Co掺杂浓度对ZnO纳米棒结构和光学性能影响研究
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摘要
采用水热法以不同浓度Co掺杂合成了具有六方纤锌矿结构的ZnO纳米粉体,通过X-射线衍射(XRD)、扫描电镜(SEM)、拉曼光谱、X射线光电子光能谱分析法(XPS)、(光致发光) PL谱等分别对样品的形貌、结构、光学性能进行了测试和表征。结果表明:随着Co掺杂浓度的增大,纤锌矿ZnO的晶体结构没有改变,且Co以二价离子Co2+的形式掺杂进入ZnO晶格;同时花状ZnO纳米棒的均匀性变差,不同浓度Co掺杂ZnO纳米棒中均出现了少量且尺寸较小的单根纳米棒。PL光谱显示:随着Co掺杂浓度增大,样品的紫外发光峰没有明显地变化,而可见发光峰的强度先减小再增大,说明样品的缺陷先降低再提高。当Co掺杂的浓度为2. 0%时,所制备的ZnO花状纳米棒可见发光峰相对最低,其具有较小的缺陷。
ZnO nanopowders with hexagonal wurtzite structure were synthesized by hydrothermal method with different concentrations of Co. The morphology,structure and optical properties of the samples were tested and characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM),Raman spectroscopy,X-ray photo-electron spectroscopy( XPS),and photo luminescence( PL). The results show that the crystal structure of wurtzite ZnO does not change with the increase of Co doping concentration,and Co is doped into the ZnO crystal lattice in the form of divalent ions Co2 +. At the same time,the uniformity of the flower-like ZnO nanorods deteriorates. A small number of small nanorods with small size appeared in different concentrations of Co-doped ZnO nanorods. The PL spectrum shows that as the Co doping concentration increases,the UV luminescence peak of the sample does not change significantly,and the intensity of the luminescence peak decreases first and then increases,indicating that the defect of the sample decreases first and then increases. When the concentration of Co doping is 2. 0%,the prepared ZnO flower-like nanorods have a relatively low visible luminescence peak,which has a small defect.
ZnO nanopowders with hexagonal wurtzite structure were synthesized by hydrothermal method with different concentrations of Co. The morphology,structure and optical properties of the samples were tested and characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM),Raman spectroscopy,X-ray photo-electron spectroscopy( XPS),and photo luminescence( PL). The results show that the crystal structure of wurtzite ZnO does not change with the increase of Co doping concentration,and Co is doped into the ZnO crystal lattice in the form of divalent ions Co2 +. At the same time,the uniformity of the flower-like ZnO nanorods deteriorates. A small number of small nanorods with small size appeared in different concentrations of Co-doped ZnO nanorods. The PL spectrum shows that as the Co doping concentration increases,the UV luminescence peak of the sample does not change significantly,and the intensity of the luminescence peak decreases first and then increases,indicating that the defect of the sample decreases first and then increases. When the concentration of Co doping is 2. 0%,the prepared ZnO flower-like nanorods have a relatively low visible luminescence peak,which has a small defect.
引文
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[24] Guo S,Jiang H. The influence of Co content on the luminescence properties of Co-doped ZnO nanoparticles[J]. Journal of Aerosol Science,2018,33(8):1201-1216.
[2] Zhang Z Y,Lv Y Y,Yan J F,et al. Uniform ZnO Nanowire Arrays:Hydrothermal Synthesis,Formation Mechanism and Field Emission Performance[J]. Journal of Alloys&Compounds,2015,650:374-380.
[3] Mi-Jin Jin,Junhyeon Jo,Ji-Hee Kim,et al. Effects of Ti O2Interfacial Atomic Layers on Device Performances and Exciton Dynamics in ZnO Nanorod Polymer Solar Cells[J]. Acs Applied Materials&Interfaces,2014,6(14):11649-11656.
[4] Chu D,Masuda Y,Ohji T,et al. Formation and Photocatalytic Application of ZnO Nanotubes Using Aqueous Solution[J]. Langmuir the Acs Journal of Surfaces&Colloids,2010,26(4):2811-2815.
[5] Yun C P,Kim Y H,Nahm H H,et al. Inversion Domain Boundaries on Tin(Sn)-doped ZnO Nanobelts:Aberration-Corrected Scanning Transmission Electron Microscopy Study[J]. Applied Physics Letters,2013,102(3):033103-033105.
[6]Tan S T,Umar A A,Salleh M M.(001)-Faceted Hexagonal ZnO Nanoplate Thin Film Synthesis and the Heterogeneous Catalytic Reduction of 4-nitrophenol Characterization[J]. Journal of Alloys&Compounds,2015,650:299-304.
[7] UEDA K,TABATA H,KAWAI T. Magnetic and Electric Properties of Transition-metal-doped ZnO Films[J]. Applied Physics Letters,2001,79(7):988-990.
[8]杭联茂,张志勇. Co掺杂棒状ZnO的水热法合成及其磁性研究[J].材料导报,2014,28(20):31-33.
[9]张丽,徐明,余飞,等. Fe,Co共掺杂ZnO薄膜结构及发光特性研究[J].物理学报,2013,62(2):27501-027501.
[10] Lv Y Y,Zhang Z Y,Yan J F,et al. Growth Mechanism and Photoluminescence Property of Hydrothermal Oriented ZnO Nanostructures Evolving from Nanorods to Nanoplates[J]. Journal of Alloys and Compounds,2017,718:161-169.
[11] Muthukumar S,Gorla C R,Emanetoglu N W,et al. Control of Morphology and Orientation of ZnO Thin films Grown on SiO2/Si substrates[J].Journal of Crystal Growth,2001,225(2-4):197-201.
[12] Mahmood K,Park S,Sung H. Enhanced Photoluminescence,Raman Spectra and Field-emission Behavior of Indium-doped ZnO nanostructures[J]. Journal of Materials Chemistry C,2013,1(18):3138-3149.
[13] Xu Z Q,Deng H,Li Y,et al. Characteristics of A1-dopedc-axis Orientation ZnO Thin Films Prepared by the Sol-Gel method[J]. Materials Research Bulletin,2006,41(2):354.
[14] Youssef S,Combette P,Podlecki J,et al. Structural and Optical Characterization of Zn O Thin Films Deposited by Reactive rf Magnetron Sputtering[J]. Crystal Growth&Design,2009,9(2):1088-1094.
[15] Mallick A,Kole A,Ghosh T,et al. Zinc Aluminate Spinel Impurity Phase in Al doped ZnO Ceramic Target and Pulsed laser Ablated Films:Curse or Blessing[J]. Solar Energy,2014,108:80-87.
[16] Lv Y Y,Zhang Z Y,Yan J F,et al. Al Doping Influences on Fabricating ZnO Nanowire Arrays:Enhanced Field Emission Property[J]. Ceramics International,2018,44:7454-7460.
[17] Shabannia R. High-sensitivity UV Photodetector Based on Oblique and Vertical Co-doped Zn O Nanorods[J]. Materials Letters,2018,214:254-256.
[18] Zhang R,Yin P G,Wang N,et al. Photoluminescence and Raman scattering of ZnO nanorods[J]. Solid State Sciences,2009,11(4):865-869.
[19] Dhara S,Giri P K. Improved Fast Photoresponse from Al Doped ZnO Nanowires Network Decorated with Au nanoparticles[J]. Chemical Physics Letters,2012,54139-43.
[20]李惠,汪雯,江国顺. PLD法制备钴掺杂的氧化锌薄膜及其生长形貌和光学性能[J].光谱实验室,2008,25(4):742-747.
[21] Lv Y Y,Zhang Z Y,Yan J F,et al. Photoluminescence and Growth Mechanism of Oriented Hierarchical Fibrous-like ZnO Nanowires[J]. Journal of Nanoscience and Nanotechnology,2017,17:656-660.
[22] Huang L,Hao Y,Hu M. Optical and Magnetic Properties of Co-doped ZnO Synthesized by Magnetic Assisted Hydrothermal method[J]. Materials Science in Semiconductor Processing,2018,74:303-308.
[23]王金香,沈洪雪,彭小波,等. N掺杂ZnO薄膜的荧光特性研究[J].光子学报,2012,41(8):932-935.
[24] Guo S,Jiang H. The influence of Co content on the luminescence properties of Co-doped ZnO nanoparticles[J]. Journal of Aerosol Science,2018,33(8):1201-1216.