MnFe<sub>2</sub>O<sub>4</sub>/还原氧化石墨烯纳米复合材料的光学性能

丁梅杰; 张旭东; 魏智强; 黄尚攀; 姜金龙

doi:10.13801/j.cnki.fhclxb.20191030.002

MnFe₂O₄/还原氧化石墨烯纳米复合材料的光学性能

doi: 10.13801/j.cnki.fhclxb.20191030.002

丁梅杰^{1, 2,},
张旭东^2,,
魏智强^{1, 2, ,},
黄尚攀^2,,
姜金龙^2,

1.
兰州理工大学　省部共建有色金属先进加工与再利用国家重点实验室，兰州 730050
2.
兰州理工大学　理学院，兰州 730050

基金项目: 国家自然科学基金(51261015)；甘肃省自然科学基金(1308RJZA238)；兰州理工大学红柳一流学科建设项目

详细信息

通讯作者:
魏智强，教授，博士生导师，研究方向为纳米材料　E-mail：zqwei7411@163.com

中图分类号: TB34
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- 被引次数: 0
出版历程
- 收稿日期: 2019-07-18
- 录用日期: 2019-09-24
- 网络出版日期: 2019-10-30
- 刊出日期: 2020-07-15

Optical properties of MnFe₂O₄/reduced graphene oxide nanocomposites

DING Meijie^{1, 2
,},
ZHANG Xudong^2
,,
WEI Zhiqiang^{1, 2
, ,},
HUANG Shangpan^2
,,
JIANG Jinlong^2
,

1.
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2.
College of Science, Lanzhou University of Technology, Lanzhou 730050, China

摘要

摘要: 由于纳米尺度的尖晶石结构金属氧化物独特的晶体结构和能带结构，使其具有广阔的应用前景。采用水热法合成了MnFe₂O₄复合还原氧化石墨烯(MnFe₂O₄/rGO)纳米复合材料，采用XRD、高分辨透射电子显微镜(HRTEM)、能量色散X射线光谱仪(EDX)、FTIR、XPS、拉曼光谱(Raman)、光致发光光谱(PL)和紫外-可见光谱漫反射(UV-vis DRS)对样品的晶体结构、形貌、元素分布、结合能和光学性能进行表征。结果表明，制备的MnFe₂O/rGO复合材料为立方尖晶石结构，形貌呈不规则的椭球形，颗粒大小比较均匀。rGO表面所负载的MnFe₂O₄纳米粒子被石墨烯部分包裹，颗粒尺寸小，分散性好。MnFe₂O₄/rGO复合材料的电子-空穴对的再结合效率降低，其中石墨烯具有较多缺陷，无序程度较高，含氧基团被聚乙烯吡咯烷酮(PVP)部分还原，数量大大减少。MnFe₂O₄/rGO复合材料的带隙小于纯MnFe₂O₄带隙，发生了红移现象。
- MnFe₂O₄ /
- 还原氧化石墨烯(rGO) /
- 微观结构 /
- 光学性能 /
- 金属氧化物 /
- 纳米复合材料
Abstract: The nanoscale spinel structure metal oxide possesses broad application prospect due to its unique crystal structure and band structure. The MnFe₂O₄/reduced graphene oxide (rGO) nanocomposites were synthesized by hydrothermal method, the crystal structure, morphology, element distribution, binding energy and optical properties were characterized by XRD, high-resolution transmission electron microscope (HRTEM), energy dispersive X-ray spectrometer (EDX), FTIR, XPS, Raman spectroscopy (Raman), photoluminescence spectroscopy (PL) and UV-vis diffuse reflection spectroscopy (UV-vis DRS). The results show that the MnFe₂O₄/rGO nanocomposites prepared by this method have cubic spinel structure. The morphology is irregular ellipsoid with uniform particle size. MnFe₂O₄ nanoparticles loaded on the surface of rGO are partially coated with graphene, possessing small particle size and good dispersion. The MnFe₂O₄/rGO nanocomposites exhibit lower recombination efficiency of electron-hole pairs. The graphene has more defects and higher disorder degree. The oxygen-containing groups are partially reduced by polyvinyl pyrrolidone (PVP), and the quantity is greatly reduced. The band gap of MnFe₂O₄/rGO composite is narrower than that of pure MnFe₂O₄, resulting in red shift.
- MnFe₂O₄ /
- reduced graphene oxide(rGO) /
- microstructure /
- optical performance /
- metal oxide /
- nanocomposite

HTML全文

图 1 氧化石墨烯(GO)、MnFe₂O₄和MnFe₂O₄/还原氧化石墨烯(rGO)复合材料的XRD图谱

Figure 1. XRD patterns of graphene oxide(GO), MnFe₂O₄ and MnFe₂O₄/reduced graphene oxide(rGO) composite

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图 2 纯MnFe₂O₄的HRTEM图像((a), (b))、选区电子衍射图像(c)和粒径分布(d)

Figure 2. HRTEM images((a), (b)), selected area electron diffraction image(c) and corresponding particle size distribution(d) of pure MnFe₂O₄

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图 3 rGO(a)和MnFe₂O₄/rGO复合材料(b)的HRTEM图像

Figure 3. HRTEM images of rGO(a) and MnFe₂O₄/rGO composite(b)

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图 4 MnFe₂O₄ (a)和MnFe₂O₄/rGO复合材料(b)的能量色散X射线(EDX)图谱

Figure 4. Energy dispersive X -ray (EDX) spectra of MnFe₂O₄(a) and MnFe₂O₄/RGO composite(b)

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图 5 GO、MnFe₂O₄和MnFe₂O₄/rGO复合材料的FTIR图谱

Figure 5. FTIR spectra of GO, MnFe₂O₄ and MnFe₂O₄/rGO composite

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图 6 MnFe₂O₄/rGO复合材料的拉曼图谱

Figure 6. Raman spectrum of MnFe₂O₄/rGO composite

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图 7 MnFe₂O₄/rGO复合材料的XPS图谱

Figure 7. XPS spectra of MnFe₂O₄/rGO composite

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图 8 MnFe₂O₄和MnFe₂O₄/rGO复合材料的光致发光(PL)图谱

Figure 8. Photoluminescence(PL) spectra of MnFe₂O₄ and MnFe₂O₄/rGO composite

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图 9 MnFe₂O₄和MnFe₂O₄/rGO复合材料的紫外-可见漫反射图谱(a)和 (αhν)²-hν曲线(b)

hν—photon energy; α—Absorption coefficient

Figure 9. UV-vis diffuse reflection spectroscopy(a) and (αhν)²-hν curves(b) of MnFe₂O₄ and MnFe₂O₄/rGO composite

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