Electrodeposition and biomineralization of nano-β-tricalcium phosphate on graphenated carbon nanotubes

SURFACE & COATINGS TECHNOLOGY

卷:297

Article

Metoki, N.¹  Rosa, C. M. R.²  Zanin, H.³  Marciano, F. R.²  Eliaz, N.¹  Lobo, A. O.² 

[1] Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel

[2] Univ Vale Paraiba, Inst Res & Dev, Lab Biomed Nanotechnol Nanobio, Av Shishima Hifumi 2911, BR-12244000 Sao Jose Dos Campos, SP, Brazil

[3] Univ Vale Paraiba, Inst Res & Dev, Lab Energy Storage & Supply ES&S, Av Shishima Hifumi 2911, BR-12244000 Sao Jose Dos Campos, SP, Brazil

关键词: Reduced graphene oxide (rGO);    Graphenated carbon nanotube (CNT);    Calcium phosphate (CaP);    Tricalcium phosphate (TCP);    Biomineralization;    Electrodeposition;   

DOI  :  10.1016/j.surfcoat.2016.04.035

来源: Elsevier

【 摘 要 】

Nano-calcium-phosphate (n-CaP) is an attractive, biocompatible material for increasing osteointegration. Among nanomaterials, functionalized carbon-based materials are emerging materials, which have excellent mechanical properties, biocompatibility and chemical stability. These properties may further enhance the n-CaP performance. It has been shown that stoichiometric n-CaP can be electrodeposited on graphene and carbon nanotubes (CNTs) by employing fast and low-cost electrodeposition techniques. Here, we present, for the first time, a crystalline, needle-like nano-beta-tricalcium phosphate (n-beta-TCP) electrodeposited on reduced graphene oxide (rGO) nanosheets. The rGO was grown on CNT, as a composite biomaterial, in a one-step process, followed by electrodeposition of n-CaP. The results show that, in acidic pH, needle-like crystals appear on the surface. It is speculated that the carboxyl (carboxylic acid)/carboxylate functional groups attached directly to the rGO are essential in accelerating OH- formation and deposition of needle-like n-CaP crystals. High-resolution scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction elucidated homogeneous, highly crystalline, n-CaP (beta-tricalcium phosphate) crystals. This composite presented an excellent in vitro biomineralization after soaking in simulated body fluid. (C) 2016 Elsevier B.V. All rights reserved.

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