Vaughan Eoghan, Santillo Chiara, Imbrogno Alessandra, Gentile Gennaro, Quinn Aidan J, Kaciulis Saulius, Lavorgna Marino, Iacopino Daniela
Tyndall National Institute, University College Cork, Lee Maltings Complex, Dyke Parade, Cork T12R5CP, Ireland.
Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, P.le E. Fermi 1, 80055 Portici, Italy.
ACS Sustain Chem Eng. 2023 Sep 1;11(37):13574-13583. doi: 10.1021/acssuschemeng.3c02708. eCollection 2023 Sep 18.
In this study, the laser-induced graphitization process of sustainable chitosan-based formulations was investigated. In particular, optimal lasing conditions were investigated alongside the effect of borax concentration in the chitosan matrix. In all cases, it was found that the obtained formulations were graphitizable with a CO laser. This process gave rise to the formation of high surface area, porous, and electrically conductive laser-induced graphene (LIG) structures. It was found that borax, as a cross-linker of chitosan, enabled the graphitization process when its content was ≥30 wt % in the chitosan matrix, allowing the formation of an LIG phase with a significant content of graphite-like structures. The graphitization process was investigated by thermogravimetric analysis (TGA), Raman, X-ray photoemission (XPS), and Fourier transform infrared (FTIR) spectroscopies. LIG electrodes obtained from CS/40B formulations displayed a sheet resistance as low as 110 Ω/sq. Electrochemical characterization was performed after a 10 min electrode activation by cycling in 1 M KCl. A heterogeneous electron transfer rate, , of 4 × 10 cm s was determined, indicating rapid electron transfer rates at the electrode surface. These results show promise for the introduction of a new class of sustainable composites for LIG electrochemical sensing platforms.
在本研究中，对可持续壳聚糖基配方的激光诱导石墨化过程进行了研究。特别地，研究了最佳激光条件以及硼砂浓度在壳聚糖基质中的影响。在所有情况下，发现所获得的配方可用CO激光进行石墨化。该过程导致形成高表面积、多孔且导电的激光诱导石墨烯（LIG）结构。发现硼砂作为壳聚糖的交联剂，当其在壳聚糖基质中的含量≥30 wt%时能够实现石墨化过程，从而允许形成具有大量类石墨结构的LIG相。通过热重分析（TGA）、拉曼光谱、X射线光电子能谱（XPS）和傅里叶变换红外（FTIR）光谱对石墨化过程进行了研究。由CS/40B配方获得的LIG电极显示出低至110 Ω/sq的薄层电阻。在1 M KCl中循环10分钟进行电极活化后进行电化学表征。测定了异质电子转移速率 为4×10 cm s，表明电极表面的电子转移速率很快。这些结果为引入用于LIG电化学传感平台的新型可持续复合材料带来了希望。
