| 稳定分散的纳米银溶胶的制备及其表征 |
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| 引用本文： | 王悦辉,周 济,王 婷.稳定分散的纳米银溶胶的制备及其表征[J].无机化学学报,2007,23(8):1485-1490. |
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| 作者姓名： | 王悦辉 周 济 王 婷 |
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| 作者单位： | 1. 电子科技大学中山学院化学与生物系,中山,528402
2. 清华大学新型陶瓷与精细工艺国家重点实验室,北京,100084 |
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| 基金项目： | 国家自然科学基金;国家自然科学基金;中国博士后科学基金 |
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| 摘 要： | Stable aqueous dispersive colloidal Ag nanoparticles were prepared by reducing silver nitrate with sodium borohydride in the presence of 3-mercaptopropionic acid. The formation process of the Ag nanoparticles was investigated by UV-Visible spectroscopy and transmission electron microscopy. The results show that the spherical and rodlike particles and aggregates are formed in the initial stage of the reaction， then the rodlike particles and aggregates are gradually decomposed into small spherical particles， and the final obtained Ag nanoparticles with an average size of 8 nm are in uniform shapes and narrow size distribution， and the colloid remains stable for more than one month， which makes it convenient for use in practice. The presence of capping agent plays an extra role over nanoparticles stabilization and morphology. The presence of capping agent on the surface of Ag nanoparticle is confirmed by the X-ray photoelectron spectroscopy. It is found that Ag nanoparticles are negatively charged in alkaline condition， whereas they are positively charged in acid condition. Electrosteric effect is responsible for their long-term stability.
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| 关 键 词： | 银纳米颗粒 稳定 3-巯基丙酸 静电作用 |
| 文章编号： | 1001-4861（2007）08-1485-06 |
| 修稿时间： | 2007-04-232007-06-27 |
Preparation and Characterization of Stable Dispersive Colloidal Silver Nanoparticles |
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| WANG Yue-Hui,ZHOU Ji and WANG Ting.Preparation and Characterization of Stable Dispersive Colloidal Silver Nanoparticles[J].Chinese Journal of Inorganic Chemistry,2007,23(8):1485-1490. |
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| Authors: | WANG Yue-Hui ZHOU Ji and WANG Ting |
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| Institution: | 1Department of Chemistry and Biology, University of Electronic Science and Technology of China, Zhongshan Insitute, Zhongshan, Guangdong 528402;2State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 |
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| Abstract: | Stable aqueous dispersive colloidal Ag nanoparticles were prepared by reducing silver nitrate with sodium borohydride in the presence of 3-mercaptopropionic acid. The formation process of the Ag nanoparticles was investigated by UV-Visible spectroscopy and transmission electron microscopy. The results show that the spherical and rodlike particles and aggregates are formed in the initial stage of the reaction,then the rodlike particles and aggregates are gradually decomposed into small spherical particles,and the final obtained Ag nanoparticles with an average size of 8 nm are in uniform shapes and narrow size distribution,and the colloid remains stable for more than one month,which makes it convenient for use in practice. The presence of capping agent plays an extra role over nanoparticles stabilization and morphology. The presence of capping agent on the surface of Ag nanoparticle is confirmed by the X-ray photoelectron spectroscopy. It is found that Ag nanoparticles are negatively charged in alkaline condition,whereas they are positively charged in acid condition. Electrosteric effect is responsible for their long-term stability. |
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| Keywords: | Ag nanoparticles stable 3-mercaptopropionic acid electrosteric effect |
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