William B. Veloso, Gabriel N. Meloni, Iana V. S. Arantes, Lauro A. Pradela-Filho, Rodrigo A. A. Muñoz and Thiago R. L. C. Paixão
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引用次数: 0
Abstract
3D printing has attracted the interest of researchers due to its creative freedom, low cost, and ease of operation. Because of these features, this technology has produced different types of electroanalytical platforms. Despite their popularity, the thermoplastic composites used for electrode fabrication typically have high electrical resistance, resulting in devices with poor electrochemical performance. Herein, we propose a new strategy to improve the electrochemical performance of 3D-printed electrodes and to gain chemical selectivity towards glucose detection. The approach involves synthesising a nanostructured gold film using an infrared laser source directly on the surface of low-contact resistance 3D-printed electrodes. The laser parameters, such as power, focal distance, and beam scan rate, were carefully optimised for the modification steps. Scanning electronic microscopy and energy-dispersive X-ray spectroscopy confirmed the morphology and composition of the nanostructured gold film. After modification, the resulting electrodes were able to selectively detect glucose, encouraging their use for sensing applications. When compared with a gold disc electrode, the gold-modified 3D-printed electrode provided a 44-fold current increase for glucose oxidation. As proof of concept, the devices were utilised for the non-enzymatic catalytic determination of glucose in drink samples, demonstrating the gold film's catalytic nature and confirming the analytical applicability with more precise results than commercial glucometers.
3D 打印技术以其自由创意、低成本和易于操作等特点吸引了研究人员的兴趣。由于这些特点,该技术已生产出不同类型的电分析平台。尽管很受欢迎,但用于电极制造的热塑性复合材料通常具有较高的电阻,导致设备的电化学性能较差。在此,我们提出了一种新策略来改善 3D 打印电极的电化学性能,并获得葡萄糖检测的化学选择性。该方法是利用红外激光源直接在低接触电阻 3D 打印电极表面合成纳米结构金膜。激光参数(如功率、焦距和光束扫描速率)在改性步骤中经过了仔细优化。扫描电子显微镜和能量色散 X 射线光谱证实了纳米结构金膜的形态和成分。改性后的电极可以选择性地检测葡萄糖,从而促进了其在传感领域的应用。与金圆盘电极相比,金修饰的 3D 打印电极在葡萄糖氧化过程中的电流增加了 44 倍。作为概念验证,这些装置被用于饮料样品中葡萄糖的非酶催化测定,证明了金膜的催化性质,并证实了其分析适用性,其结果比商用血糖仪更精确。