Study On The Growth Of ZnO Nanorods On The LB Substrate

ZnO with hexagonal structure is an important wide band-gap oxide semiconductorwhich has a band-gap of 3.37eV, and a large exciton binging energy of 60meV at roomtemperature. Some semiconductors can be integrated with it easily to form applicablematerials . One-dimensional nanostructure ZnO materials which growth on substrate inorder can be applied in such fields of surface acoustic wave device, transparentelectrodes, short wave lase et al. ZnO nanorods has the ability of ultraviolet lasing atroom temperature. Especially, it was found that the nanorods of ZnO have the ability ofultraviolet lasing at room temperature, which promotes the study of the growth of ZnOnanorods with high quality and preferred orientation grow on the base of substance.Stearic acid/Zn²⁺ composite films has be prepared by Langmuir-Blodgett(LB)technology and then with the coefficients of solution concentration of 0.10mol·L^-1, thebarrier speed of 5mm·min^-1, still time between 10³0min, spreading volume of 80μL,transferring pressure of 28mN·m^-132mN·m^-1, substrate speed of4mm·min^-16mm·min^-1. The result of XRD spectrums shows the peaks of stearicacid/Zn²⁺ composite LB films with low crystallinity are not typical characteristicdiffraction peaks of standard ZnO. But the films change into ZnO crystal films withhexagonal structure and high crystallinity after being calcined at temperature of 550℃.The observation of SEM results indicate that the ZnO LB films is smooth, rules, anduniform. It can be seen from the UV-Vis results, ZnO nanofilms has two peaks around266nm and 360nm, separate. The absorption intensity desn't change obvious when thelayers of films has little change. It means between the membrane and the membrane isuniform.Taking the ZnO films prepared by LB technique as seed layer, the ZnO nanorodsare grown on it by solution method. And the influence of the layers of seeds films ,heating environment, growth temperature, growth time and growth concentration on thepreparation of ZnO nanorods are discussed. XRD detection results reveal that the ZnOnanorods are preferred-oriented in (002) planes with wurtzite structure and highcrystallinity. The ZnO nanorods, which are highly oriented and stable size in narrowdiameter distribution can be made by adjusting the experimental parameters. UV-Vistransmission spectras shows the construction of nanorods is important to ZnO opticalproperties. ZnO nanorods is in good orientation and small roughness can lead to hightransmittance. Ordered structure of nanorods can improve the optical properties of ZnOeffectively.