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Core/shell structure with colloidal carbonaceous microspheres as core and nanowhisker-like Ni(OH)2as shell was synthesized by a facile precipitation method. NiO hollow spheres with hierarchical nanostructure and amorphous carbon/nickel nanoparticles composites were obtained by heat treatment in air and nitrogen, respectively. Nitrogen adsorption and desorption analysis indicated that these two novel products are both nanoporous materials with high specific surface area and large pore volume.

Single-crystalline gold nanorods have been prepared by one-step, seedless solvothermal reduction of HAuCl4·4H2O in cetyltrimethylammonium bromide (CTAB)/octane + butanol/formamide microemulsions. Formamide provides not only reduction but also sites occupied by Au3+ion through replacing “water pools” in the traditional microemulsions.