通过脉冲laser消融实现3D打印导电碳-聚乳酸电极的氦辅助无溶剂电活化
Helium-assisted, solvent-free electro-activation of 3D printed conductive carbon-polylactide electrodes by pulsed laser ablation
摘要：
熔融沉积成型是发展最快的3D打印技术之一，在应用电化学领域也有许多应用。在这里，利用导电聚乳酸（C-PLA）的3D打印是最有前途的，由于其生物降解性，商业可用性，和易于加工。为了使用C-PLA作为电极材料，必须进行活化过程，去除聚合物基质并露出电活性填料。最流行的化学或电化学活化途径是在溶剂中进行的。在这篇手稿中，我们提出了一种新的，替代的方法对C-PLA激活与Nd：YAG（λ = 1064 nm）激光消融。我们提出并讨论了基于各种激光源操作条件和气体基质的激活效率。XPS，接触角，和拉曼分析进行表面化学的评价和讨论的活化过程的机制。在惰性气体基质（氦气）中进行的烧蚀过程提供了高度电活性的C-PLA电极表面，而当在空气中活化时，所得的电荷转移过程受到阻碍。这是由于热诱导氧化层的形成。激光处理的C-PLA在He气氛中的电分析性能通过咖啡因检测得到证实，基于CV和DPV研究，分别提供0.49和0.40 μ M（S/N = 3）的检测限。
英文摘要：
The fused deposition modeling is one of the most rapidly developing 3D printing techniques, with numerous applications, also in the field of applied electrochemistry. Here, utilization of conductive polylactic acid (C-PLA) for 3D printouts is the most promising, due to its biodegradability, commercial availability, and ease of processing. To use C-PLA as an electrode material, an activation process must be performed, removing the polymer matrix and uncovering the electroactive filler. The most popular chemical or electrochemical activation routes are done in solvents. In this manuscript, we present a novel, alternative approach towards C-PLA activation with Nd:YAG (lambda = 1064 nm) laser ablation. We present and discuss the activation efficiency based on various laser source operating conditions, and the gas matrix. The XPS, contact angle, and Raman analyses were performed for evaluation of the surface chemistry and to discuss the mechanism of the activation process. The ablation process carried out in the inert gas matrix (helium) delivers a highly electroactive C-PLA electrode surface, while the resultant charge transfer process is hindered when activated in the air. This is due to thermally induced oxide layers formation. The electroanalytical performance of laser-treated C-PLA in He atmosphere was confirmed through caffeine detection, offering detection limits of 0.49 and 0.40 microM (S/N = 3) based on CV and DPV studies, respectively.
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