New fullerene-based mixed materials: Synthesis and characterization Page: 4 of 14
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95113
New Fullerene-Based Mixed Materials: Synthesis and Characterization
D. McBranch*, R. Kohilman, V. Klimov, M. Grigorova,
X. Shi, L. Smilowitz, and B.R. Mattes
Los Alamos National Laboratory
H. Wang and F. Wudl
University of California-Santa Barbara
Abstract
This is the final report of a three-year, Laboratory Directed Research and
Development (LDRD) project at the Los Alamos National Laboratory
(LANL). We present results of broadband femtosecond transient
absorption and broadband nanosecond optical limiting studies of C60 and
derivatized C60. We have investigated both solutions and solid-state mixed
materials (sol-gel glass hosts doped with fullerene guests). We show that
derivatized fullerenes provide enhanced solubility and processability, with a
ground-state absorption extended into the infrared compared with C60. We
have extensively studied both the dynamic optical response and the excited-
state absorption cross sections of solutions and solids for multiple
wavelengths in the visible to near infrared. Wavelength-dependent studies
show that the optical limiting response improves monotonically at longer
wavelengths, demonstrating broadband limiting in all 6,6 mono-adducts and
neat C60. We report new approaches to processing sol-gel glass/fullerene
composites to improve the optical limiting performance of solid-state
materials to approach the response of solution limiters.
Background and Research Objectives
Since the first isolation of Buckminsterfullerene (C60) in appreciable quantities
[Ref. 1], there has been an explosion of research into the unique properties of this new
form of carbon [Ref. 2]. The geometry of C60 resembles a soccer ball, with truncated
icosohedral (Ih) symmetry. The unique nonlinear optical properties of the fullerenes are
due to the highly polarizable conjugated x-electrons, which are delocalized over the surface
of the sphere. C60 can be modified by synthetic chemical techniques (including those
developed as part of this project). We have studied the effects of these modifications on the
optical and electronic properties of the fullerenes (Publications 1-3). We have explored the
*Principal Investigator, e-mail: mcbranch@lanl.gov1
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McBranch, D.; Kohlman, R.; Klimov, V.; Grigorova, M.; Shi, X.; Smilowitz, L. et al. New fullerene-based mixed materials: Synthesis and characterization, report, November 1, 1998; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc712523/m1/4/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.