New electrochemically improved tetrahedral amorphous carbon films for biological applications

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Title: New electrochemically improved tetrahedral amorphous carbon films for biological applications
Authors: Laurila, Tomi | Protopopova, Vera | Rhode, Sneha | Sainio, Sami | Palomäki, Tommi | Moram, Michelle | Feliu, Juan M. | Koskinen, Jari
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Tetrahedral amorphous carbon | Thin films | Electrochemistry | Dopamine | Biomaterials
Knowledge Area: Química Física
Issue Date: Oct-2014
Publisher: Elsevier
Citation: Diamond and Related Materials. 2014, 49: 62-71. doi:10.1016/j.diamond.2014.08.007
Abstract: Carbon based materials have been frequently used to detect different biomolecules. For example high sp3 containing hydrogen free diamond-like carbon (DLC) possesses many properties that are beneficial for biosensor applications. Unfortunately, the sensitivities of the DLC electrodes are typically low. Here we demonstrate that by introducing topography on the DLC surface and by varying its layer thickness, it is possible to significantly increase the sensitivity of DLC thin film electrodes towards dopamine. The electrode structures are characterized in detail by atomic force microscopy (AFM) and conductive atomic force microscopy (C-AFM) as well as by transmission electron microscopy (TEM) combined with electron energy loss spectroscopy (EELS). With cyclic voltammetry (CV) measurements we demonstrate that the new improved DLC electrode has a very wide water window, but at the same time it also exhibits fast electron transfer rate at the electrode/solution interface. In addition, it is shown that the sensitivity towards dopamine is increased up to two orders of magnitude in comparison to the previously fabricated DLC films, which are used as benchmarks in this investigation. Finally, it is shown, based on the cyclic voltammetry measurements that dopamine exhibits highly complex behavior on top of these carbon electrodes.
Sponsor: The authors T.L, V.P., S.S., T.P., and J.K., would like to acknowledge the National Agency for Technology and Innovation (grant number 211488) and Aalto University (grant number 902380) for the financial support.
ISSN: 0925-9635 (Print) | 1879-0062 (Online)
DOI: 10.1016/j.diamond.2014.08.007
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version:
Appears in Collections:INV - EQSUP - Artículos de Revistas

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