Fig. 6 BBFs containing different nanomaterials. (a) DF optical image
of aligned SWNTs in a SWNT-BBF. Scale bar: 10 mm, and 2 mm (inset).
(b) DF optical image taken from a MWNT-BBF showing aligned
MWNTs. Scale bar: 20 mm. Inset, DF optical image showing curled
MWNTs in solution before bubble expansion. Scale bar: 20 mm. (c)
Confocal microscopy image of fluorescent CdS NWs embedded in
a BBF. Scale bar: 50 mm, and 10 mm (inset). Adapted from Ref. 27.