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Electrical conductivity of cellular ceramic composites prepared from plant precursors
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Image of FIG. 1.
FIG. 1.

Preservation of cellular microstructural features of native bamboo plants in the pyrolyzed biocarbon preform [(a) and (b)] and cellular ceramic composite [(c) and (d)]; SEM/SE [(a) and (b)] and optical [, (c) and (d)] micrographs showing the multiplicity of hollow channels in transverse sections [(a) and (c)] and the retention of tubular elongated cell structures in longitudinal sections [(b) and (d)] relative to the direction of the growth axis of the native plants.

Image of FIG. 2.
FIG. 2.

XRD scan of cellular -bamboo showing the presence of Si and as the major crystalline phases.

Image of FIG. 3.
FIG. 3.

Fitting of experimentally observed vs patterns following different models: (a) simple small polaron transport, (b) 1D VRH, (c) 2D VRH, and (d) 3D-VRH. It is clear that as we proceed from small polaron to 3D-VRH model, the temperature range, over which the fitting is valid, expands which points out the relevance of 3D VRH model in explaining the electrical conduction in cellular composites both in directions longitudinal and transverse to the growth axis of the plant template.

Image of FIG. 4.
FIG. 4.

Variation of activation energy with temperature as estimated from Eq. (6).

Image of FIG. 5.
FIG. 5.

Temperature dependence of thermoelectric power of cellular ceramic composites synthesized from bamboos in directions parallel (a) and perpendicular (b) to the plant growth axis; variation in charge carrier concentration with thermoelectric power in directions parallel (c) and perpendicular (d) to the plant growth axis.

Image of FIG. 6.
FIG. 6.

(Color online) and XPS spectra for the longitudinal and transverse directions.


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Table I.

Characteristics of pyrolyzed bamboo and cellular -bamboo.

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Table II.

Different parameters associated with charge transport in cellular -bamboo, following 3D-VRH model.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electrical conductivity of cellular Si∕SiC ceramic composites prepared from plant precursors