Fig. 8

XRD and PL characterization of BA tubes, (BA)0.72(BN)0.28 helices, and BA@(BA)x(BN)1-x core-shell structures. a XRD patterns of BA tubes, (BA)0.72(BN)0.28, and BA@(BA)x(BN)1-x core-shell structures obtained by mixing BA tubes with 2 mL of a saturated supernatant of (BA)0.72(BN)0.28 alloy helices. The dashed lines represent the peaks of (BA)x(BN)1-x shell. b The corresponding PL spectra when excited by 480 nm