纳米银导电墨水的制备及室温打印性能研究

发布时间：2018-01-06 03:12

本文关键词：纳米银导电墨水的制备及室温打印性能研究　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：在电子工业中,电路板及导电线路的制作方法是非常重要的。喷墨打印技术是一种代替传统丝网印刷、蚀刻法、胶板印刷等方法的新型印刷电路板制作技术。通过使用有机或无机导电墨水,喷墨打印技术可以无掩膜、非接触的打印不同的高精度、高密度的导电线路。由于喷墨打印技术对设备要求低、工艺参数简单、原材料节省且环境友好,因而被大量应用在消费类电子产品领域,如柔性电路板、太阳能电池、生物传感器、透明导电膜、电磁波屏蔽材料、无线射频电子标签等。喷墨打印技术的核心是导电功能墨水的制备,其中纳米银导电墨水由于制备工艺简单、导电性能优良且墨水化学稳定性好而备受关注。本文使用硝酸银、柠檬酸钠为主要原料,通过化学还原法制备出20 nm粒径和50 nm粒径的两种纳米银颗粒。通过使纳米银粒子分散于特殊配比的溶剂中制备得到:1)20 nm粒径纳米银导电墨水;2)50 nm粒径纳米银导电墨水;3)根据调配两种粒径纳米银颗粒配比获得复合纳米银导电墨水。其次,本文通过喷墨打印技术将以上三类导电墨水图案化,研究了纳米银烧结结构的形貌及其导电性能。研究发现60%复合纳米银颗粒(20 nm粒径纳米银:50 nm粒径纳米银=2:1)的导电墨水打印结构导电性能最佳,其电阻率低至3.576×10-6Ω·cm。进而,本文以60%复合纳米银颗粒导电墨水为原料,研究了打印层数及烧结温度对打印导电层电阻率的影响。实验发现当打印层数为17层且烧结温度为180℃时,可以获得最低电阻率,其值为3.542×10-6Ω·cm。在研究烧结温度对打印层电阻率的影响时,发现当打印在富士相纸基板上时导电层在室温下可自发烧结。其内在原因在于富士相纸基板表面结构主要为硅醇基团,该基团可破坏纳米银粒子表面有机物包覆层的柠檬酸根与银粒子的配位键,致使纳米银粒子接近、并且接触而烧结。在此基础上,选取不同阴离子钠盐配制成溶液,分别研究了NaOH溶液、NaCl溶液、Na_2CO_3溶液和Na_2SO_4溶液对纳米银打印结构的室温烧结影响。结果表明,NaOH溶液和NaCl溶液均可在室温下促进导电层烧结,经过NaCl溶液处理导电层在室温下电阻率可低至5.3×10-6Ω·cm。
[Abstract]:In the electronics industry, circuit board and manufacturing method of conductive lines is very important. Inkjet printing technology is a kind of instead of the traditional screen printing, etching, new production technology of printed circuit board offset printing method. By using the organic or inorganic conductive ink, ink-jet printing technology can mask, high precision contact print different, conductive lines. Due to the high density of ink-jet printing technology low requirement on equipment, simple process parameters, raw material saving and environmental friendly, which is widely used in the field of consumer electronics products, such as flexible circuit board, solar cell, biosensors, transparent conductive film, electromagnetic shielding materials, wireless the RF electronic label. The core of inkjet printing technology is conductive ink preparation, including nano silver conductive ink because of simple preparation, good conductivity and chemical stability of ink Good and concern. This paper use silver nitrate, sodium citrate as the main raw material was prepared with 20 nm diameter and 50 nm diameter of two kinds of silver nanoparticles by chemical reduction. The silver nanoparticles dispersed in a specific ratio of solvent preparation: 1) 20 nm particle size of nano silver conductive ink; 2) 50 nm particle size of nano silver conductive ink; 3) according to the deployment of two kinds of particle size of nano silver particles to obtain composite ratio of nano silver conductive ink. Secondly, the above three kinds of conductive ink is patterned by inkjet printing technology, on the morphology of silver nanoparticles sintered structure and conductive properties. The study found that 60% nano composite silver particles (20 nm diameter: 50 nm nano silver particle size of nano silver =2:1) conductive ink printing structure conductive property is best, the resistivity as low as 3.576 x 10-6. Cm.. And then, based on the 60% composite nanoparticles of silver conductive ink as raw materials, research the printing layer Effect of sintering temperature on the conductive layer and the resistivity of the print. The experimental results showed that when the printing layer is 17 and the sintering temperature is 180 degrees centigrade, the lowest resistivity can be obtained, and its value is 3.542 * 10-6. Cm. on the effect of sintering temperature on the printing layer resistivity, when printed on Fuji paper substrate when conducting layer at room temperature can have a fever. The reason lies in its inherent Fuji substrate surface structure is mainly the silanol groups, the group of silver nanoparticles can damage the surface of organic coating layer of citrate and silver nanoparticles coordination bonds, resulting in silver nanoparticles and close contact and sintering. On this basis, choose different prepare the sodium anion solution, NaOH solution and NaCl solution were studied at room temperature, sintering of Na_2CO_3 solution and Na_2SO_4 solution on nano silver print structure effect. The results showed that NaOH and NaCl solution were available in the room The conductive layer is sintered at temperature. The resistivity of the conductive layer can be as low as 5.3 x 10-6 Omega cm. at room temperature after NaCl solution treatment.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN41

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