| 基于不同还原剂体系银粉的可控制备 |
| Controlled Synthesis of Silver Particles with Different Reaction System |
|
| 摘要: 以硝酸银为原料，在不同温度条件下，分别以无机和有机还原剂，制备了不同形貌的银粉颗粒，采用扫描电子显微镜以及X射线衍射对其形貌与结构进行了表征。在此基础上，重点研究了不同还原体系对银粉颗粒形貌的影响，并提出了相应的机理。研究结果表明，以七水合硫酸亚铁作为还原剂时，银颗粒形貌由铁离子浓度控制，在高浓度，低反应速度条件下可得到花状银颗粒。随着体系浓度的下降，表面由粗糙花状变为光滑球状，导电性能并随之升高。以抗坏血酸作为还原剂，硫酸根为保护剂时，硫酸根浓度对银粉形貌有着很大的影响，随着硫酸根浓度的增加，银颗粒由球形变为枝片状。导电性能有所升高。 |
| 关键词: 银粉 七水合硫酸亚铁 抗坏血酸 可控制备 |
| 基金项目: 中国博士后基金(No.20100481084)，东南大学生物电子学国家重点实验室开放课题(No.20111218)资助项目。 |
| Abstract: Controlled synthesis of micron-sized silver particles with different morphology was realized by reducing silver nitrate with organic and inorganic reducing agents respectively, namely iron(Ⅱ) sulfate heptahydrate and ascorbic acid with sodium sulfate. By varying concentration and temperature of the reaction system, round, flower-like and dendritic silver particles with different size could be obtained. Structure and morphology of the silver particles were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In the basis, impacts of different reduction system on morphology of silver particles were detailed studied. Experimental results shown that, with the reaction system of iron(Ⅱ) sulfate heptahydrate, morphology of silver particle was controlled by concentration of iron ions. Flower-like silver particles can be obtained by lower reaction speed and higher concentration. With the system concentration decreased, morphology of silver become smooth spherical particles and conductive properties subsequently increased. On the other hand, when using ascorbic acid as reductant and sodium sulfate as protective agent, concentration of sulfate had a great impact on morphology of silver particle. With increasing concentration of sulfate, morphology of silver particles transferred from spherical to flaky and conductivity was increased at the same time. |
| Keywords: silver powder iron(Ⅱ) sulfate heptahydrate micrometer ascorbic acid controlled synthesis |
| 投稿时间：2013-11-22 修订日期：2014-03-21 |
| 摘要点击次数: 1392 |
| 全文下载次数: 1724 |
| 蔡奕康,陈才,庞峰飞,耿欣,韩国志.基于不同还原剂体系银粉的可控制备[J].无机化学学报,2014,30(6):1339-1344. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
