Characterization and Electrochemical Properties of Oxygenated Amorphous Carbon (a-C) Films
Palomäki, T., Wester, N., Johansson, L.-S., Laitinen, M., Jiang, H., Arstila, K., Sajavaara, T., Han, J. G., Koskinen, J., & Laurila, T. (2016). Characterization and Electrochemical Properties of Oxygenated Amorphous Carbon (a-C) Films. Electrochimica Acta, 220, 137-145. https://doi.org/10.1016/j.electacta.2016.10.063
Julkaistu sarjassa
Electrochimica ActaTekijät
Päivämäärä
2016Tekijänoikeudet
© 2016 Elsevier Ltd. This is a final draft version of an article whose final and definitive form has been published by Elsevier. Published in this repository with the kind permission of the publisher.
Amorphous carbon (a-C) films with varying oxygen content were deposited by closed-field unbalanced magnetron sputtering with the aim to understand the effect of oxygen on the structural and physical properties of the films and subsequently correlate these changes with electrochemical properties. The a-C films were characterized by transmission electron microscopy, helium-ion microscopy, atomic force microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and time-of-flight elastic recoil detection analysis. The electrochemical properties were studied by electrochemical impedance spectroscopy and cyclic voltammetry with several redox systems (Ru(NH3)62+/3+, Fe(CN)64−/3−, dopamine and ascorbic acid). The results indicated that the carbon films are amorphous with an ID/IG ratio near 2.6. The oxygen content of the films seemed to saturate at around 11 at. %, whereas the amount of surface oxygen functional groups increased steadily with increasing oxygen inflow during deposition. O/C ratio increased from 0.09 to 0.19. A significant increase in film resistivity was observed with increasing oxygen content. Lightly oxygenated a-C films showed a low charge transfer resistance (Rct) and reversible electron transfer for Ru(NH3)62+/3+ whereas both Rct and ΔEp increased considerably for heavily oxygenated films. The inner sphere redox systems were significantly affected by the surface oxygen functional groups with dopamine and ascorbic acid showing a linear increase in ΔEp and Epa, respectively, with increasing oxygen content. Fe(CN)64−/3− did not show a clear trend but was still clearly affected by the increase in oxygen content. The double layer capacitance was about 1 μF/cm2 for all the oxygenated a-C films.
...
Julkaisija
Pergamon Press; International Society of ElectrochemistryISSN Hae Julkaisufoorumista
0013-4686Asiasanat
Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/26269075
Metadata
Näytä kaikki kuvailutiedotKokoelmat
Samankaltainen aineisto
Näytetään aineistoja, joilla on samankaltainen nimeke tai asiasanat.
-
Experimental characterization of electronic, structural and optical properties of individual carbon nanotubes
Herranen, Olli (University of Jyväskylä, 2014) -
What Determines the Electrochemical Properties of Nitrogenated Amorphous Carbon Thin Films?
Etula, Jarkko; Wester, Niklas; Liljeström, Touko; Sainio, Sami; Palomäki, Tommi; Arstila, Kai; Sajavaara, Timo; Koskinen, Jari; Caro, Miguel A.; Laurila, Tomi (American Chemical Society (ACS), 2021)Linking structural and compositional features with the observed electrochemical performance is often ambiguous and sensitive to known and unknown impurities. Here an extensive experimental investigation augmented by ... -
Characterization of spatial porosity and mineral distribution of crystalline rock using X-ray micro computed tomography, C-14-PMMA autoradiography and scanning electron microscopy
Voutilainen, Mikko; Miettinen, Arttu; Sardini, Paul; Parkkonen, Joni; Sammaljärvi, Juuso; Gylling, Björn; Selroos, Jan-Olof; Yli-Kaila, Maarit; Koskinen, Lasse; Siitari-Kauppi, Marja (Pergamon, 2019)The spatial porosity and mineral distribution of geological materials strongly affects transport processes in them. X-ray micro computed tomography (X-μCT) has proven to be a powerful tool for characterizing the spatial ... -
DNA-based applications in molecular electronics
Linko, Veikko (University of Jyväskylä, 2011)This thesis is mainly focused on DNA molecules and especially on self-assembled DNA constructs and their potential applications in nanotechnology and molecular electronics. In the field of molecular electronics the ... -
Electronic spectroscopy of I2-Xe complexes in solid Krypton
Hulkko, Eero; Ahokas, Jussi; Lindgren, Johan; Myllyperkiö, Pasi; Pettersson, Mika (AIP, 2012)In the present work, we have studied ion-pair states of matrix-isolated I2 with vacuum-UV absorption and UV-vis-NIR emission, where the matrix environment is systematically changed by mixing Kr with Xe, from pure Kr to ...
Ellei toisin mainittu, julkisesti saatavilla olevia JYX-metatietoja (poislukien tiivistelmät) saa vapaasti uudelleenkäyttää CC0-lisenssillä.