Effects of high-temperature rapid thermal annealing for seed layers on the crystallographic evolution in hydrothermal ZnO nanostructures |
| |
Institution: | 1. Department of Physics, Faculty of Science, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;2. College of Advanced Manufacturing Innovation, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;1. Departamento de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-088, Hermosillo, Sonora, CP. 83000;2. Posgrado de Nanotecnología, Departamento de Física, Universidad de Sonora, Apdo. Postal 1626, Hermosillo, Sonora, CP. 83000 Mexico;3. Departamento de Física, Universidad de Sonora, Apdo. Postal 1626, Hermosillo, Sonora, CP. 83000;4. Centro de Investigación y Estudios Avanzados del IPN, Unidad Querétaro, Apdo. Postal 1-798, Querétaro, Qro., C.P. 76001 Mexico |
| |
Abstract: | In this work, we investigated effects of high temperature rapid thermal annealing for the zinc oxide (ZnO) seed layers on the growth morphology and crystal orientation of hydrothermal ZnO nanorods (NRs). The seed layers were prepared by sol–gel spin coating and annealed by two-step rapid thermal processes at different peak temperatures ranging from 600 to 900 °C for a short time period of 1 min. The seed layers annealed in a temperature range of 600–800 °C were all polycrystalline; however, they exhibited a highly Zn-deficient amorphous state when annealed at 900 °C as observed by X-ray photoelectron spectroscopy, X-ray diffraction (XRD), and cross-sectional transmission electron microscopy (TEM). The vertical NRs normal to the substrate were grown along 001] direction atop the polycrystalline seeds annealed at 600–800 °C, whereas different growth morphology of flower-like NRs was observed on the seeds annealed at 900 °C with the strongest XRD peak along the 100] orientation. From our cross-sectional TEM analysis, this flower-like architecture was initiated from the pioneer crystals laterally grown along 001] direction guiding the subsequent growth of petal NRs oriented by a slight difference in growth direction. |
| |
Keywords: | ZnO seed layer Nanorods Rapid thermal annealing Hydrothermal growth Crystal orientation Flower-like morphology Pioneer crystal |
本文献已被 ScienceDirect 等数据库收录! |
|