Selective and high-yield synthesis of higher fullerenes
Journal Article
·
· Journal of Physical Chemistry
- SRI International, Menlo Park, CA (United States)
Fullerenes have been prepared by dc arc synthesis with graphite (anode) rods containing light elements such as B, Si, or Al in a series of concentrations. Furthermore, the influence of mixing N{sub 2} (g) with He(g) on the yield of higher fullerenes has been addressed. For each type of experiment, the relative fullerene yields are obtained from the relative peak areas in surface analysis by laser ionization-mass spectrometry (SALI-MS) spectra and the absolute yield of C{sub 60} and C{sub 70} from calibrated HPLC; the relative yields in SALI-MS represent closely the nascent distribution in the primary soots. We determine the approximate absolute yields of higher fullerenes, for which extinction coefficients are not yet available for HPLC analysis, by scaling the absolute C{sub 60} and C{sub 70} yields with the relative concentrations from SALI-MS. The most prominent increased higher fullerene yield was obtained with a 1% B-doped graphite rod with a 2:100 volume mixture of N{sub 2}(g): He(g); the absolute yield of C{sub 60} was reduced from 8.85% to 2.75%, and the yield of higher fullerenes such as C{sub 78} and C{sub 84} was increased by a factor of 2 over the pure C, pure He(g) case. We conclude that using a B-doped graphite rod and mixing in small amounts of N{sub 2}(g) into He(g) enhances both the absolute and relative yields of higher fullerenes. 18 refs., 4 figs., 3 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 171386
- Journal Information:
- Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 50 Vol. 99; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis and spectroscopy studies of fullerenes and discovery of macroscopic quantities of doped fullerenes
Synthesis of doped fullerenes
Generation, characterization and applications of fullerenes
Thesis/Dissertation
·
Tue Dec 31 23:00:00 EST 1991
·
OSTI ID:7166177
Synthesis of doped fullerenes
Conference
·
Mon Dec 30 23:00:00 EST 1996
·
OSTI ID:539099
Generation, characterization and applications of fullerenes
Thesis/Dissertation
·
Tue Dec 31 23:00:00 EST 1991
·
OSTI ID:7069680