The rice used in the current study was harvested from the suburbs
of Daejeon in the Republic of Korea during September
2012. Characterization by optical microscopy reveals the morphology
of RHs: The inner RH epidermis has a smooth surface,
whereas the outer epidermis has a rough surface with repeated
ridges (Fig. 1B, Upper Inset, and Fig. 1C). An elemental mapping
analysis using energy dispersive spectroscopy (EDS) indicates
that the silica is mainly concentrated at the tips of the outer
surface (Fig. 1C, Lower Inset and Fig. S1). A more microscopic
characterization of the concentrated silica region using scanning
electron microscopy (SEM) showed that, in natural RHs, silica
exists in the form of nanoparticles that are interconnected to
constitute a porous structure (Fig. S1B). As summarized in Fig.
1D, during the overall synthetic procedure, the original RHs
were first pretreated to extract high-purity silica, which was then
reduced to generate the final Si. The detailed synthetic step and
its yield are summarized in Fig. S2.
The rice used in the current study was harvested from the suburbs
of Daejeon in the Republic of Korea during September
2012. Characterization by optical microscopy reveals the morphology
of RHs: The inner RH epidermis has a smooth surface,
whereas the outer epidermis has a rough surface with repeated
ridges (Fig. 1B, Upper Inset, and Fig. 1C). An elemental mapping
analysis using energy dispersive spectroscopy (EDS) indicates
that the silica is mainly concentrated at the tips of the outer
surface (Fig. 1C, Lower Inset and Fig. S1). A more microscopic
characterization of the concentrated silica region using scanning
electron microscopy (SEM) showed that, in natural RHs, silica
exists in the form of nanoparticles that are interconnected to
constitute a porous structure (Fig. S1B). As summarized in Fig.
1D, during the overall synthetic procedure, the original RHs
were first pretreated to extract high-purity silica, which was then
reduced to generate the final Si. The detailed synthetic step and
its yield are summarized in Fig. S2.
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