多孔钛表面聚多巴胺层修饰及其载银研究

Polydopamine-Assisted Decoration of Porous Titanium Surface and Loading with Ag Nanoparticles

通过多巴胺自聚合在碱热处理多孔钛表面构建了聚多巴胺(PDA)膜层,利用聚多巴胺自身的还原性,成功将纳米银颗粒载入聚多巴胺修饰多孔钛表面,并探讨了沉积时间对纳米银颗粒负载量的影响。利用傅里叶变换红外光谱仪(FTIR)、场发射扫描电镜(FE-SEM)、能谱仪(EDS)、接触角测定仪和X射线光电子能谱(XPS)对聚多巴胺修饰及其载银多孔钛表面进行表征。研究结果表明,多巴胺能够在多孔钛表面自聚合形成聚多巴胺层,保留了钛表面的多孔结构;纳米银颗粒均匀沉积在PDA修饰的多孔钛表面,随着沉积时间的增加,多孔钛表面纳米银颗粒的负载量增加。

A biomimetic method for the preparation of porous titanium（pTi） surface loaded with silver nanoparticles（AgNPs） was demonstrated. First, the porous titanium surface was functionalized with a thin bio-inspired polydopamine（PDA） coating, simply by dipping the pTi substrate into an alkaline dopamine solution. Subsequently, in situ chemical reduction of silver ion was carried out on the pTi-PDA surface by immersing the pTi-PDA in silver nitrate solution and the effect of reaction time was discussed. The PDA and PDA/Ag layer on the porous titanium surfaces were characterized by scanning electron microscopy（SEM）, energy disperse spectroscopy（EDS）, fourier transform infrared（FTIR） spectroscopy, contact angle measurement and X-ray photoelectron spectroscopy（XPS）. The results indicate that PDA layer is deposited on the pTi surface and silver ions are reduced into silver nanoparticles on PDA layer with a controllable silver content.The binding force between AgNPs and pTi-PDA is so strong that AgNPs remain uniform after ultrasonicating for 1 h.