Sol–gel synthesis of calcium hydroxyapatite thin films on quartz substrate using dip-coating and spin-coating techniques

Sol–gel synthesis route was suggested to prepare calcium hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂, CHA) thin films on quartz substrates. CHA thin films were obtained using dip-coating and spin-coating techniques by coating the substrates 1, 5, 15 and 30 times. In the sol–gel process, the ethylenediaminetetraacetic acid and 1,2-ethandiol as complexing agents were used. Moreover, triethanolamine and polyvinyl alcohol were used as gel network forming materials. After each coating procedure the films were annealed at 1,000 °C. The results obtained from dip-coating and spin-coating techniques were compared in this study. It was demonstrated, that the formation of calcium hydroxyapatite depends on dipping (or spinning) time and annealing duration.