石墨烯/纳米银导电油墨导电性能研究

目的制备出具有优异导电性能的石墨烯/纳米银复合材料,并作为导电填料,以提高导电油墨的导电性能。方法采用Hummers法制备氧化石墨烯,以葡萄糖作为还原剂,采用同步还原法制备石墨烯/纳米银,将石墨烯/纳米银复合物和纳米银按不同比例混合作为导电填料来制备导电油墨。通过透射电镜(TEM)、X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱等分析测试方法表征了石墨烯/纳米银复合材料的微观结构和形貌,并通过四探针法对油墨的导电性进行检测。结果纳米银颗粒均匀地负载在石墨烯片层上,纳米银粒径约为35 nm;掺杂石墨烯/纳米银复合物质量分数为12%时,导电油墨的电阻率可达到1.08×10~(-7)?·m,导电性能提高约64%。结论制备的复合材料石墨烯呈片状,结构完好,添加到导电油墨中能明显提高导电性能。     

石墨烯/纳米银导电油墨导电性能研究

目的 -制备出具有优异导电性能的石墨烯/纳米银复合材料,并作为导电填料,以提高导电油墨的导电性能。方法 -采用Hummers法制备氧化石墨烯,以葡萄糖作为还原剂,采用同步还原法制备石墨烯/纳米银,将石墨烯/纳米银复合物和纳米银按不同比例混合作为导电填料来制备导电油墨。通过透射电镜(TEM)、X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱等分析测试方法表征了石墨烯/纳米银复合材料的微观结构和形貌,并通过四探针法对油墨的导电性进行检测。结果 -纳米银颗粒均匀地负载在石墨烯片层上,纳米银粒径约为35nm;掺杂石墨烯/纳米银复合物质量分数为12%时,导电油墨的电阻率可达到1.08×10~(-7)Ω·m,导电性能提高约64%。结论 -制备的复合材料石墨烯呈片状,结构完好,添加到导电油墨中能明显提高导电性能。     

导电油墨及其印刷技术的研究进展

目的 综述导电油墨及其印刷方式的研究进展,为开发价格低廉、性能稳定、导电性优良的导电油墨提供参考。方法 通过查阅文献归纳各类导电油墨的制备方式、印刷方式和应用领域,对导电油墨进行系统分类,比较各类导电油墨的性能和优缺点,并对其印刷技术进行分析,展望了导电油墨的发展前景。结果 目前关于导电油墨的研究集中在纳米银、纳米铜、石墨烯等导电填料的低温烧结油墨,主要采用丝网印刷、喷墨印刷等印刷方式,多用于制备传感器、柔性可穿戴设备等。未来的研究仍需关注如何低成本、低能耗、简单大量地制造导电油墨。结论 导电油墨的制备将与环境友好型的印刷方式相结合,向高导电性、高印刷适性发展,成为印刷电子领域的关键技术。     

填充银纳米棒新型导电油墨

采用微波辅助原位氧化还原法制备长径比均匀的银纳米棒, 研究了制备条件参数如催化剂浓度、 表面活性剂与先驱体浓度比率等因素对制备银纳米材料的形貌的影响。以这些银纳米棒作为导电填料制备印刷用导电油墨, 研究了填料含量、 纳米棒及纳米粒子的比率对导电油墨的电导率、 附着力、 老化性能的影响。结果表明, 当晶体生长催化剂NaCl与AgNO₃的摩尔比为1:5时, 得到的银纳米材料中纳米棒比例达95%以上。对导电油墨的性能研究表明, 当填料中银纳米棒比例为95%时得到的导电胶具有最低的渗滤阈值, 为62%, 同时经过80℃、 85%RH老化环境老化500 h后导电油墨的体积电阻率上升不超过10%。     

纳米铜导电油墨的制备及其应用

综述了纳米铜粒子的制备方法,即机械球磨法、辐射合成法、物理气相沉积法等物理制备法及化学制备法,探讨了改进纳米铜导电油墨防氧化、低温烧结、导电性能等关键问题,以及纳米铜导电油墨在印刷RFID电子标签、薄膜开关、触摸屏等方面的应用,并提出纳米铜导电油墨未来的研究方向为：抗氧化、低温烧结、多种印刷方式及产品应用等研究。     

纳米银导电油墨及其在柔性印刷电子中的应用

目的 探究纳米银导电油墨及其在柔性印刷电子中的应用。方法 通过总结国内外文献,从纳米银颗粒及其导电油墨的制备、印刷工艺、烧结工艺以及在柔性印刷电子技术中的应用几方面总结近年来的研究进展。结果 在油墨制备及使用中,简化制备工艺、降低生产成本、实现绿色环保、低温烧结,同时提高油墨的基材适应性是未来纳米银导电油墨的改进重点。直写技术具有精度高、速度快等优势,正逐渐替代丝网印刷技术成为主流。烧结工艺的研究重点在于实现低温烧结,其中化学烧结工艺简单,但提高导电性是研究重点。其他烧结方式则设备昂贵,环境要求高。结论 作为功能性电子材料,纳米银导电油墨因出色的电性能和印刷适性,正在被广泛应用于柔性印刷电子中。近年来通过对纳米银及其导电油墨的深入研究及技术改进,在纳米银颗粒的制备、低温烧结技术、节能环保加工工艺等方面获得了一定的进展。与此同时,将其作为功能材料应用于制备柔性传感器中,RFID标签天线、柔性电极、超级电容器、太阳能电池等正受到广泛研究与应用。     

导电油墨制备技术及应用进展

从复合导电油墨的组成、分类及其特点等方面,说明了复合导电油墨的应用优势;从复合导电油墨导电机理、制备技术、应用领域等方面的分析可以看出,复合导电油墨目前国内外的研究主要集中在超细金属填料制备、基体支撑聚合物低温固化条件以及填料与基体之间复合对导电性能的影响等方面.由于该类材料兼有低温粘接和导电性能,必将成为未来印制电子技术中的关键材料.     

高密度聚乙烯/纳米石墨导电纳米复合材料压敏特性研究

以高密度聚乙烯(HDPE)为基体,纳米石墨为导电填料,通过双辊混炼制备了具有良好压敏特性的导电纳米复合材料.研究了纳米石墨复合材料的电学性能及压敏性能,讨论了纳米石墨含量以及加压次数对导电复合材料压敏特性的影响.     

复合碳系导电油墨的制备及性能研究

目的 研究碳纳米管与石墨烯对复合碳系导电油墨性能的影响,开发性能优异的导电油墨。方法 分别探究碳纳米管管径尺寸、碳纳米管与石墨烯的配比、油墨中的碳质量分数及油墨涂层厚度对复合碳系导电油墨导电性的影响,并基于实验数据对各影响因素拟合出相应的预测模型。最终确定油墨的优选配比,并对采用优选配比制备的导电油墨涂层进行电热转换测试。结果 由石墨烯和管径尺寸为25nm的多壁碳纳米管为导电填料制备的导电油墨涂层综合导电性能最优,当导电油墨中碳质量分数为2.5%（纳米管质量分数为0.125%、石墨烯质量分数为2.375%）、水性丙烯酸树脂质量分数为5.25%、油墨涂层固化后厚度为0.147 mm时,油墨导电涂层电阻率为0.089 3Ω·cm。在外接电压为5 V的条件下,导电油墨的功率为13.49 W,由室温通电工作至100℃仅需13.723 s,油墨涂层发热均匀性满足JG/T 286—2020的要求。结论 采用优选配比制备的油墨涂层内部搭建起均匀丰富的导电网络,极大地提升了油墨的导电性,使得油墨电热性能优异。     

用于水性导电油墨的纳米银分散液的制备

运用液相化学还原法,以次磷酸钠(NaH2 PO2 ·H2 O)为还原剂,PVP(聚乙烯吡咯烷酮)为高分子保护剂,六偏磷酸钠为分散剂,还原硝酸银溶液制得了用于水性导电油墨的纳米银分散液。设计4 因素3 水平的正交实验L9(33 ),研究了还原剂用量、保护剂用量、分散剂用量及反应温度对纳米银粉粒度及形貌的影响,获得了制备纳米银分散液的最佳条件:在AgNO3 浓度为1. 0 mol/ L 时,n( NaH2 PO2 ·H2 O) / n( AgNO3 ) 为2. 5 :1,n(PVP) / n(AgNO3 )为1. 5 :1,n(六偏磷酸钠) / n(AgNO3 )为0. 007 :1,反应温度为40 ℃的条件下,制备的纳米银分散液放置30 d 后,经SEM 表征和纳米粒度及电位分析仪测试,可获得主要粒度分布在15 ~60 nm 的纳米银分散液,克服了水性导电油墨填料易絮凝的问题。     

Printed UHF RFID antennas with high efficiencies using nano-particle silver ink

One of the most popular targets of conductive ink technology is to print RFID tag antennas. However, the printed RFID antennas, manufactured by conductive silver ink which is generally based on microsized silver particles, have lower conductivity and consequently lower radiation efficiency than those by conventional copper etching method. This work demonstrates nano-particle conductive silver ink that is capable of printing UHF RFID antennas with improved radiation efficiency. Compared with commercial micro-particle silver ink, the solid content of metal is much higher in the proposed nanoparticle silver ink, leading to better electrical properties. Two types of dipole antennas are printed with the proposed nano-particle as well as with commercial micro-particle inks. Also, the same antennas are fabricated by copper etching. With these conductive inks, a straight and a meandered dipole antennas are fabricated and their radiation efficiencies are measured with the Wheeler cap method. Experimental results show that the radiation efficiencies of the antennas based on nanoparticle silver ink are superior to those printed with the micro-particle silver ink, and are comparable to those of popular copper antennas.     

碳纳米管对碳系导电油墨电热性能的影响

目的 研究碳纳米管对碳系水性导电油墨电热性能的影响,寻找最佳含量的发热油墨。方法 采用单因素法,在原有碳系水性导电油墨中通过添加不同含量的碳纳米管制备多组碳系水性电热油墨。通过测试其SEM、TEM、电热功率、接触角等探究碳系水性电热油墨的最佳制备配方。结果 不同碳纳米管含量的碳系水性电热油墨其发热温度、电功率具有一定的差异。在其他条件一定的情况下,随着碳纳米管含量的增加,碳系水性导电油墨的电热导电性先降低再升高。当碳纳米管质量分数为0.75%时,碳系水性导电油墨的可以达到温度最高（147℃）,功率相对较低（4.4 W）,此时为导电性最佳碳系水性电热油墨的配方。结论 在导电油墨中添加适量的碳纳米管可改善油墨的加热性能。     

Printed antennas with variable conductive ink layer thickness

One of the complex tasks in mass production of RF electronics is printing the communication antenna using electrically conductive ink. For example, this is very common for radio- frequency identification (RFID) tags. Electrical properties of the ink are mostly determined by conductive (e.g. silver) particles mixed into the ink solution and the way they `connect' in the cured ink. It is also desirable to minimise the amount of ink used per antenna, because high-conducting metals like silver used in the ink are rather expensive. Metal-based inks have limited conductivity, so the thicker the cured ink layer will be the better the antenna radiation efficiency can be achieved, but also the higher will be the costs. In the paper, the authors report on the investigations of the possibility of minimising the amount of ink used per antenna. This can be achieved by printing thicker ink layers, where antenna structures are known to have high current density. Two common antenna structures and a dedicated antenna for passive RFID are used in the investigation. The main result of the paper is that radiation efficiency depends primarily on the total amount of ink used for printing the antenna, rather than on the variations of the layer thickness within the antenna structure     

液相剥离法制备石墨烯导电油墨的研究进展

目的 综述液相剥离法制备石墨烯导电油墨的研究现状，为促进石墨烯导电油墨在印刷电子领域的应用提供参考。方法 针对各种形式液相剥离制备石墨烯导电油墨的方法，分别从所使用溶剂的物理化学性能、制备流程、制得石墨烯导电油墨的性能等方面进行归纳和对比。结果 目前，液相剥离法制备石墨烯导电油墨的研究主要集中在提升石墨烯的分散性和油墨的导电性能等方面，未来需关注液相剥离过程中溶剂和助剂的选择，沿着低成本、绿色化、产业化等方向发展。     

Composite inks of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate)/silver nanoparticles and electric/optical properties of inkjet-printed thin films

Poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate)/silver nanoparticles composite inks have been prepared through in situ synthesis and ultrasonic dispersion. The developed inks were proved to be suitable for various inkjet printing trials to deposit the thin films which were subsequently characterized to assess their electric and optical properties. The results have indicated that the dedoping of PSS from PEDOT during the in situ synthesis can be detrimental to the conductivity of the deposited composite films. However, the addition of silver nanoparticles to pristine PEDOT:PSS has significantly enhanced the conductivity of the thin films, with an inevitable loss in transparency. The various factors that can influence the properties of the thin films have also been analyzed and discussed. This study provides an insight into the effect of silver nanoparticles on PEDOT:PSS thin films deposited using inkjet printing process, and their properties due to the methods of ink formulation.     

Rheological properties and screen printability of UV curable conductive ink for flexible and washable E-textiles

As a critical component for the realization of flexible electronics,multifunctional electronic textiles(etextiles)still struggle to achieve controllable printing accuracy,excellent flexibility,decent washability and simple manufacturing.The printing process of conductive ink plays an important role in manufacturing e-textiles and meanwhile is also the main source of printing defects.In this work,we report the preparation of fully flexible and washable textile-based conductive circuits with screen-printing method based on novel-developed UV-curing conductive ink that contains low temperature and fast cure features.This work systematically investigated the correlation between ink formulation,rheological properties,screen printability on fabric substrates,and the electrical properties of the e-textile made thereafter.The rheological behaviors,including the thixotropic behavior and oscillatory stress sweep of the conductive inks was found depending heavily on the polymer to diluent ratio in the formulation.Subsequently,the rheological response of the inks during screen printing showed determining influence to their printability on textile,that the proper control of ink base viscosity,recovery time and storage/loss modulus is key to ensure the uniformity of printed conductive lines and therefore the electrical conductivity of fabricated e-textiles.A formulation with 24 wt%polymer and 10.8 wt%diluent meets all these stringent requirements.The conductive lines with 1.0 mm width showed exceptionally low resistivity of 2.06×10^-5Ωcm Moreover,the conductive lines presented excellent bending tolerance,and there was no significant change in the sample electrical resistance during 10 cycles of washing and drying processes.It is believed that these novel findings and the promising results of the prepared product will provide the basic guideline to the ink formulation design and applications for screen-printing electronics textiles.     

Paper-based nanosilver conductive ink

Monolayer-protected silver nanoparticles sized 5 nm were directly synthesized in relatively high concentration (0.093 M) in water phase using cheap chemicals. The ink (20 % silver) prepared with the silver nanoparticles was written on sulfuric paper by a facile pen-on-paper paradigm. The effect factors on the formation and conductive mechanism of the nanosilver films from the silver ink were studied, including the microstructure, size evolution and interaction of particles and so on. Results show that the silver nanoink allows for a low sintering temperature and with a relatively high conductivity. The grown particle, increased inter-particle contact area and off dodecanoic acid layer were the three dominating factors responded to the conductivity of the nanosilver films.