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 Yanming2, †, 
, Tang Chengchun1, ‡,
, Tang Chengchun1, ‡, SEM and TEM images of the samples obtained at different temperatures: (a), (d), and (g) SEM, temperature in the ranges of 800–850 °C, 900–950 °C, and 1000–1050 °C, the washed samples; (b) and (c) TEM, temperature in the range of 800–850 °C, the unwashed and washed samples; (e) and (f) TEM, temperature in the range of 900–950 °C, the washed samples; (h) TEM, temperature in the range of 1000–1050 °C, the washed samples; (i) SEM, the unwashed samples obtained at 1100 °C.
