Mn-doped ZnO rod arrays were successfully prepared on zinc substrate by a simple aqueous solution method. X-Ray diffraction and high resolution transmission electron microscopy results indicate the doped Mn 2+ has successfully incorporated into the ZnO crystal lattice. The optical, magnetic and electrical properties of as-prepared ZnO rod arrays were all changed due to Mn 2+ doping into ZnO rods. Photoluminescence spectra at room temperature suggest that the band gap increases with increasing the Mn concentrations in ZnO rods. The M-H curves of all Mn-doped ZnO rod arrays show obvious ferromagnetic characteristics at room temperature. The current-voltage characteristic curves of Mn-doped ZnO rod arrays indicate that the samples are typical semiconductors.

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Zn-ferrite film with hierachical structure and organic composite was prepared by the coprecipitation method, which has good ferromagnetism and photoluminescence (PL) properties. DMSA-modified Fe 3 O 4 nanoparticles (NPs) with saturation magnetization of 55.6 emu/g were prepared by the one-step process, and bovine serum albumin (BSA) with different concentrations was bound on NPs by the carbodiimide method. After Fe 3 O 4 -BSA NPs had been adsorbed onto Zn-ferrite film by magnetic forces, the PL intensity of the films was seen to increase linearly with BSA concentration in the range of 0.25-1.5 mg/mL, suggesting that the films could be used for protein detection.

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In this work, a novel double layer made of ZnO nanorod arrays and TiO2 nanorod arrays with anticorrosion function were successfully prepared on fluorine-doped tin oxide (FTO) substrate by a simple low-temperature solvothermal method. As compared with the pure TiO2 and pure ZnO film, the combination of the two films presented higher photocathodic protection performance for 316 stainless steel (316 SS) and Q235 carbon steel in 3.5 wt% NaCl solution. The composite film with ZnO nanoparticles layer between ZnO nanorod arrays and TiO2 nanorod arrays exhibited the best photocathodic performance, which lowered the open circuit potential (OCP) of 316 SS and Q235 to −991 mV, −1066 mV, respectively. The results demonstrated that the formation of the uniform heterojunction film and the small difference in band alignment played important roles in the promotion of photocathodic protection performance.