Abstract
Boron nitride (BN) cages were synthesized by annealing Fe 4N and B powders at 1000 °C for 1 h in nitrogen gas atmosphere. To remove non-BN clusters such as metal catalyst particles, purification of BN cages was carried out by acid treatment and centrifugation. Large amounts of BN cages were observed by high-resolution electron microscopy and energy-dispersive X-ray spectroscopy, and the cages showed photoluminescence peak at ∼3.8 eV.
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