Environmentally Friendly Graphene Inks for Touch Screen Sensors,Advanced Functional Materials

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Environmentally Friendly Graphene Inks for Touch Screen Sensors
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-06-16 , DOI: 10.1002/adfm.202103287
Sergey Tkachev ₁ , Miguel Monteiro ₁ , João Santos ₁ , Ernesto Placidi ₂ , Mohamed Ben Hassine ₁ , Pedro Marques ₃ , Paulo Ferreira _{1,

4,

5} , Pedro Alpuim _{1,

6} , Andrea Capasso ₁

Affiliation

Graphene-based materials have attracted significant attention in many technological fields, but scaling up graphene-based technologies still faces substantial challenges. High-throughput top-down methods generally require hazardous, toxic, and high-boiling-point solvents. Here, an efficient and inexpensive strategy is proposed to produce graphene dispersions by liquid-phase exfoliation (LPE) through a combination of shear-mixing (SM) and tip sonication (TS) techniques, yielding highly concentrated graphene inks compatible with spray coating. The quality of graphene flakes (e.g., lateral size and thickness) and their concentration in the dispersions are compared using different spectroscopic and microscopy techniques. Several approaches (individual SM and TS, and their combination) are tested in three solvents (N-methyl-2-pyrrolidone, dimethylformamide, and cyrene). Interestingly, the combination of SM and TS in cyrene yields high-quality graphene dispersions, overcoming the environmental issues linked to the other two solvents. Starting from the cyrene dispersion, a graphene-based ink is prepared to spray-coat flexible electrodes and assemble a touch screen prototype. The electrodes feature a low sheet resistance (290 Ω □⁻¹) and high optical transmittance (78%), which provide the prototype with a high signal-to-noise ratio (14 dB) and multi-touch functionality (up to four simultaneous touches). These results illustrate a potential pathway toward the integration of LPE-graphene in commercial flexible electronics.

中文翻译：

用于触摸屏传感器的环保石墨烯墨水

石墨烯基材料在许多技术领域引起了广泛关注，但扩大石墨烯基技术仍面临巨大挑战。高通量自上而下的方法通常需要危险、有毒和高沸点的溶剂。在这里，提出了一种有效且廉价的策略，通过结合剪切混合 (SM) 和尖端超声 (TS) 技术，通过液相剥离 (LPE) 生产石墨烯分散体，从而产生与喷涂兼容的高浓度石墨烯油墨。使用不同的光谱和显微镜技术比较石墨烯薄片的质量（例如，横向尺寸和厚度）及其在分散体中的浓度。几种方法（单独的 SM 和 TS 及其组合）在三种溶剂 ( N-甲基-2-吡咯烷酮、二甲基甲酰胺和芘）。有趣的是，苯乙烯中 SM 和 TS 的组合产生了高质量的石墨烯分散体，克服了与其他两种溶剂相关的环境问题。从芘分散体开始，制备基于石墨烯的墨水来喷涂柔性电极并组装触摸屏原型。电极具有低薄层电阻 (290 Ω □ ^-1 ) 和高透光率 (78%)，为原型提供高信噪比 (14 dB) 和多点触控功能（最多四个同时触摸）。这些结果说明了将 LPE-石墨烯集成到商业柔性电子产品中的潜在途径。

更新日期：2021-08-17

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