DOI: 10.1557/jmr.1993.1875. Characterization of carbon aerogels by transport measurements

Characterization of carbon aerogels by transport measurements

10.1557/jmr.1993.1875

Crossref journal-article

Springer Science and Business Media LLC

Journal of Materials Research (297)

Abstract

Carbon aerogels are a special class of low-density microcellular foams. These materials are composed of interconnected carbon particles with diameters of approximately 10 nm. The temperature dependence of the dc electrical resistivity and magnetic susceptibility (χ) from 4 K to room temperature, magnetoresistance (MR) in a magnetic field up to 15 T, and Raman scattering were measured as a function of aerogel density. While Raman scattering measurements are not sensitive to variations in density, the χ data show that there are more free carriers in samples of higher density. Aerogel samples with different densities all show a negative temperature coefficient of resistivity and a positive MR. The less dense samples exhibit a stronger temperature dependence of resistivity and a stronger field dependence of the MR, indicating that with decreasing density and increasing porosity, charge carriers are more localized. Data analysis precludes variable-range hopping in favor of nearest-neighbor hopping and fluctuation-induced tunneling as the most likely conduction mechanisms for carbon aerogels.

Bibliography

Fung, A. W. P., Wang, Z. H., Lu, K., Dresselhaus, M. S., & Pekala, R. W. (1993). Characterization of carbon aerogels by transport measurements. Journal of Materials Research, 8(8), 1875â1885.

Authors 5

A.W.P. Fung (first)
Z.H. Wang (additional)
K. Lu (additional)
M.S. Dresselhaus (additional)
R.W. Pekala (additional)

References 38 Referenced 71

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Dates

Type	When
Created	17 years, 11 months ago (Sept. 27, 2007, 6:43 a.m.)
Deposited	2 years, 3 months ago (May 14, 2023, 3:38 a.m.)
Indexed	1 month ago (July 31, 2025, 11:47 p.m.)
Issued	32 years, 1 month ago (Aug. 1, 1993)
Published	32 years, 1 month ago (Aug. 1, 1993)
Published Online	14 years, 7 months ago (Jan. 31, 2011)
Published Print	32 years, 1 month ago (Aug. 1, 1993)

Funders 0

None

BibTeX

@article{Fung_1993, title={Characterization of carbon aerogels by transport measurements}, volume={8}, ISSN={2044-5326}, url={http://dx.doi.org/10.1557/jmr.1993.1875}, DOI={10.1557/jmr.1993.1875}, number={8}, journal={Journal of Materials Research}, publisher={Springer Science and Business Media LLC}, author={Fung, A.W.P. and Wang, Z.H. and Lu, K. and Dresselhaus, M.S. and Pekala, R.W.}, year={1993}, month=aug, pages={1875–1885} }

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