Thaís Cristina Cândido, Arnaldo César Pereira, Daniela Nunes da Silva
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引用次数: 0
摘要
本工作研制了一种用于印刷电化学传感器的碳质材料导电油墨。优化后的油墨分别由石墨、炭黑和指甲油组成(35.3:11.7:53%),丙酮为溶剂。考虑粘合剂的增溶性、油墨对丝网印刷工艺的适应性和较低的电阻,优化了配比。采用傅里叶变换红外光谱(FT-IR)、扫描电镜(SEM)、拉曼光谱(Raman)、电化学阻抗谱(EIS)和循环伏安法(CV)对所用材料和墨水进行了分析。所得电荷转移电阻(Rct)为0.348 kΩ。利用导电油墨在PET基板上打印电极,得到了柔性的一次性电极。得到的电活性面积为13.7 cm2,由Randles-Sevcik方程计算。通过氧化还原探针验证了该装置的适用性,灵敏度为0.02µa L mmol−1。导电油墨具有足够的均匀性,可以使用丝网印刷技术生产电极,估计生产成本为0.09 mL - 1美元。
Development and Characterization of Conductive Ink Composed of Graphite and Carbon Black for Application in Printed Electrodes
This work developed a conductive ink composed of carbonaceous material for printing electrochemical sensors. The optimized ink comprises graphite, carbon black, and nail polish, respectively (35.3:11.7:53%), as well as acetone as a solvent. The proportion was optimized with consideration of the binder’s solubilization, the ink’s suitability for the screen-printing process, and lower electrical resistance. The materials used, and the resulting ink, were analyzed by way of Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), Raman spectroscopy, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). The charge transfer resistance (Rct) obtained was 0.348 kΩ. The conductive ink was used to print an electrode on a PET substrate, and a flexible and disposable electrode was obtained. The electroactive area obtained was 13.7 cm2, which was calculated by the Randles-Sevcik equation. The applicability of the device was demonstrated with a redox probe, providing a sensitivity of 0.02 µ A L mmol−1. The conductive ink has adequate homogeneity for producing electrodes using the screen-printing technique, with a low estimated production cost of $ 0.09 mL−1.