Graphene (G) has been combined with carboxymethyl cellulose (C) for the development of environmentally friendly inks for printed electronics applications. Water-based ink formulations have been developed for screen-printing with graphene content up to 90 wt %. The printed patterns show a good distribution of the graphene within the cellulose matrix, allowing a good screen-printed pattern definition with a line thickness of 200 μm. The electrical percolation threshold is found to be around 0.18 of volume fraction, corresponding to 1.9 wt % of graphene in the ink composition. A maximum electrical resistivity of ρ = 1.8 × 10^–2 Ω m has been obtained for the G90:C10 ink composition, allowing the printing of suitable conductive patters for printed electronics. Further, the multifunctionality of the developed inks is demonstrated by the interesting thermoresistive and piezoresistive properties of the screen-printed G30:C70 and G65:C35 materials, respectively. The maximum thermoresistive sensitivity of S = −0.27 and piezoresistive Gauge factor (GF) of 1 < GF < 5 demonstrate the suitability of the materials for temperature and deformation sensors, respectively, demonstrating the multifunctionality of the materials and their wide range of potential applications in the area of printed electronics.

中文翻译：

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用于全印刷温度和变形传感器的水性石墨烯油墨

石墨烯（G）已与羧甲基纤维素（C）结合使用，以开发用于印刷电子应用的环保油墨。已经开发了用于丝网印刷的水性油墨制剂，其中石墨烯含量高达90wt％。印刷的图案显示出石墨烯在纤维素基质中的良好分布，从而以200μm的线宽实现了良好的丝网印刷图案清晰度。发现电渗透阈值为体积分数的约0.18，对应于油墨组合物中石墨烯的1.9重量％。最大电阻率ρ= 1.8×10 ^–2对于G90：C10油墨组合物，已获得Ωm，从而可以印刷适用于印刷电子产品的导电图案。此外，分别通过丝网印刷的G30：C70和G65：C35材料有趣的热阻和压阻特性证明了所开发油墨的多功能性。S = -0.27的最大热阻灵敏度和1 <GF <5的压阻应变系数（GF）分别证明了该材料适用于温度和变形传感器，这证明了该材料的多功能性及其在电子和计算机领域的广泛应用潜力。印刷电子领域。