Wang Dengke, Zhang Wanggang, Wang Jian, Li Xiaohong, Liu Yiming
College of Chemical Engineering and Technology, Taiyuan University of Technology Taiyuan Shanxi 030024 China.
State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology Taiyuan Shanxi 030024 China.
RSC Adv. 2023 Jun 6;13(24):16610-16618. doi: 10.1039/d3ra01410j. eCollection 2023 May 30.
In recent years, the integration of flexible printed electronics and electrochemical sensors has emerged as a new approach for developing wearable biochemical detecting devices. Among the materials utilized in flexible printed electronics, carbon-based conductive inks are considered to be crucial. In this study, we propose a cost-effective, highly conductive, and environmentally friendly ink formulation utilizing graphite and carbon black (CB) as conductive fillers, resulting in a very low sheet resistance of 15.99 Ω sq (conductivity of 2.5 × 10 S m) and a printed film thickness of 25 μm. The unique "sandwich" structure of the working electrode (WE) printed with this ink enhances its electrical conductivity, leading to high sensitivity, selectivity, and stability, with almost no water film generated between the WE and the ion-selective membrane (ISM), strong ion selectivity, long-term stability, and anti-interference. The lower detection limit of the sensor for Na is 0.16 mM with a slope of 75.72 mV per decade. To validate the sensor's usability, we analyzed three sweat samples collected during physical activity, with Na concentrations within the typical range for human sweat (51 ± 4 mM, 39 ± 5 mM, and 46 ± 2 mM).
近年来，柔性印刷电子学与电化学传感器的集成已成为开发可穿戴生化检测设备的一种新方法。在柔性印刷电子学中使用的材料中，碳基导电油墨被认为至关重要。在本研究中，我们提出了一种具有成本效益、高导电性且环保的油墨配方，该配方使用石墨和炭黑（CB）作为导电填料，得到了非常低的15.99Ω/sq的方块电阻（电导率为2.5×10 S/m）以及25μm的印刷膜厚度。用这种油墨印刷的工作电极（WE）独特的“三明治”结构提高了其导电性，从而具有高灵敏度、选择性和稳定性，在WE和离子选择膜（ISM）之间几乎不产生水膜，具有很强的离子选择性、长期稳定性和抗干扰能力。该传感器对Na的检测下限为0.16 mM，斜率为每十倍75.72 mV。为了验证该传感器的可用性，我们分析了在体育活动期间采集的三个汗液样本，其Na浓度在人体汗液的典型范围内（51±4 mM、39±5 mM和46±2 mM）。
