Figure 2

XRD diffraction patterns, Raman spectrum and SEM images of LVP (a–c) and NVP (a′–c′), the inserts of c and c′ is the low amplification images.
XRD diffraction patterns, Raman spectrum and SEM images of LVP (a–c) and NVP (a′–c′), the inserts of c and c′ is the low amplification images.