Binder-free conductive graphite coatings on polyimide substrates for applications in flexible electronics

IF 2.3 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Coatings Technology and Research Pub Date : 2024-12-16 DOI:10.1007/s11998-024-01012-4

Gimhani C. Wikaramasinghe, Rangana M. Manamendra, K. R. Jaliya Manuda, Buddini Nissanka, Darshana L. Weerawarne, Dilushan R. Jayasundara

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引用次数: 0

Abstract

The production of graphite/graphene derivative inks, incorporating different solvents, binders, and stabilizers is a focused research area for the development of printed electronic circuits on flexible substrates. Within the scope of the present study, a facile methodology was employed to produce a water-based graphite paste, devoid of binders and stabilizers, serving as a conductive paste while preserving the unique properties of graphite. A superior adhesive graphite thin film, attaining a 5B standard according to the ASTM D3359 crosshatch adhesion test, was successfully developed on a polyimide substrate (PI). This graphite coating on polyimide (Gr/PI) was characterized using mechanical reliability tests and four-probe resistance measurements. The adhesive Gr/PI exhibited an optimal sheet resistance value of 114 ± 12 Ω/sq/mil. The shifts in the FTIR of Gr/PI, compared to the spectrum of PI indicate significant π-π interactions between the graphite and polyimide structure of the flexible substrate, elucidating the mechanism of graphite ink adhesion. The results obtained from ASTM mechanical reliability tests encompassing hardness, crease, and bending tests underscore the viability of employing Gr/PI in the manufacturing of conductive interconnects and electrodes for flexible electronic applications.

Graphical Abstract

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应用于柔性电子产品的聚酰亚胺基板上的无粘结剂导电石墨涂层

石墨/石墨烯衍生物油墨的生产，包括不同的溶剂，粘合剂和稳定剂，是柔性基板上印刷电子电路发展的重点研究领域。在本研究的范围内，采用一种简单的方法来生产水基石墨浆料，不含粘合剂和稳定剂，作为导电浆料，同时保留了石墨的独特性能。在聚酰亚胺基板（PI）上成功地开发了一种优异的粘合石墨薄膜，根据ASTM D3359交叉粘合测试达到5B标准。通过机械可靠性测试和四探针电阻测量，对聚酰亚胺（Gr/PI）石墨涂层进行了表征。胶粘剂Gr/PI的最佳薄片电阻值为114±12 Ω/sq/mil。与PI光谱相比，Gr/PI的FTIR变化表明石墨与柔性衬底的聚酰亚胺结构之间存在显著的π-π相互作用，阐明了石墨油墨粘附的机理。ASTM机械可靠性测试的结果包括硬度、折痕和弯曲测试，强调了在柔性电子应用的导电互连和电极制造中使用Gr/PI的可行性。图形抽象

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来源期刊

Journal of Coatings Technology and Research 工程技术-材料科学：膜

CiteScore

4.30

自引率

8.70%

发文量

130

审稿时长

2.5 months

期刊介绍： Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.