Figure 1 | A possibly low-cost, ene

Figure 1 | A possibly low-cost, energy-efficient, green, and large scale production of nano-Si from RHs. a, Comparison between existing methods46 and
our new method (highlighted with red color) for producing nano-Si. Si(OR)4 denotes silicon alkoxide. b, A panicle of ripe rice at a rice farm in China
(photographed by Huo, K.). c, Flow chart of the process for recovering SiNPs from RHs. R.T. denotes room temperature. d–g, Optical images of the
intermediate substances. The inset of (f) shows an optical microscopy image (0.9 mm 3 0.6 mm) of one piece of heat treated RH.