TY - JOUR
T1 - Carbon Cluster Ions from Low- and High-Temperature Glassy Carbon, Highly Oriented Pyrolytic Graphite, and Polycrystalline Graphite
AU - May, Michael A.
AU - Huston, Michael E.
AU - Callstrom, Matthew R.
AU - Marshall, Alan G.
PY - 1993
Y1 - 1993
N2 - Carbon cluster ions have been produced by pulsed Nd:YAG laser desorption of four sp2-hybridized carbon solids: glassy carbon-6 (GC-6), glassy carbon-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 (C44+ to C124+). GC-6, synthesized by a low-temperature route, gave increased ion populations from C14− to C25− relative to conventional GC-25. Laser desorption of the organic precursor, poly (phenylenediacetylene), yielded fullerenes from C60+ to C150+ in positive-ion mode, and C3− to C10− in negative-ion mode. The present results show that (a) pulsed laser desorption of polycrystalline graphite produces a higher yield of fullerene cations compared to other sp2-type carbon solids, (b) low-mass carbon cluster ions from C14 to C30 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.
AB - Carbon cluster ions have been produced by pulsed Nd:YAG laser desorption of four sp2-hybridized carbon solids: glassy carbon-6 (GC-6), glassy carbon-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 (C44+ to C124+). GC-6, synthesized by a low-temperature route, gave increased ion populations from C14− to C25− relative to conventional GC-25. Laser desorption of the organic precursor, poly (phenylenediacetylene), yielded fullerenes from C60+ to C150+ in positive-ion mode, and C3− to C10− in negative-ion mode. The present results show that (a) pulsed laser desorption of polycrystalline graphite produces a higher yield of fullerene cations compared to other sp2-type carbon solids, (b) low-mass carbon cluster ions from C14 to C30 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.
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U2 - 10.1021/cm00029a012
DO - 10.1021/cm00029a012
M3 - Article
AN - SCOPUS:0042834028
SN - 0897-4756
VL - 5
SP - 648
EP - 651
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 5
ER -