Figure 2.

(A) ${}^n{C}_{11}$ alkyl-capped SiQDs as a toluene sol and (B) after evaporation of the toluene; both photographs taken under illumination with an Hg lamp ($\lambda =365$ nm) to show the orange fluorescence. (C) The porous silicon, an approximately circular, brown–yellow area formed on the top of the silicon chip. (D) A fluorescent image of porous silicon under UV-lamp (Hg, $\lambda =365$ nm).