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Solvent-free fabrication of paper based all-carbon disposable multifunctional sensors and passive electronic circuits

机译:无溶剂制造纸的全碳一次性多功能传感器和无源电子电路

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摘要

In light of recent interest in the green fabrication of electronics, we report eco-friendly engineered temperature sensors, pH sensors, humidity sensors and passive resistor-capacitor (RC) filters by solventfree processing of graphite on cellulose paper. This was achieved via direct writing of graphite pencil on cellulose paper which involves the deposition of few layers to multi layers of conductive graphene flakes intercalated by clay and wax. The temperature sensor exhibits a negative temperature coefficient of resistance of -4232 ppm K-1, which is comparable to that of conventional temperature sensors (platinum, nickel, and copper) that are fabricated by capital intensive and complex procedures. The dynamic response of the temperature sensor shows its repeatability with excellent response time of 13.5 s. The all-carbon pH sensor could efficiently distinguish acidic, alkaline and neutral solutions with significant sensitivity from 1.77 k Omega pH(-1) to 2.21 k Omega pH(-1). The higher sensitivity of the pH sensor is attributed to the oxygen functional groups present in pencil graphite which undergoes protonation and deprotonation in presence of H+ and OH- ions to alter the conductivity of graphite trace. The interdigitated capacitive humidity sensor shows a linear response to humidity with fast response (1.5-2 s) and recovery times (6-7 s). These fast response and recovery times are due to fast adsorption and evaporation kinetics of water molecules on polar OH groups of cellulose fibers in paper, which depends on porosity of the paper. The versatility of the pencil-on-paper approach was further explored by drawing resistor and interdigitated capacitor in series to fabricate in-plane all-carbon RC filter which demonstrate anticipated functionality with a cut-off frequency of 6 kHz. To the best of our knowledge, no studies have been reported on direct-write graphite on paper based in-plane all carbon passive electronic circuits, pH sensor and humidity sensor. This cleanroom-free approach further expands the scope of graphite on paper as a functional material in developing sensors and circuits for greener consumer electronics thereby causing no environmental contamination either in their production or disposal.
机译:据近期对电子产品的绿色制造兴趣,我们通过纤维素纸的石墨的溶剂加工报告Eco友好的工程温度传感器,pH传感器,湿度传感器和无源电阻电容器(RC)过滤器。这是通过直接写入纤维素纸上的石墨铅笔来实现的,这涉及少量层沉积到由粘土和蜡插入的多层导电石墨烯片。温度传感器具有-4232ppm k-1的负温度系数 - 4232ppm k-1,其与由资本密集和复杂的程序制造的传统温度传感器(铂,镍和铜)相当。温度传感器的动态响应显示其可重复性,响应时间为13.5秒。全碳pH传感器可以有效地区分酸性,碱性和中性溶液,从1.77kωpH(-1)至2.21kωpH(-1)的显着灵敏度。 pH传感器的较高敏感性归因于铅笔石墨中存在的氧官能团,其在H +和OH-离子存在下经历质子化和去质子化以改变石墨迹线的导电性。交叉的电容性湿度传感器显示出湿度的线性响应,快速响应(1.5-2秒)和恢复时间(6-7秒)。这些快速的响应和恢复时间是由于纸上的纤维素纤维的极性OH基团上的水分子的快速吸附和蒸发动力学,这取决于纸张的孔隙率。通过串联绘制电阻器和交叉的电容来进一步探索铅笔纸方法的多功能性,以制造在平面内的全碳RC过滤器,其展示了6 kHz的截止频率的预期功能。据我们所知,在平面内的纸张上的直接写石墨中没有报道任何研究,PH传感器和湿度传感器。这种无洁净室的方法进一步扩展了纸张图石墨的范围作为开发更绿色消费电子产品的传感器和电路的功能材料,从而在生产或处置中没有环境污染。

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  • 来源
    《RSC Advances》 |2016年第98期|共10页
  • 作者单位

    Indian Inst Technol Hyderabad Dept Elect Engn Kandi 502285 India;

    Indian Inst Technol Hyderabad Dept Elect Engn Kandi 502285 India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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