Geng Zenghua, Wang Xia, Guo Xuecheng, Zhang Zheng, Chen Yanjun, Wang Yifeng
School of Material Science and Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
J Mater Chem B. 2016 May 21;4(19):3331-3338. doi: 10.1039/c6tb00336b. Epub 2016 Apr 27.
Electrodeposition is an attractive technique that provides a controllable and programmable means to trigger the assembly of stimuli-responsive biopolymers (e.g., chitosan) for a diverse range of applications. Here, we report a new electrodeposition method for chitosan based on the coordination of chitosan to the metal ions in situ-generated by simultaneous electrochemical oxidation. In particular, we typically construct a deposited hydrogel on the copper electrode through this coordinated electrodeposition method, and the obtained hydrogel is smooth, transparent and homogeneous, as well as it has stability under acidic conditions and enough strength to be readily peeled from the electrode. This coordinated electrodeposition can be conveniently employed to build coatings (on the electrodes) or hydrogel films (peeled from the electrodes) with various shapes, and it also enables nanoparticles (e.g., fluorescent carbon dots) to be codeposited with chitosan. Furthermore, by enlisting the special benefits of the coordinated electrodeposition, the diverse hydrogel patterns can be constructed on the electrodes. Interestingly, this coordinated electrodeposition can be employed to directly build the complex hydrogel on the electrode to perform electrochemical detection. Therefore, it can be expected that this coordinated electrodeposition of chitosan has promising applications in biomedical devices, surface coating, and metallic biomaterials.
电沉积是一种具有吸引力的技术，它提供了一种可控且可编程的方法，用于触发刺激响应性生物聚合物（如壳聚糖）的组装，以实现多种应用。在此，我们报道了一种基于壳聚糖与通过同步电化学氧化原位生成的金属离子配位的壳聚糖电沉积新方法。具体而言，我们通常通过这种配位电沉积方法在铜电极上构建沉积水凝胶，所得水凝胶光滑、透明且均匀，并且在酸性条件下具有稳定性以及足够的强度以便于从电极上剥离。这种配位电沉积可方便地用于构建各种形状的涂层（在电极上）或水凝胶膜（从电极上剥离），还能使纳米颗粒（如荧光碳点）与壳聚糖共沉积。此外，借助配位电沉积的特殊优势，可在电极上构建多种水凝胶图案。有趣的是，这种配位电沉积可用于直接在电极上构建复合水凝胶以进行电化学检测。因此，可以预期壳聚糖的这种配位电沉积在生物医学设备、表面涂层和金属生物材料方面具有广阔的应用前景。
