کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5447902 | 1511764 | 2017 | 9 صفحه PDF | دانلود رایگان |
- Zn-doped HA/GP composites were synthesized by one-pot hydrothermal treatment for the first time.
- DFT calculations showed that the doping of Zn ions in HA/GP could result in the formation of hydrogen bonding.
- TEM images showed HA nanoparticles were uniformly dispersed on the GP surface and exhibited fine rod-like morphology.
- The increasing contents of Zn doping tend to have a negative effect on interfacial interaction between Zn-doped HA and GP.
Zn-doped hydroxyapatite/graphene (Zn-doped HA/GP) composite was successfully in situ synthesized by one-pot hydrothermal treatment for the first time, and was studied through experimental analysis and density functional theory calculations. The effects of a series of Zn contents (0mol%, 1mol%, 5mol%, 10mol% and 20mol%) on the HA crystal structure, the morphology and composition of composites were also investigated. The obtained doped composites were analyzed and characterized by the techniques of field emission scanning electron microscopy (FESEM) coupled with energy dispersive X-ray detector (EDX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and Raman spectroscopy. Density functional theory calculations of Zn-doped HA showed that the replacement of Zn ions in HA crystal lattice could cause the OHâ group to move off the c axis toward the Zn ions and become closer to the PO43â group, resulting in the formation of hydrogen-bond between OHâ and PO43â groups. The morphology of Zn-doped HA/GP composite showed that Zn-doped HA grains with molar fraction of 1Â mol% Zn are intimately attached on the surface of graphene whereas the amounts of Zn-doped HA attached on the GP surface reduce obviously and the interfacial interactions are weakened accordingly as the Zn doping amount increased from 5 to 20Â mol%, which indicates that the low crystallinity of Zn-doped HA particles due to an increasing Zn content may have a negative effect on interfacial interaction between Zn-doped HA and GP.
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Journal: Materials Chemistry and Physics - Volume 199, 15 September 2017, Pages 122-130