Electrodeposition of capsaicin-induced ZnO/Zn nanopillar films for marine antifouling and antimicrobial corrosion
Electrodeposition of capsaicin-induced ZnO/Zn nanopillar films for marine antifouling and antimicrobial corrosion
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电沉积辣椒素诱导的 ZnO/Zn 纳米柱薄膜用于海洋防污和抗菌腐蚀
DOI：
10.1016/j.surfcoat.2020.125959
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发表时间：
2020-09
影响因子：
5.4
通讯作者：
Hou Baorong
中科院分区：
文献类型：
--
作者：
Zhai Xiaofan;Ju Peng;Guan Fang;Ren Yadong;Liu Xin;Wang Nan;Zhang Yimeng;Duan Jizhou;Wang Chuanxing;Hou Baorong
具有纳米柱状形态的氧化锌能够杀死附着的细菌和真菌，是一种很有前途的海洋防污材料。具有纳米柱状形貌的氧化锌在镀锌钢表面表现出超强的抗菌性能，这使得ZnO/Zn纳米柱膜在船舶防污和抗腐蚀方面具有广阔的应用前景。因此，寻找一种有效的方法在钢表面涂覆ZnO/Zn纳米柱膜具有重要的意义。电沉积法是制备ZnO晶体和镀锌涂层的通用方法，它可以控制所得薄膜的形貌和结构。因此，本研究将辣椒素加入碱性电解质中，诱导ZnO纳米柱的形成。由于在电解液中加入辣椒素，在一次阴极电沉积中获得了ZnO/Zn纳米柱膜。电解液中添加的辣椒素通过酰胺键上的- nh -官能团吸附在电沉积表面。电沉积电位的负移促进了Zn(OH)42−的扩散。扫描电镜（SEM）和x射线衍射（XRD）结果表明，当电解质中辣椒素浓度为0.6 g L−1时，得到了规则的ZnO纳米柱。所制得的ZnO/Zn纳米柱膜在大肠杆菌悬浮液中具有较高的抗菌性能和相对较低的活菌覆盖率，在海洋防污方面具有广阔的应用前景。电化学评价表明，辣椒素诱导的ZnO/Zn纳米柱膜在硫酸盐还原菌（SRB）介质中具有显著增强的耐腐蚀性。此外，结果表明，在电解质中添加0.6 g L−1浓度的辣椒素可以获得最佳的膜，其细菌覆盖率最低，耐腐蚀性最高。
Zinc oxide with the morphology of nanopillar is promising marine antifouling materials as they can kill adhered bacteria and fungi. The zinc oxide with the morphology of nanopillar has shown super-antibacterial properties on galvanized steel, which makes ZnO/Zn nanopillar films promising in marine antifouling and antimicrobial corrosion. Thus, an efficient approach to coat ZnO/Zn nanopillar films on steel is of great significance. The electrodeposition method is a universal method for both ZnO crystals and galvanized coatings, and it can control the morphologies and structures of the resultant films. Therefore, in this study, capsaicin was added into an alkaline electrolyte to induce the formation of ZnO nanopillars. Due to capsaicin addition to the electrolyte, ZnO/Zn nanopillar films were obtained in a single cathodic electrodeposition. The added capsaicin in the electrolyte was absorbed on the electrodepositing surface by the functional –NH– groups in amide bond. The Zn(OH)42−diffusion was promoted by negatively shifted electrodepositing potential. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) results illustrate that regular ZnO nanopillars were obtained when the capsaicin concentration was 0.6 g L−1in the electrolyte. The resultant ZnO/Zn nanopillar films showed high antibacterial properties inEscherichia colisuspended solutions and relatively low living bacterial coverage, indicating promising application in marine antifouling. Electrochemical evaluation revealed that the obtained capsaicin-induced ZnO/Zn nanopillar films exhibited significantly enhanced corrosion resistance in a sulfate-reducing bacteria (SRB) medium. Moreover, the results illustrate that adding 0.6 g L−1concentration of capsaicin in the electrolyte yielded the best films, which featured the lowest bacterial coverage and highest corrosion resistance.
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