Figure 1

SEM images, XRD patterns, and UV–vis absorption spectra of ZnO, ZnO-H, and ZnO-A. SEM images of ( a ) ZnO, ( b ) ZnO-H, and ( c ) ZnO-A. XRD patterns ( d ) and UV–vis absorption spectra ( e ) of ZnO, ZnO-H, and ZnO-A.