A simple water immersing treatment has been established for regulating the electrocatalytic activity of commercial graphene ink. This process enables to remove additives in graphene ink and consequently expose the surface defects. A graphene ink coated glass has been fabricated as an example platform for simultaneous determination of ascorbic acid (AA), dopamine (DA), and uric acid (UA). Cyclic voltammetry studied indicated electrocatalytic reaction can be initiated after the additives leaching during the water immersing treatment. Under optimal conditions, the linear calibration curves were achieved in the range of 50–1000, 3–140, and 0.5–150 μM, with detection limits of 17.8, 1.44 and 0.29 μM for AA, DA, and UA, respectively. This work demonstrated that the removal of additives of the graphene ink after film coating could be applied as a simple and cost-effective electrochemical platform for sensing application.

已经建立了一种简单的水浸处理来调节商用石墨烯油墨的电催化活性。该工艺能够去除石墨烯油墨中的添加剂，从而暴露出表面缺陷。已经制造了石墨烯墨水涂层玻璃作为同时测定抗坏血酸（AA），多巴胺（DA）和尿酸（UA）的示例平台。研究的循环伏安法表明，在浸水处理过程中，添加剂浸出后即可引发电催化反应。在最佳条件下，线性校准曲线的范围为50–1000、3–140和0.5–150μM，AA，DA和UA的检出限分别为17.8、1.44和0.29μM。