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Title
Synthesis of Nickel Sulfide Submicrometer-Sized Hollow Spheres Using a γ-Irradiation Route (This work was financially supported by the grants of Department of Basic Research, Ministry of Science and Technology, P.R. China, the Grants-in-aid for the special projects of significant basic research (2003CCA03700), and also the Open Foundation of Structure Research Laboratory of USTC. We gratefully acknowledge help from Prof. Shunyuan Zhang with EDX and HRTEM measurements.)