| 초록 |
Titania nanotubes (TNT) produced by electrochemical anodization have been extensively explored as a new biomaterial for implants. Chemical inertness is the main weakness of TNT and surface modification is a possible solution of this problem. The aim of this study is to develop a flexible and facile method for surface modification of TNT to tailor new interfacial properties important in many biomedical applications. Compared to conventionally anodized NTs, the modified nanotubes provided a higher specific area for protein absorption. ZnO nanostructures have attracted much attention particularly due to it’s widely applications in optics, optoelectronics, sensors and actuators.1 The biocompatibility, low toxicity, high electron mobility and easy fabrication of ZnO are favorable for bio-sensing and bio-application.2 This paper reports the growth of ZnO nanorods on vertically oriented TNT using hydrothermal method3 under different conditions to modify new surface properties of TNT for biomedical implantable devices. The results demonstrate that the morphology and ordering of ZnO nanorods are determined by growth temperature, overall concentration of the precursors and deposition time. ZnO nanorod morphology and surface-to-volume ratio are most sensitive to temperature. At low temperature dense and vertically well-aliened nanorods were grown over the substrate whereas large plates were grown as the temperature increase. The dimensions of ZnO nanorods can be controlled by the overall concentration of the reactants and by temperature. In XRD the diffraction peaks at 2θ= 31.78, 34.45, 36.26, 47.53, and 56.54 were observed, which correspond to the (100), (002), (101), (102), and (110) reflections of zinc oxide, respectively. Furthermore, ZnO nanorods inserted titania nanotubes surface exhibited higher surface roughness as well as corrosion resistance than bare TNT. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2011-0028709, 2013R1A1A2012728 & 2014R1A4A10053 09). |
