Correlation of film structure and molecular oxygen reduction at nitrogen doped amorphous carbon thin film electrochemical electrodes

Zeng, Aiping; Bilek, M.M.M.; McKenzie, David R.; Lay, Peter A.

doi:10.1016/j.diamond.2009.02.013

Cited by 11 publications

(14 citation statements)

References 49 publications

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“…For glassy carbon electrodes, H 2 O 2 reduction normally takes place at larger negative overpotentials. 57 Catalytic H 2 O 2 reduction to H 2 O in the potential region used in our experiment was also reported in studies employing nitrogen-doped amorphous carbon (a-C:N) thin films, 57 nitrogen-doped graphene, 58 and carbon nanotube electrodes. 59 It is widely accepted that measurement of the liberated H 2 O 2 from enzymatic reactions at a low cathodic region is preferred over that at an anodic potential region in order to minimize the interference of other electroactive compounds.…”

Section: ■ Results and Discussionsupporting

confidence: 76%

“…A moderate cathodic potential was used in our system to observe the reduction of H 2 O 2 , opposed to an anodic potential at +0.6 V (vs Ag/AgCl) employed to detect oxidation of H 2 O 2 in first-generation glucose biosensors. For glassy carbon electrodes, H 2 O 2 reduction normally takes place at larger negative overpotentials . Catalytic H 2 O 2 reduction to H 2 O in the potential region used in our experiment was also reported in studies employing nitrogen-doped amorphous carbon (a-C:N) thin films, nitrogen-doped graphene, and carbon nanotube electrodes .…”

Section: Resultssupporting

confidence: 65%

“…At the cathodic potential used in our measurement, O 2 reduction reaction is assumed to have a very small contribution to the measured current according to the preceding analysis of the CV result in Figure a, line 3. The catalytic function for H 2 O 2 reduction to H 2 O on DLC electrodes can possibly be attributed to the dissociation of C–O bonds on sp 2 carbon sites at the electrode surface . The nature of C–O bonding is complicated since oxygen adsorption can result in various types of functional groups on amorphous carbon.…”

Section: Resultsmentioning

confidence: 99%

“…A large variation of the adsorption energies can be expected from surface C–O species . The proposed model for catalytic reduction of hydrogen peroxide at the DLC electrode involves the following steps: The release of O from C–O bonds leads to an open site for H 2 O 2 adsorption . The cleavage of the O–O bond in H 2 O 2 splits the peroxide molecule into OH radicals which are then reduced to H 2 O .…”

Section: Resultsmentioning

confidence: 99%

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Diamond-Like Carbon Thin Film Electrodes for Microfluidic Bioelectrochemical Sensing Platforms

et al. 2020

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This work aims to utilize diamond-like carbon (DLC) thin films for bioreceptor immobilization and amperometric biosensing in a microfluidic platform. A specific RF-PECVD method was employed to prepare DLC thin film electrodes with desirable surface and bulk properties. The films possessed a relatively high sp2 fraction, a moderate electrical conductivity (7.75 × 10–3 S cm–1), and an optical band gap of 1.67 eV. X-ray photoelectron spectroscopy (XPS) and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy revealed a presence of oxygen-containing functional groups on the DLC surface. The DLC electrodes were integrated into polydimethylsiloxane (PDMS) microfluidic electrochemical cells with the channel volume of 2.24 μL. Glucose oxidase (GOx) was chosen as a model bioreceptor to validate the employment of DLC electrodes for bioelectrochemical sensing. In-channel immobilization of glucose oxidase (GOx) at the DLC surface was realized through carbodiimide covalent linkages. Enzyme bound DLC electrode was confirmed with the redox potential at around −79 mV vs NHE in 0.1 M phosphate buffer pH 7.4. Amperometric flow-injection glucose sensing at a potential of −0.45 V vs Ag in the absence of standard redox mediators showed the increase of current response upon increasing the glucose concentration. The sensing mechanism is based on the reduction process of H2O2 liberated from the enzymatic activity. The proposed model for the catalytic H2O2 reduction to H2O on DLC electrodes was attributed to the dissociation of C–O bonds at the DLC surface.

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Section: ■ Results and Discussionsupporting

confidence: 76%

Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Diamond-Like Carbon Thin Film Electrodes for Microfluidic Bioelectrochemical Sensing Platforms

et al. 2020

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“…Nitrogen-doped amorphous carbon (a-C:N) has recently attracted attention and been investigated as electrode materials. It has been shown that a-C:N has a wide potential window and low back current in aqueous media that are comparable with those observed at the BDD electrode [3][4][5][6][7][8][9][10][11]. The methods employed for fabricating a-C:N electrodes were a filtered cathodic vacuum arc (FCVA) [3][4][5][6][7][8], radio-frequency cathodic sputtering from graphite target [9,10], and direct ion beam deposition [11].…”

Section: Introductionmentioning

confidence: 99%

Controllable Electrochemical Activities by Oxidative Treatment toward Inner-Sphere Redox Systems at N-Doped Hydrogenated Amorphous Carbon Films

Tanaka

Naragino

Yoshinaga

et al. 2012

International Journal of Electrochemistry

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The electrochemical activity of the surface of Nitrogen-doped hydrogenated amorphous carbon thin films (a-CNH, N-doped DLC) toward the inner sphere redox species is controllable by modifying the surface termination. At the oxygen plasma treated N-doped DLC surface (O-DLC), the surface functional groups containing carbon doubly bonded to oxygen (C=O), which improves adsorption of polar molecules, were generated. By oxidative treatment, the electron-transfer rate for dopamine (DA) positively charged inner-sphere redox analyte could be improved at the N-doped DLC surface. For redox reaction of 2,4-dichlorophenol, which induces an inevitable fouling of the anode surface by forming passivating films, the DLC surfaces exhibited remarkably higher stability and reproducibility of the electrode performance. This is due to the electrochemical decomposition of the passive films without the interference of oxygen evolution by applying higher potential. The N-doped DLC film can offer benefits as the polarizable electrode surface with the higher reactivity and higher stability toward inner-sphere redox species. By making use of these controllable electrochemical reactivity at the O-DLC surface, the selective detection of DA in the mixed solution of DA and uric acid could be achieved.

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Semiconductor properties and redox responses at a-C:N thin film electrochemical electrodes

Zeng

Bilek

McKenzie

et al. 2009

Diamond and Related Materials

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Correlation of film structure and molecular oxygen reduction at nitrogen doped amorphous carbon thin film electrochemical electrodes

Cited by 11 publications

References 49 publications

Diamond-Like Carbon Thin Film Electrodes for Microfluidic Bioelectrochemical Sensing Platforms

Diamond-Like Carbon Thin Film Electrodes for Microfluidic Bioelectrochemical Sensing Platforms

Controllable Electrochemical Activities by Oxidative Treatment toward Inner-Sphere Redox Systems at N-Doped Hydrogenated Amorphous Carbon Films

Semiconductor properties and redox responses at a-C:N thin film electrochemical electrodes

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