| Bi2O3/Cu-O-Cr核壳结构纳米复合物的合成 |
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| 引用本文： | 李卫,程化.Bi2O3/Cu-O-Cr核壳结构纳米复合物的合成[J].中南大学学报(自然科学版),2006,37(6):1019-1024. |
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| 作者姓名： | 李卫 程化 |
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| 作者单位： | 1. 中南大学,粉末冶金国家重点实验室,湖南,长沙,410083;中南大学,化学化工学院,湖南,长沙,410083;中南大学,材料科学与工程学院,湖南,长沙,410083
2. 中南大学,化学化工学院,湖南,长沙,410083 |
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| 基金项目： | 中南大学校科研和教改项目 |
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| 摘 要： | 采用沉淀法制得球形单分散Bi2O3纳米粒子；通过共沉淀法制备球形单分散Bi2O3／Cu-O-Cr核壳结构复合纳米材料,通过X射线衍射、透射电镜、能谱分析和红外光谱等技术表征所合成材料的成分组成、晶体结构、微现形貌以及颗粒尺寸，并对Bi2Oa／Cu-O-Cr核壳结构的复合纳米粒子的形成机理进行研究。研究结果表明：在包覆前先对Bi2O3粒子进行表面铵离子（NH4^＋）功能化是形成均匀核壳纳米结构的关键；铜铬包覆层以氨配合物的形式包在Bi2O3粒子表面，形成棱壳结构的复合粒子，复合粒子的平均粒度为78nm．核厚为60nm．
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| 关 键 词： | 氧化铋 铜铬复合氧化物 纳米材料 核壳结构 球形单分散 |
| 文章编号： | 1672-7207(2006)06-1019-06 |
| 收稿时间： | 2006-05-20 |
| 修稿时间： | 2006年5月20日 |
Synthesis of Bi2O3/Cu-O-Cr core/shell structured nano-composites |
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| LI Wei,CHENG Hua.Synthesis of Bi2O3/Cu-O-Cr core/shell structured nano-composites[J].Journal of Central South University:Science and Technology,2006,37(6):1019-1024. |
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| Authors: | LI Wei CHENG Hua |
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| Institution: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 3. School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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| Abstract: | Spherical monodisperse Bi_2O_3 nano-particles were prepared via a precipitation strategy.Then composites of Bi_2O_3/Cu-O-Cr with a homogeneous core/shell structure were prepared by coating Cu-O-Cr on the surfaces of the as-synthesized spherical monodisperse Bi_2O_3 nano-particles using in-situ precipitation method.Techniques of X-ray diffraction,transmission electron microscope,energy-dispersive X-ray spectroscopy,and Fourier-transform infrared spectroscope were employed to characterize the as-synthesized materials.The formation mechanism of the as-synthesized core/shell structured Bi_2O_3/Cu-O-Cr nano-particles was studied.The results show that the pre-coating of NH~+_4 on the surfaces of Bi_2O_3 nano-particles plays an essential role in the formation of homogeneous Bi_2O_3/Cu-O-Cr core/shell nano-particles.In the form of ammino complex,Cr-Cr composite oxides are coated on the surfaces of Bi_2O_3 particles to form core/shell structures Bi_2O_3/Cu-O-Cr particles with a mean particle size of 78 nm and core size of 60 nm. |
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| Keywords: | bismuth oxide copper/chromium composite oxide nano-material core/shell structure spherical monodisperse nano-particle |
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