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ZnSe hollow nanospheres have been hydrothermally synthesized at 140 °C for 24 h starting from the precursor ZnCl 2 (N 2 H 4 ) 2 and Na 2 SeO 3 by using hydrazine hydrate (N 2 H 4 ·H 2 O) as the reducing agent. The sample was characterized by XRD, ICP-AES, FE-SEM, and TEM. The BET surface area of the obtained ZnSe hollow nanospheres is 77.13 m 2 g −1 . Both the transverse optic (TO) and longitudinal optic (LO) phonon peaks in Raman spectra of the ZnSe product showed a obvious shift to lower frequency compared to bulk values; a blue-shift ( ) was observed in PL spectra. It appears that the hollow spheres might be formed by a soft-template of gas bubbles of N 2 produced during the reaction.
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Jiang et al. (2005) studied this question.
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