LAUSR

Abstract A series of regular dot-matrix microstructures were constructed on titanium (Ti) surface via a femtosecond laser microfabrication in different medium, in air and in hydroxyapatite (HA) suspension, for depositing biocompatible elements Ca-P. The X-ray diffraction (XRD) results reveal that the deposition of Ca-P mainly exists in the form of Ca3(PO4)2 crystal on Ti surfaces. Compared with its counterpart prepared in air, the building block of dot-matrix microstructure fabricated in HA suspension presents a micro-hole shape with inner wall filled with mastoid-like nanostructures, which is more conducive to the deposition of Ca-P. Moreover, its composition is also more stable, supported by the atomic percentages of Ca and P on the treated Ti surfaces. Such textured Ti surfaces demonstrate good hydrophilic properties, beneficial to Ca-P deposition. The strategy for effective deposition of Ca-P on Ti surfaces shows great potential in the design of biocompatible surface of implants and medical devices and the improvement of their performance.