Facile Growth of Porous Hierarchical Structure of ZnO Nanosheets on Alumina Particles via Heterogeneous Precipitation
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2013年第10期
论文作者：Hamid Tajizadegan Majid Jafari Mehdi Rashidzadeh Reza Ebrahimi-Kahrizsangi Omid Torabi
文章页码：915 - 918
摘 要：ZnO nanosheets and nanoflakes were grown on alumina particles in the absence of surfactants via heterogeneous precipitation using urea,zinc acetate and bayerite as precursors.Thermo-gravimetric analysis（TGA）,X-ray diffraction（XRD） and Fourier transform infrared spectroscopy（FTIR） were used and the results indicated the formation of only two phases: wurtzite-type ZnO and g-Al2O3.ZnO nanoflakes were grown on alumina particles in the samples with ZnO content of 40 and 60 wt%.By increasing the ZnO content to80 wt%,a porous hierarchical structure of ZnO with nanosheet arrays appeared.Both of these nanoflakes and nanosheets were about 40e80 nm in thickness and about 1e2 mm in diameter.It was proposed that Zn5（CO3）2（OH）6nuclei undergo higher growth rates in thin sheets at edges of bayerite particles with a higher surface energy.The BrunauereEmmetteTeller（BET） measurements proved a reachable high surface area for hierarchical structures of ZnO nanosheets,which could mainly be attributed to their unique growth on alumina particles.Also,UV absorption results revealed that ZnOeAl2O3compositions still show the UV characteristic absorption of ZnO,which can evidence the presence of photocatalytic properties in ZnOeAl2O3compositions.
Hamid Tajizadegan1，Majid Jafari1，Mehdi Rashidzadeh2，Reza Ebrahimi-Kahrizsangi1，Omid Torabi1
1. Department of Materials Engineering,Najafabad Branch,Islamic Azad University2. Catalysis & Nanotechnology Research Division,Research Institute of Petroleum Industry (RIPI)
摘 要：ZnO nanosheets and nanoflakes were grown on alumina particles in the absence of surfactants via heterogeneous precipitation using urea,zinc acetate and bayerite as precursors.Thermo-gravimetric analysis（TGA）,X-ray diffraction（XRD） and Fourier transform infrared spectroscopy（FTIR） were used and the results indicated the formation of only two phases: wurtzite-type ZnO and g-Al2O3.ZnO nanoflakes were grown on alumina particles in the samples with ZnO content of 40 and 60 wt%.By increasing the ZnO content to80 wt%,a porous hierarchical structure of ZnO with nanosheet arrays appeared.Both of these nanoflakes and nanosheets were about 40e80 nm in thickness and about 1e2 mm in diameter.It was proposed that Zn5（CO3）2（OH）6nuclei undergo higher growth rates in thin sheets at edges of bayerite particles with a higher surface energy.The BrunauereEmmetteTeller（BET） measurements proved a reachable high surface area for hierarchical structures of ZnO nanosheets,which could mainly be attributed to their unique growth on alumina particles.Also,UV absorption results revealed that ZnOeAl2O3compositions still show the UV characteristic absorption of ZnO,which can evidence the presence of photocatalytic properties in ZnOeAl2O3compositions.
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