NDLI: Microwave plasma induced surface modification of diamond-like carbon films

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Microwave plasma induced surface modification of diamond-like carbon films

Content Provider	Scilit
Author	Polaki, Shyamala Rao Kumar, Niranjan Krishna, Nanda Gopala Madapu, Kishore Kamruddin, Mohamed Dash, Sitaram Tyagi, Ashok Kumar
Copyright Year	2017
Description	Journal: Surface Topography: Metrology and Properties Tailoring the surface of diamond-like carbon (DLC) film is technically relevant for altering the physical and chemical properties, desirable for useful applications. A physically smooth and $sp^{3}$ dominated DLC film with tetrahedral coordination was prepared by plasma-enhanced chemical vapor deposition technique. The surface of the DLC film was exposed to hydrogen, oxygen and nitrogen plasma for physical and chemical modifications. The surface modification was based on the concept of adsorption–desorption of plasma species and surface entities of films. Energetic chemical species of microwave plasma are adsorbed, leading to desorbtion of the surface carbon atoms due to energy and momentum exchange. The interaction of such reactive species with DLC films enhanced the roughness, surface defects and dangling bonds of carbon atoms. Adsorbed hydrogen, oxygen and nitrogen formed a covalent network while saturating the dangling carbon bonds around the tetrahedral $sp^{3}$ valency. The modified surface chemical affinity depends upon the charge carriers and electron covalency of the adsorbed atoms. The contact angle of chemically reconstructed surface increases when a water droplet interacts either through hydrogen or van dear Waals bonding. These weak interactions influenced the wetting property of the DLC surface to a great extent.
Related Links	http://iopscience.iop.org/article/10.1088/2051-672X/aa806f/pdf
e-ISSN	2051672X
DOI	10.1088/2051-672x/aa806f
Journal	Surface Topography: Metrology and Properties
Issue Number	4
Volume Number	5
Language	English
Publisher	IOP Publishing
Publisher Date	2017-11-09
Access Restriction	Open
Subject Keyword	Journal: Surface Topography: Metrology and Properties Coatings and Films Dlc Film
Content Type	Text
Resource Type	Article

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