| SHI Yong-liang,CHEN Cun-guang,GUO Zhi-meng.Preparation and Infrared Reflection Properties of Co2+ Doped ZnO Thin Films[J],49(11):184-190 |
| Preparation and Infrared Reflection Properties of Co2+ Doped ZnO Thin Films |
| Received:October 22, 2019 Revised:January 06, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.11.020 |
| KeyWord:sol-gel method infrared reflectivity Co2+doped ZnO films |
| Author | Institution |
| SHI Yong-liang |
Department of Materials Engineering, Hebei College of Industry and Technology, Shijiazhuang , China |
| CHEN Cun-guang |
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
| GUO Zhi-meng |
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
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| Abstract: |
| The work aims to improve the infrared reflectance of the infrared reflective layer in the vacuum insulation pipeline. ZnO sol doped with different amounts of Co (Zn1–xCoxO, x=0, 0.02, 0.04, 0.06, 0.08, 0.10) were prepared by sol-gel method with cobalt acetate tetrahydrate and zinc acetate dihydrate as metal ion sources. Furthermore, the thin film was prepared on the surface of mirror 316L stainless steel by dipping-coating method, and the final sample was obtained after annealing at 450 ℃ for 3 hours. Thermogravimetric-differential scanning calorimetric (TG-DSC) analysis was used to characterize the drying and crystallization process of Zn1–xCoxO gel during heating treatment. X-ray diffraction (XRD) was used to analyze the phase composition of films with different Co doping amounts. Field emission scanning electron microscope (FE-SEM) was used to observe the microscopic morphology of the film surface. Energy dispersive spectrometer (EDS) was used to analyze the element distribution of the film surface after thermal treatment. UV-Vis-NIR spectrophotometer was used to analyze the infrared reflection performance of the films. The obtained Zn1–xCox sol spread well on the substrate surface, and the crystalline grains were uniformly distributed to form the dense surface after thermal treatment. With the Zn1–xCoxO film, the infrared reflectance of the sample was significantly improved from 0.6355 to the optimum value of 0.8131 (where x=0.06). At the same time, the XRD results showed that the doped sample still maintained a stable hexagonal wurtzite structure. However, with the increase of Co doped amount, the (101) crystal plane showed a preferential orientation. In addition, after aerobic heat treatment at 400 ℃ for 28 days, the sample still maintained a high reflectance of 0.8018. With Zn1–xCoxO film, the infrared reflectance of the reflective layer can be effectively improved, and the internal metallic matrix can also be well protected, thereby the heat insulation performance and service life of the vacuum insulation pipeline are expected to be improved. |
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