Spatial Architecture of Modified Carbon Nanotubes/Electrochemically Reduced Graphene Oxide Nanomaterial for Fast Electron Transfer. Application in Glucose Biosensor

2019 ◽  
Vol 31 (5) ◽  
pp. 981-990 ◽  
Author(s):  
Katarzyna Jakubow‐Piotrowska ◽  
Barbara Kowalewska
Keyword(s):  
Carbon Nanotubes ◽  
Electron Transfer ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Fast Electron ◽  
Glucose Biosensor ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide ◽  
Modified Carbon Nanotubes ◽  
Spatial Architecture

Fabrication of a novel disposable glucose biosensor using an electrochemically reduced graphene oxide–glucose oxidase biocomposite

2016 ◽  
Vol 8 (38) ◽  
pp. 6974-6981 ◽  
Author(s):  
Kathiresan Vijayaraj ◽  
Suck Won Hong ◽  
Sung-Ho Jin ◽  
Seung-Cheol Chang ◽  
Deog-Su Park
Keyword(s):  
Graphene Oxide ◽  
Glucose Oxidase ◽  
Reduced Graphene Oxide ◽  
Electrochemical Method ◽  
Graphite Electrode ◽  
Cost Effective ◽  
Glucose Biosensor ◽  
Pencil Graphite Electrode ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

A disposable glucose biosensor has been fabricated on the surface of a cost-effective pencil graphite electrode (PGE) by an electrochemical method, using glucose oxidase (GOx) and reduced graphene oxide (rGO).

scholarly journals Simultaneous Detection of Dihydroxybenzene Isomers Using Electrochemically Reduced Graphene Oxide-Carboxylated Carbon Nanotubes/Gold Nanoparticles Nanocomposite

Biosensors ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 321
Author(s):  
Angélica Domínguez-Aragón ◽  
Rocio B. Dominguez ◽  
Erasto Armando Zaragoza-Contreras
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Tap Water ◽  
Simultaneous Detection ◽  
3D Network ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide ◽  
Carboxylated Carbon Nanotubes

An electrochemical sensor based on electrochemically reduced graphene oxide (ErGO), carboxylated carbon nanotubes (cMWCNT), and gold nanoparticles (AuNPs) (GCE/ErGO-cMWCNT/AuNPs) was developed for the simultaneous detection of dihidroxybenzen isomers (DHB) hydroquinone (HQ), catechol (CC), and resorcinol (RS) using differential pulse voltammetry (DPV). The fabrication and optimization of the system were evaluated with Raman Spectroscopy, SEM, cyclic voltammetry, and DPV. Under optimized conditions, the GCE/ErGO-cMWCNT/AuNPs sensor exhibited a linear concentration range of 1.2–170 μM for HQ and CC, and 2.4–400 μM for RS with a detection limit of 0.39 μM, 0.54 μM, and 0.61 μM, respectively. When evaluated in tap water and skin-lightening cream, DHB multianalyte detection showed an average recovery rate of 107.11% and 102.56%, respectively. The performance was attributed to the synergistic effects of the 3D network formed by the strong π–π stacking interaction between ErGO and cMWCNT, combined with the active catalytic sites of AuNPs. Additionally, the cMWCNT provided improved electrocatalytic properties associated with the carboxyl groups that facilitate the adsorption of the DHB and the greater amount of active edge planes. The proposed GCE/ErGO-cMWCNT/AuNPs sensor showed a great potential for the simultaneous, precise, and easy-to-handle detection of DHB in complex samples with high sensitivity.

scholarly journals Oxygen reduction reaction by electrochemically reduced graphene oxide

2014 ◽  
Vol 173 ◽  
pp. 415-428 ◽  
Author(s):  
Santosh Kumar Bikkarolla ◽  
Peter Cumpson ◽  
Paul Joseph ◽  
Pagona Papakonstantinou
Keyword(s):  
Electron Transfer ◽  
Graphene Oxide ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Reduction Reaction ◽  
Potential Range ◽  
X Ray ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

We show that a partially reduced graphene oxide electrocatalyst, synthesized by electrochemical reduction of graphene oxide (GO), displays significantly enhanced catalytic activity towards the oxygen reduction reaction (ORR) in alkaline solutions compared to the starting GO. The electrochemical partial reduction of GO was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy. Electrochemical impedance spectroscopy (EIS) verified the enhanced electron transfer ability of the electrochemically reduced graphene oxide (ErGO) compared to GO. The resultant ErGO electrode showed enhanced capacitance and an ORR onset potential of −0.11 V vs. Ag/AgCl, similar to that of a nitrogen doped reduced graphene oxide (NrGO) electrode produced by a hydrothermal process. However the ErGO exhibited considerably lower electron transfer numbers (2.0–3.3 at a potential range of −0.4 V to −1.0 V) indicating that although both catalysts operate under combined 4e− and 2e− ORR processes, ErGO follows a more predominant 2e− pathway. The ORR process in ErGO has been linked to the presence of quinone functional groups, which favour the 2e− ORR pathway.

Sign in / Sign up

Export Citation Format

Share Document