GC-6), glassy carbons-25 (GC-25), highly oriented pyrolytic graphite (HOPG), polycrystalline graphite, and the oligomeric precursor to GC-6, poly(phenylenediacetylene). The desorbed ions were detected by Fourier transform ion cyclotron resonance mass spectrometry. Under similar laser and mass spectrometry conditions, polycrystalline graphite yielded abundant fullerene ions (C[sub 44][sup +] to C[sub 124][sup +]). GC-6, synthesized by a low-temperature route, gave increased ion populations from C[sub 14][minus] to C[sub 25][minus] relative to conventional GC-25. Laser desorption of the organic precursor, poly(phenylenediacetylene), yielded fullerenes from C[sub 60][sup +] to C[sub 15-][sup +] in positive-ion mode, and C[sub 3][minus] to C[sub 10][minus] in negative-ion mode. The present results show that (a) pulsed laser desorption of polycrystalline graphite produces a higher yield of fullerence cations compared to other sp[sup 2]-type carbon solids, (b) low-mass carbon cluster ions from C[sub 14] to C[sub 30] are consistently produced from all four carbon solids as positive ions but not as negative ions, and (c) no fullerene anions are produced from any of the carbon solids under these experimental conditions, implying different formation mechanisms for positive and negative carbon cluster ions.more » 59 refs., 3 figs., 1 tab.« less