Projects per year
Undoped a-C thin films were deposited with varying power density from 10 to 25 W/cm2 using unbalanced closed-field magnetron sputtering (CFUBMS). The effect of power density on the physical and electrochemical properties was investigated by experimental characterization methods and atomistic simulations. XPS indicated that the films were composed mostly of sp2-bonded carbon (55–58 at.%) with a small amount of oxygen (8–9 at.%) in the surface region. The films appeared completely amorphous in XRD. The ID/IG ratio obtained by Raman spectroscopy indicated an increase from 1.76 to 2.34 with power density. The experimental and simulated data suggested a possible ordering and/or clustering of the sp2 phase with power density as the cause of the improved electrical properties of the a-C films. The electrochemical properties of a-C were between those of glassy carbon and tetrahedral amorphous carbon with potential windows ranging from 2.77 to 2.93 V and double-layer capacitance values around 0.90 μF cm−2. Electron transfer for Ru(NH3)6 3+/2+ and FcMeOH+1/0 was reversible whereas that for IrCl6 2−/3− was quasi-reversible. Peak potential separation of dopamine and oxidation potential of ascorbic acid decreased with power density, correlating with the structural and electrical changes of the films. The a-C thin films deposited by CFUBMS are inherently conductive and their physical properties can be adjusted by varying the deposition parameters to a wide range of electrochemical applications.
|Number of pages||10|
|Early online date||1 Jan 2019|
|Publication status||Published - 1 Apr 2019|
|MoE publication type||A1 Journal article-refereed|
- amorphous carbon
- ascorbic acid
- closed-field unbalanced magnetron sputtering
- electrochemical properties
- HETEROGENEOUS ELECTRON-TRANSFER
- BORON-DOPED DIAMOND
FingerprintDive into the research topics of 'Effect of Power Density on the Electrochemical Properties of Undoped Amorphous Carbon (a-C) Thin Films'. Together they form a unique fingerprint.
- 1 Finished
FIRE: First-principles Electrochemistry (FIRE)
Laurila, T., Aarva, A., Leppänen, E., Isoaho, N., Johansson, L., Ahmed, R., Caro Bayo, M. & Palomäki, T.
01/09/2015 → 31/08/2018
Project: Academy of Finland: Other research funding
Anna Rissanen (Manager)Aalto University
OtaNano - Nanofab
Päivikki Repo (Manager)OtaNano
OtaNano - Nanomicroscopy Center
Jani Seitsonen (Manager)OtaNano