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Materials 2014, 7(3), 2014-2029; doi:10.3390/ma7032014
Article

Formation of Nanocones on Highly Oriented Pyrolytic Graphite by Oxygen Plasma

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Received: 14 January 2014; in revised form: 28 February 2014 / Accepted: 3 March 2014 / Published: 11 March 2014
(This article belongs to the Section Biomaterials)
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Abstract: Improvement in hemocompatibility of highly oriented pyrolytic graphite (HOPG) by formation of nanostructured surface by oxygen plasma treatment is reported. We have showed that by appropriate fine tuning of plasma and discharge parameters we are able to create nanostructured surface which is densely covered with nanocones. The size of the nanocones strongly depended on treatment time. The optimal results in terms of material hemocompatibility were obtained after treatment with oxygen plasma for 15 s, when both the nanotopography and wettability were the most favorable, since marked reduction in adhesion and activation of platelets was observed on this surface. At prolonged treatment times, the rich surface topography was lost and thus also its antithrombogenic properties. Chemical composition of the surface was always more or less the same, regardless of its morphology and height of the nanocones. Namely, on all plasma treated samples, only a few atomic percent of oxygen was found, meaning that plasma caused mostly etching, leading to changes in the surface morphology. This indicates that the main preventing mechanism against platelets adhesion was the right surface morphology.
Keywords: highly oriented pyrolytic graphite (HOPG); oxygen plasma treatment; nanocone formation; platelet adhesion highly oriented pyrolytic graphite (HOPG); oxygen plasma treatment; nanocone formation; platelet adhesion
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Vesel, A.; Eleršič, K.; Modic, M.; Junkar, I.; Mozetič, M. Formation of Nanocones on Highly Oriented Pyrolytic Graphite by Oxygen Plasma. Materials 2014, 7, 2014-2029.

AMA Style

Vesel A, Eleršič K, Modic M, Junkar I, Mozetič M. Formation of Nanocones on Highly Oriented Pyrolytic Graphite by Oxygen Plasma. Materials. 2014; 7(3):2014-2029.

Chicago/Turabian Style

Vesel, Alenka; Eleršič, Kristina; Modic, Martina; Junkar, Ita; Mozetič, Miran. 2014. "Formation of Nanocones on Highly Oriented Pyrolytic Graphite by Oxygen Plasma." Materials 7, no. 3: 2014-2029.


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