ZnO/TiO_(2)核-壳纳米结构的低温制备及其光电性能研究  

Low-temperature preparation of ZnO/TiO_(2)core-shellnanostructures and their optoelectronic properties

作　　者：李丽华[1] 王贺 王航 黄金亮[1] LI Lihua;WANG He;WANG Hang;HUANG Jinliang(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023

出　　处：《功能材料》2024年第1期1217-1222,共6页Journal of Functional Materials

基　　金：高端外国专家项目(GDW2017410125)。

摘　　要：ZnO因其自身的高电荷复合、化学性质活泼,导致其应用受到限制,通过表面修饰进行复合可实现电子-空穴的分离并提高其化学稳定性。以二水合醋酸锌、六水合硝酸锌、六氟钛酸铵为原料,采用溶胶-凝胶、水热和液相沉积相结合的方法,在低温条件下制备出ZnO/TiO_(2)单异质结。采用XRD、SEM、EDS、TEM、PL等对样品进行表征并对其光电性能进行测试。结果表明,在沉积时间为20 min时,ZnO/TiO_(2)核-壳结构形貌最规整,其中ZnO直径约115 nm,TiO_(2)薄膜厚度约7.6 nm;TiO_(2)的负载,降低了电极中光生电荷的复合,提高了ZnO对光子的收集能力,光电流密度提升大约10倍,达到0.21μA/cm^(2),表现出优异的光电化学性能。ZnO is limited in its application due to its own high charge complex and active chemical nature.Compounding by surface modification can realize electron-hole separation and improve its chemical stability.In this paper,ZnO/TiO_(2) 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 materials under low temperature conditions.XRD,SEM,EDS,TEM and PL were used to characterize the samples and test their optoelectronic properties.The results show that the morphology of ZnO/TiO_(2) 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 TiO_(2) film is about 7.6 nm.The loading of TiO_(2),which reduces the photogenerated charge complex in the electrode and improves the collection of photons by ZnO,and the photocurrent density is enhanced by about 10 times to reach 0.21μA/cm^(2),which exhibiting excellent photoelectrochemical performance.

关 键 词：ZnO/TiO_(2) 核-壳结构 异质结 光电极材料 液相沉积 

分 类 号：TM23[一般工业技术—材料科学与工程] O649[电气工程—电工理论与新技术]