Preparation and Hemocompatibility of Neodymium Incorporated Zinc Oxide Thin Films

Zinc oxide thin films doped with different neodymium(Nd) contents(1at%,2at% and 3at%) were grown on Si(100) substrates by radio frequency magnetron sputtering.X-ray diffraction(XRD) patterns show that all of the ZnO thin films have highly preferred growth along c-axis direction.The intensity of(002) diffraction peaks weakens and the gain size decreases with the increasing of Nd dopants.The optical transmittance of all the films exceeds 85% in the visible light region,and the optical band gap increases from 3.30 eV to 3.40 eV with the increasing of the Nd dopants.The surface chemical state of ZnO thin films is examined by X-ray photoelectron spectroscope(XPS),confirming that Nd element exists as Nd3+ in the films.Contact angle test is also employed to analyze the effect of Nd dopant on the wettability and surface energy.The platelets adhesion experiment shows that fewer platelets adhere and deform on ZnO and Nd doped ZnO thin films.Nd element and hydrophobility surface are the main factors leading to the better blood compatibility of ZnO thin films.