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HR-TEM room-temperature images of BNNTs: (a) a relatively large field of view, with several BNNTs, partially overlapping; (b) a very high-resolution image of a multiwalled BNNT. The fine arrow points to a B–N pairs, making up the walls; a thick arrow indicates discontinuity of the inner wall; arrowheads point to debris covering part of this tube section. Bars correspond to (a) 10 nm and (b) 5 nm.
