粒径可控的微纳米银粉制备及在导电油墨中的应用

发布时间：2018-01-08 04:15

本文关键词：粒径可控的微纳米银粉制备及在导电油墨中的应用　出处：《电子科技大学》2015年硕士论文　论文类型：学位论文

更多相关文章： 纳米银 微米银 粒径可控 导电油墨

【摘要】：近年来,以微纳研究为基础的科技动力,正催化着工业领域发生革命性变化。微纳材料作为一种新型的功能性材料,以其优良的电学性能、化学性能、光学性能受到人们的广泛关注。研究表明,微纳银粉的优异性能及应用受到其晶体结构、形貌、粒径、粒度分布、分散性等一系列物理参数影响。因此,实现微纳银粉的可控制备具有重大的理论和现实意义。银粉的形貌可控的工艺渐臻成熟,在一定程度上实现了银粉性质的调控。本文采用化学还原法在水相中分别制备出粒径各异的微纳银粉。实现对银粉粒径的可控制备,进一步对其性质实现可控、优化。本论文,在纳米银粒径可控制备中,建立以银盐用量、晶种大小和用量为参变量的可控制备模型。以抗坏血酸为还原剂,PVP为分散剂,通过氢氧化钠用量调整还原剂还原动力,对氯化银胶体进行还原制备粒径不同的晶种;并将自制晶种添加到亚微米银粉反应体系中,人为分配新生银原子在核化过程和生长过程中的吸附量,实现亚微米级银粉粒径可控制备。扫描电镜结果分析表明:通过调节氢氧化钠用量可实现粒径20-100 nm纳米粉体的可控制备;通过调节银盐用量、晶种大小和用量可实现粒径145-315 nm亚微米级粉体的可控制备。在微米银粒径可控制备中,建立以银盐用量、体系酸碱度和分散剂用量为参变量的可控制备模型。以抗坏血酸为还原剂、PVP为分散剂,在40°C水浴中,还原硝酸银。通过调节各工艺参数,探究其对粒径的影响规律,并利用此规律,得到粒径可控的银粉。扫描电镜结果分析表明:粉体粒径随着硝酸银浓度、分散剂用量的增大而增大;以pH=4为等电位点,粉体粒径随体系酸碱度与等电位点的差值增大而减小。最后,本文用自制的银粉制备导电油墨,对其进行了初步研究,结果表明:以自制银粉制备导电油墨,其导电性基本满足油墨应用条件,在印刷电路技术上有着一定的应用前景。
[Abstract]:In recent years, the scientific and technological power based on micro-nano research is catalyzing revolutionary changes in the industrial field. As a new functional material, micro-nano materials have excellent electrical and chemical properties. The study shows that the excellent properties and applications of nanocrystalline silver powder are affected by a series of physical parameters such as crystal structure, morphology, particle size, particle size distribution, dispersion and so on. It is of great theoretical and practical significance to realize the controllable preparation of nanocrystalline silver powder, and the process of controlling the morphology of silver powder is becoming more and more mature. To a certain extent, the properties of silver powder were regulated. In this paper, the micronano silver powder with different particle size was prepared in water phase by chemical reduction method. The controlled preparation of silver powder particle size was realized, and the properties of silver powder were further controlled. Optimization. In this thesis, a controllable preparation model was established in which the amount of silver salt, the size and amount of seed were used as parameters, and ascorbic acid as reducing agent PVP was used as dispersant in the controlled preparation of silver nanoparticles. Through the amount of sodium hydroxide to adjust the reducing power of reducing agent, the silver chloride colloid was reduced to prepare the seed with different particle size. The self-made seeds were added to the sub-micron silver powder reaction system, and the adsorption amount of the new silver atoms in the nucleation and growth process was artificially distributed. The results of scanning electron microscopy showed that the controlled preparation of 20 ~ 100 nm nano-powders could be achieved by adjusting the amount of sodium hydroxide. By adjusting the amount of silver salt, the size and amount of crystal seed can be controlled preparation of 145-315 nm submicron powder. In the controlled preparation of micron silver particle size, the amount of silver salt can be established. The controlled preparation model of the system with pH and dispersant dosage as parameters. Using ascorbic acid as reducing agent PVP as dispersant, silver nitrate was reduced in water bath of 40 掳C. various technological parameters were adjusted. The effect of silver powder on the particle size was studied and the controlled size silver powder was obtained. The results of SEM showed that the particle size increased with the increase of the concentration of silver nitrate and the amount of dispersant. With pH=4 as the equipotential point, the particle size decreases with the increase of the difference between the pH and the equipotential point of the system. Finally, the conductive ink is prepared with self-made silver powder and studied preliminarily. The results show that the electric conductivity of conductive ink prepared from self-made silver powder basically meets the requirements of ink application and has a certain application prospect in printing circuit technology.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;TS802.3

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