“…Due to its outstanding piezoelectric characteristics, excellent electronic transport and optical features, superior optical gain behavior, biocompatibility, chemical stability and so on, ZnO (wide bandgap of 3.37 eV, and large exciton binding energy of 60 meV) has been widely used in versatile applications, for instance high-efficiency photonic devices and short-wavelength optoelectronic devices (e.g., ultraviolet light-emitting diodes, laser diodes, and ultraviolet-blind photodetectors). [1][2][3][4][5] Within the comprehensive investigations of ZnO, there is increasing interest in nano/microstructures, which have already demonstrated their incomparable utility as eld effect transistors, optically and electrically pumped lasers, photodetectors, batteries, and chemical and biological sensors. [6][7][8] For the past few years, great efforts have also been devoted to preparing lowdimensional ZnO nano/microstructures, such as by metalorganic chemical vapor deposition, thermal evaporation, chemical vapor transport, laser ablation, and so on.…”