A study on morphology control and optical properties of ZnO nanorods synthesized by microwave heating |
| |
Authors: | MK Tsai CC Huang YC Lee CS Yang HC Yu JW Lee SY Hu CH Chen |
| |
Institution: | 1. Department of Electronic Engineering and Research Center for Micro/Nano Technology, Tungnan University, Taipei, Taiwan;2. Graduate Institute of Electro-optical Engineering, Tatung University, Taipei, Taiwan;3. Department of Materials Engineering, Ming Chi University of Technology, Taipei, Taiwan;4. Department of Electrical Engineering, Tung Fang Design University, Kaohsiung, Taiwan;5. Protrustech Corporation Limited, Tainan, Taiwan |
| |
Abstract: | In this study, we present morphology control investigations on zinc oxide (ZnO) nanorods synthesized by microwave heating of a mixture of zinc nitrate hexahydrate and hexamethylenetetramine (HMTA) precursors in deionized water (DI water). To study the morphology and structural variations of the obtained ZnO nanorods in different molar ratio of zinc nitrate hexahydrate to HMTA, X-ray diffraction (XRD), scanning electron microscopy (SEM) images, Raman scattering, and photoluminescence (PL) spectroscopy were measured. XRD and SEM images are utilized to examine the crystalline quality as well as the morphological properties of the ZnO nanorods. It is found that morphology control can be achieved by simply adjusting the reactant concentrations and the molar ratio of zinc nitrate hexahydrate to HMTA. Raman scattering and PL spectroscopy measurements were demonstrated to study the size- and shape-dependent optical response of the ZnO nanorods. The Raman scattering result shows that the intensity of LO mode at around 576 cm?1 decreases with the increase in the molar ratio of zinc nitrate hexahydrate to HMTA, indicating the reduction of defect concentrations in the synthesized ZnO nanorods. Room temperature PL spectrum of the synthesized ZnO nanorods reveals an ultraviolet (UV) emission peak and a broad visible emission. An enhancement of UV emission appears in the PL spectra as the molar ratio of zinc nitrate hexahydrate to HMTA increases, indicating that the defect concentration of the synthesized ZnO nanorods can be reduced by increasing the molar ratio. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|