Yang Cheng, Venton B Jill
Department of Chemistry, University of Virginia, McCormick Road, Box 400319, Charlottesville, Virginia 22904-4319, United States.
IEEE Int Symp Med Meas Appl. 2017 May;2017:100-105. doi: 10.1109/MeMeA.2017.7985857. Epub 2017 Jul 20.
3D printing technology has been widely used as a rapid prototyping fabrication tool in several fields, including electrochemistry. In this work, we incorporate 3D printing technology with carbon nanotube yarns for electrochemical sensing of dopamine in the presence of ascorbic acid and uric acid. The novel 3D printed electrode provides a circular concavity detection zone with grooves to insert three electrodes. The electrode connections are fully compatible with conventional screen printed electrode workstation setups. The CNT yarn 3D printed electrode showed excellent electrocatalytic activity for the redox reaction of dopamine (DA) in the presence of ascorbic acid (AA) and uric acid (UA). Three well-defined sharp and fully resolved anodic peaks were found with the peak potentials using cyclic voltammetry (CV) at 50 mV, 305 mV, and 545 mV for AA, DA, and UA respectively and using differential pulse voltammetry (DPV) at 91 mV, 389 mV, and 569 mV, respectively. DA detection limit was 0.87 ± 0.09 μM. The CNT yarn 3D printed electrode displayed high reproducibility and stability. The electrode design enables the study of electrode reactions at the sidewall of CNTs, which cannot be performed using electrodes made by conventional fabrication methods. The new fabrication method provides a new platform to prototype new electrode materials for electrochemistry, providing a low-cost, customizable design compatible existing screen printed electrodes technology.
3D打印技术已作为一种快速成型制造工具在包括电化学在内的多个领域得到广泛应用。在本工作中，我们将3D打印技术与碳纳米管纱线相结合，用于在抗坏血酸和尿酸存在的情况下对多巴胺进行电化学传感。这种新型的3D打印电极提供了一个带有凹槽的圆形凹面检测区，用于插入三个电极。电极连接与传统的丝网印刷电极工作站设置完全兼容。碳纳米管纱线3D打印电极在抗坏血酸（AA）和尿酸（UA）存在的情况下对多巴胺（DA）的氧化还原反应表现出优异的电催化活性。使用循环伏安法（CV）时，分别在50 mV、305 mV和545 mV处发现了三个定义明确、尖锐且完全分辨的阳极峰，分别对应AA、DA和UA；使用差分脉冲伏安法（DPV）时，峰电位分别在91 mV、389 mV和569 mV处。DA的检测限为0.87±0.09 μM。碳纳米管纱线3D打印电极显示出高重现性和稳定性。这种电极设计能够研究碳纳米管侧壁上的电极反应，而这是使用传统制造方法制成的电极无法进行的。这种新的制造方法为电化学新电极材料的原型制作提供了一个新平台，提供了一种与现有丝网印刷电极技术兼容的低成本、可定制设计。
