论文标题
底物表面形态在柔性电子产品的石墨烯墨水性能中的作用
Role of substrate surface morphology on the performance of graphene inks for flexible electronics
论文作者
论文摘要
二维（2D）材料（例如石墨烯）被视为在柔性基材上制造电子设备和电路的潜在候选物。 2D材料的油墨或分散可以通过大规模涂料技术（例如喷墨打印和喷雾涂层）沉积在柔性基板上。涂层过程的主要问题之一是墨水的不均匀沉积，这可能导致底物之间的性质变化很大。在这里，我们研究了表面形态在带有特定面漆的不同纸基板上沉积在不同纸基板上的石墨烯墨水的作用。具有良好润湿性能的底物会导致可再现的薄膜和电阻低的电性能。表面形态的正确选择可以使高性能膜无需重源后退火或治疗。引入了扫描Terahertz时域光谱（THZ-TDS），以评估石墨烯墨水在纸上的均匀性和局部电导率。证明了基于纸张的应变量表，可变电阻器充当操作LED的开关开关。因此，定制的表面可以帮助释放基于墨水的2D材料的全部潜力。
Two-dimensional (2D) materials, such as graphene, are seen as potential candidates for fabricating electronic devices and circuits on flexible substrates. Inks or dispersions of 2D materials can be deposited on flexible substrates by large-scale coating techniques, such as inkjet printing and spray coating. One of the main issues in coating processes is nonuniform deposition of inks, which may lead to large variations of properties across the substrates. Here, we investigate the role of surface morphology on the performance of graphene ink deposited on different paper substrates with specific top coatings. Substrates with good wetting properties result in reproducible thin films and electrical properties with low sheet resistance. The correct choice of surface morphology enables high-performance films without postdeposition annealing or treatment. Scanning terahertz time-domain spectroscopy (THz-TDS) is introduced to evaluate both the uniformity and the local conductivity of graphene inks on paper. A paper-based strain gauge is demonstrated and a variable resistor acts as an on-off switch for operating an LED. Customized surfaces can thus help in unleashing the full potential of ink-based 2D materials.
