Characterization and Electrochemical Properties of Oxygenated Amorphous Carbon (a-C) Films

Palomäki, Tommi; Johansson, Leena‐Sisko; Laitinen, Mikko; Jiang, Hua; Arstila, Kai; Sajavaara, Timo; Han, Jeon G.; Koskinen, Jari; Laurila, Tomi

doi:10.1016/j.electacta.2016.10.063

Cited by 19 publications

(12 citation statements)

References 23 publications

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“…Sample fabrication details are provided as Supporting Information, and the more detailed description of the a-C deposition process can be found from ref for ta-C and ND from, and that of PyC from …”

Section: Methodsmentioning

confidence: 99%

“…Both a-C and ta-C have good electrochemical properties such as a large water window and a low background signal, which makes them highly attractive for electroanalytical chemistry . There are several articles reporting their qualities as sensors for neurotransmitter detection (a-C , and ta-C ,− ). Due to the smoothness of these films and the inert nature of carbon, these materials are less susceptible for biological fouling than metals.…”

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confidence: 99%

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Electrochemical Fouling of Dopamine and Recovery of Carbon Electrodes

et al. 2017

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A significant problem with implantable sensors is electrode fouling, which has been proposed as the main reason for biosensor failures in vivo. Electrochemical fouling is typical for dopamine (DA) as its oxidation products are very reactive and the resulting polydopamine has a robust adhesion capability to virtually all types of surfaces. The degree of DA fouling of different carbon electrodes with different terminations was determined using cyclic voltammetry (CV) and scanning electrochemical microscopy (SECM) approach curves and imaging. The rate of electron transfer kinetics at the fouled electrode surface was determined from SECM approach curves, allowing a comparison of insulating film thickness for the different terminations. SECM imaging allowed the determination of different morphologies, such as continuous layers or islands, of insulating material. We show that heterogeneous modification of carbon electrodes with carboxyl-amine functionalities offers protection against formation of an insulating polydopamine layer, while retaining the ability to detect DA. The benefits of the heterogeneous termination are proposed to be due to the electrostatic repulsion between amino-functionalities and DA. Furthermore, we show that the conductivity of the surfaces as well as the response toward DA was recovered close to the original performance level after cleaning the surfaces for 10-20 cycles in HSO on all materials but pyrolytic carbon (PyC). The recovery capacity of the PyC electrode was lower, possibly due to stronger adsorption of DA on the surface.

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Section: Methodsmentioning

confidence: 99%

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Electrochemical Fouling of Dopamine and Recovery of Carbon Electrodes

et al. 2017

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“…In general, a G-peak at 1560 cm −1 and a D-peak at 1360 cm −1 have been observed for the various carbon materials such as metallocorroles [ 34 , 35 , 36 ], amorphous carbons [ 37 , 38 ], and graphitic materials [ 39 , 40 ]. Interestingly, G- and D-peaks were detected from our inhibition study.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Inhibition of Mild Steel and 304 Stainless Steel in 1 M Hydrochloric Acid Solution by Tea Tree Extract and Its Main Constituents

2021

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Tea tree extract, containing antioxidant constituents α-terpineol, terpinen-4-ol, and α-terpinene, has a wide range of applications in the cosmetic, food, and pharmaceutical industries. In this study, tea tree extract showed an anticorrosive effect under 1 M HCl solution on mild steel (MS) and 304 stainless steel (STS). Uniform corrosion for MS and pitting corrosion for STS at 298 K were retarded, with inhibition efficiencies of 77% and 86%, respectively. The inhibition of uniform and pitting corrosion was confirmed by scanning electron microscopy and laser scanning confocal microscopy in terms of surface roughness and pitting morphologies. The most effective constituent contributing to the inhibitory performance of tea tree extract was revealed to be α-terpineol, with an inhibition efficiency of 83%. The adsorption of tea tree extract was confirmed by surface characterization analysis using Fourier transform infrared spectroscopy, Raman spectroscopy, and Electrochemical impedance spectroscopy. Interestingly, G- and D-peaks of Raman spectra were detected from the inhibited steels, and this finding is the first example in the corrosion inhibition field. The anticorrosion mechanism can be explained by the formation of organic-Fe complexes on the corroded steel surface via electron donor and acceptor interactions in the presence of an oxygen atom of the hydroxyl group or ether of organic inhibitors.

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“…Amorphous carbon is usually doped with nitrogen to achieve higher conductivity and electrochemical activity, albeit this comes at the cost of losing some of the beneficial properties associated with diamond‐like carbon since the fraction of sp 2 ‐bonding increases with nitrogen content . Recently, however, undoped a‐C films that combine good conductivity and relatively fast electron transfer with low background current and large potential windows comparable to boron‐doped diamond (BDD) have been reported . These new types of a‐C films, also called nanocarbon films by Niwa et al., are synthesized using closed‐field unbalanced magnetron sputtering (CFUBMS) or electron cyclotron resonance (ECR) sputtering.…”

Section: Introductionmentioning

confidence: 99%

Effect of Power Density on the Electrochemical Properties of Undoped Amorphous Carbon (a‐C) Thin Films

et al. 2019

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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)63+/2+ and FcMeOH+1/0 was reversible whereas that for IrCl62−/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.

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Characterization and Electrochemical Properties of Oxygenated Amorphous Carbon (a-C) Films

Cited by 19 publications

References 23 publications

Electrochemical Fouling of Dopamine and Recovery of Carbon Electrodes

Electrochemical Fouling of Dopamine and Recovery of Carbon Electrodes

Corrosion Inhibition of Mild Steel and 304 Stainless Steel in 1 M Hydrochloric Acid Solution by Tea Tree Extract and Its Main Constituents

Effect of Power Density on the Electrochemical Properties of Undoped Amorphous Carbon (a‐C) Thin Films

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