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(a) HRTEM image of S@SWCNT. The two lines correspond to 1D sulphur chains encapsulated inside a SWCNT. (b) HRTEM image of S@DWCNT with the 1D sulphur chain in zigzag conformation. (c) A 1D linear chain inside a DWCNT. Scale bar, 2 nm. (d) XRD profiles of S@SWCNTs, empty SWCNTs, S@DWCNTs and empty DWCNTs. Arrows indicate the Bragg peaks of 1D sulphur chains.
