Inkjet printing of electrochemical sensors using a highly loaded mildly edge‐oxidized graphene nanosheet (EOGN) ink is presented. An ink with 30 mg/mL EOGNs is formulated in a mixture of N‐methyl pyrrolidone and propylene glycol with only 30 min of sonication. The absence of additives, such as polymeric stabilizers or surfactants, circumvents reduced electrochemical activity of coated particles and avoids harsh post‐printing conditions for additive removal. A single light pulse from a xenon flash lamp dries the printed EGON film within a fraction of a second and creates a compact electrode surface. An accurate coverage with only ⁓30.4 µg of EOGNs per printed layer and cm 2 is achieved. The EOGN films adhere well to flexible polyimide substrates in aqueous solution. Electrochemical measurements were performed using cyclic voltammetry and differential pulse voltammetry. An all inkjet‐printed three‐electrode living bacterial cell detector is prepared with EOGN working and counter electrodes and silver‐based quasi‐reference electrode. The presence of E. coli in liquid samples is recorded with four electroactive metabolic activity indicators.

中文翻译：

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高负载轻度边缘氧化的石墨烯纳米片分散体，用于电化学传感器的大规模喷墨印刷

本文介绍了使用高负载的轻度边缘氧化石墨烯纳米片（EOGN）墨水对电化学传感器进行喷墨打印。仅需超声处理30分钟，即可在N-甲基吡咯烷酮和丙二醇的混合物中配制具有30 mg / mL EOGN的墨水。缺少添加剂，例如聚合物稳定剂或表面活性剂，可避免涂层颗粒的电化学活性降低，并避免了苛刻的印刷后去除添加剂的条件。氙气闪光灯发出的单个光脉冲会使印刷的EGON薄膜在不到一秒的时间内变干，并形成致密的电极表面。每个印刷层和cm 2仅有⁓30.4µg EOGN的精确覆盖。EOGN膜在水溶液中可很好地粘附到柔性聚酰亚胺基材上。使用循环伏安法和差分脉冲伏安法进行电化学测量。使用EOGN工作电极和对电极以及银基准参比电极制备全喷墨打印的三电极活菌细胞检测器。用四个电活性代谢活性指示剂记录液体样品中大肠杆菌的存在。