Freestanding porous gold films with arrays of spherical pores or hollow spheres were fabricated photochemically. UV irradiation of a polystyrene-sphere (PS) colloidal crystal template floating on a solution containing HAuCl4 and Na2SO3 led to gold deposition, and then PS removal gave a spherical-pore array. Irradiating the shell/sphere structure upside-down on fresh precursor solution gave a hollow-sphere array after PS removal (see picture).
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Sun et al. (2006) studied this question.
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