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Electrodeposition of hydroxyapatite functionalized carbon nanotubes (HAp/fCNTs)) coatings on the surface of 316l stainless steel

The results show that the HAp/fCNTs nanocomposite coatings contain single phase of HAp and CNTs with the coating thickness of 6.9 µm and the amount of fCNTs in the coatings is 6.95 %. With the presence of fCNTs in HAp coatings, the solubility of the coatings decreases in comparision with pure HAp coatings. | Vietnam Journal of Science and Technology 55 (6) (2017) 706-715 DOI: 10.15625/2525-2518/55/6/9153 ELECTRODEPOSITION OF HYDROXYAPATITE/FUNCTIONALIZED CARBON NANOTUBES (HAp/fCNTs) COATINGS ON THE SURFACE OF 316L STAINLESS STEEL Nguyen Thi Thom1, 2, *, Pham Thi Nam1, Nguyen Thu Phuong1, Cao Thi Hong1, Nguyen Van Trang1, Nguyen Thi Xuyen1, Dinh Thi Mai Thanh1, 2, 3 1 2 3 Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Cau Giay, Ha Noi Graduate University of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Cau Giay, Ha Noi * Email: nguyenthomsp@gmail.com Received: 12 January 2017; Accepted for publication: 11 October 2017 Abstract. The coatings of hydroxyapatite/functionalized carbon nanotubes (HAp/fCNTs) were successfully synthesized on the surface of 316L stainless steel (316L SS) by electrodeposition. To improve the dispersion of CNTs into the electrolyte, CNTs were functionalized in the mixture of 67 % HNO3 and 98 % H2SO4 before electrodeposition coatings to form fCNTs. Different amounts of fCNTs were incorporated into the apatite coatings by adding fCNTs into the electrolyte solution. In this study, Fourier Transform Infrared Spectroscopy (FT-IR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and mechanical techniques were used to analyze characteristics of HAp/fCNTs coatings. The results show that the HAp/fCNTs nanocomposite coatings contain single phase of HAp and CNTs with the coating thickness of 6.9 µm and the amount of fCNTs in the coatings is 6.95 %. With the presence of fCNTs in HAp coatings, the solubility of the coatings decreases in comparision with pure HAp coatings. Keywords: 316L SS, electrodeposition, hydroxyapatite, fCNTs, HAp/fCNTs nanocomposite. 1. INTRODUCTION Research and fabrication of biomedical materials for implants have received .