Hexagonal boron nitride hollow capsules with collapsed surfaces: Chemical vapor deposition with single-source precursor ammonium fluoroborate

Li Xiaopeng¹, Zhang Jun¹, Yu Chao¹, Liu Xiaoxi¹, Abbas Saleem¹, Li Jie¹, Xue Yanming^{2, †,}, Tang Chengchun^{1, ‡,}

SEM images of (a) SBA-15 and (b)–(d) the samples obtained after NH₄BF₄ CVD reaction.