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Atomically Resolved Calcium Phosphate Coating on a Gold Substrate


Some articles have revealed that electrodeposition of calcium phosphate (CaP) coatings entails a precursor phase, similarly to biomineralization in vivo. The chemical composition of the initial layer and its thickness are, however, still arguable, to the best of our knowledge. Moreover, while CaP and electrodeposition of metal coatings have been studied utilizing atom-probe tomography (APT), electrodeposition of CaP ceramics has not been heretofore studied. Herein, we present an investigation of CaP deposition on a gold substrate. Using APT and transmission electron microscopy (TEM) it is found that a mixture of phases, which could serve as transient precursor phases to hydroxyapatite (HAp) initially, can be detected. The thickness of these phases is tens nanometers, and it consists of amorphous CaP (ACP), dibasic calcium phosphate dehydrate (DCPD), and octacalcium phosphate (OCP). This demonstrates the value of using atomic-resolved characterization techniques for identifying the precursor phases. It also indicates that their transformation kinetics into the more stable HAp is not too fast to enable their observation. The coating gradually displays higher Ca/P atomic ratios, a porous nature, and concomitantly a change in its density.

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Publication details

The article was received on 14 Jan 2018, accepted on 07 Mar 2018 and first published on 08 Mar 2018

Article type: Paper
DOI: 10.1039/C8NR00372F
Citation: Nanoscale, 2018, Accepted Manuscript
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    Atomically Resolved Calcium Phosphate Coating on a Gold Substrate

    N. Metoki, S. I. Baik, D. Isheim, D. Mandler, D. Seidman and N. Eliaz, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR00372F

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