Carbon Cluster Ions from Low- and High-Temperature Glassy Carbon, Highly Oriented Pyrolytic Graphite, and Polycrystalline Graphite

Michael A. May, Michael E. Huston, Matthew R. Callstrom, Alan G. Marshall

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)648-651
Number of pages4
JournalChemistry of Materials
Volume5
Issue number5
DOIs
StatePublished - 1993

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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