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Hollow NiO–SnO 2 nanospheres have been fabricated via a simple one-pot template-free method. The synthesis is based on solvothermal treatment of stannate and nickel nitrate as the precursor in a mixed solvent of heptane–ethanol. The hollow nanospheres show diameters of about 200–300nm with the wall thickness of about 50nm, and the shell consists of numerous small nanoparticles. The gas sensor...
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