Low-temperature preparation of ZnO/TiO2 core-shell nanostructures and their optoelectronic properties
ZnO is limited in its application due to its own high charge complex and active chemical nature.Com-pounding by surface modification can realize electron-hole separation and improve its chemical stability.In this paper,ZnO/TiO2 single heterojunctions were prepared by combining sol-gel,hydrothermal and liquid phase deposition with zinc acetate dihydrate,zinc nitrate hexahydrate,and ammonium hexafluorotitanate as raw ma-terials under low temperature conditions.XRD,SEM,EDS,TEM and PL were used to characterize the sam-ples and test their optoelectronic properties.The results show that the morphology of ZnO/TiO2 core-shell structure is the most regular at the deposition time of 20 min,in which the diameter of ZnO is about 115 nm,and the thickness of TiO2 film is about 7.6 nm.The loading of TiO2,which reduces the photogenerated charge complex in the electrode and improves the collection of photons by ZnO,and the photocurrent density is en-hanced by about 10 times to reach 0.21 μA/cm2,which exhibiting excellent photoelectrochemical performance.
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