Figure 2. SEM images of (a, b) ZMO; (c, d) ZMOP-4
As shown in Figure 3b-f , it is obvious that ZMOP-4 simultaneously contains the elements of Mn, O, N, and Zn, and they are evenly dispersed. The uniform distribution of the N element proves the successful addition of PPy.
To further determine the phase of PPy and ZMOP-x, XRD patterns of the materials were tested and analyzed. In Figure 4a , XRD results of ZMO and ZMOP-x nanowires show the diffraction peak corresponds to that of the standard card α-MnO2 (JCPDS44-0141), reflecting that the doping of a little bit of Zn2+won’t influence the original crystal structure of MnO2. These several main identifying peaks at 12.8, 18.1, 26.8, 37.5, 41.9, 49.8, and 60.3° equivalent to points to the (110), (200), (310), (211), (301), (411), and (521) crystalline planes of α-MnO2, respectively.20-22 PPy sample has a distinct broad peak at 25°, which corresponds to the (002) planes of graphite. Hence, The XRD data indicates that the as-prepared PPy exhibits an amorphous structure. In addition, due to the small content of PPy in the ZMOP-x composite, the peak of PPy is not very obvious in the obtained XRD pattern.