Details

Autor(en) / Beteiligte

• Jaroenapibal, P.
• Seekumbor, E.
• Triroj, N.

Titel

Adsorption of polar molecules on diamond-like carbon films with different trapped charge densities

Ist Teil von

• Diamond and related materials, 2016-05, Vol.65, p.125-130

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• This work investigates the effect of trapped charge densities present in diamond-like carbon films (DLC) on adsorption of polar molecules on the film surface. Hydrogen-free and hydrogenated DLC films with different hydrogen/carbon contents were produced using filtered-cathodic arc sputtering (FCA-sputtering) and radio-frequency plasma enhanced chemical vapor deposition (RF-PECVD) techniques, respectively. After treating the as-prepared films in a dilute solution of dipropylene glycol monomethyl ether, adsorption of such molecules was found throughout the film surface. Capacitance–voltage (C–V) measurements have shown that the DLC films with lower hydrogen/carbon content inherently have larger trapped charge accumulations within their structures. A charge density of 1600nC/cm2 was measured in a DLC film with a lower hydrogen/carbon content (produced from C2H4 and Ar precursors), while a much smaller charge density of 64nC/cm2 was measured in a DLC film with a higher hydrogen/carbon content (produced from 10% CH4 and 90% H2 precursors). A correlation between charge densities and the degree of polar molecule adsorption was observed. Films with higher charge densities appeared to be more prone to polar molecule adsorption. [Display omitted] •Effect of trapped charges on polar molecule adsorption on DLC films is reported.•C–V measurement is used to characterize trapped charge densities in DLC films.•DLC films with lower H/C content are found to have greater trapped charge density.•DLC films with higher charge density are more prone to polar molecule adsorption.