Chemically modified graphene and nitrogen-doped graphene: Electrochemical characterisation and sensing applications

Prathish, Krishna P.; Bârsan, Mădălina M.; Geng, Dongsheng; Sun, Xueliang; Brett, Christopher M.A.

doi:10.1016/j.electacta.2013.10.080

Cited by 71 publications

(36 citation statements)

References 37 publications

(41 reference statements)

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“…Nanomaterials, such as graphene, carbon nanotubes (CNTs), metal nanoparticles, etc., are advantageous in increasing the possibility of direct electron transfer between the enzyme active sites and the electrode, acting as electrical bridges [8][9][10]; however, direct electron transfer between enzymes and carbon nanomaterials is not always the mechanistic basis of the substrate detection [11]. Nanomaterials can also bring benefits for immobilizing enzymes since they maintain enzyme bioactivity due to their microenvironment [12,13].…”

Section: Introductionmentioning

confidence: 99%

A new self-assembled layer-by-layer glucose biosensor based on chitosan biopolymer entrapped enzyme with nitrogen doped graphene

Bârsan

David

Florescu

et al. 2014

Bioelectrochemistry

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The layer-by-layer (LbL) technique has been used for the construction of a new enzyme biosensor. Multilayer films containing glucose oxidase, GOx, and nitrogen-doped graphene (NG) dispersed in the biocompatible positively-charged polymer chitosan (chit(+)(NG+GOx)), together with the negatively charged polymer poly(styrene sulfonate), PSS(-), were assembled by alternately immersing a gold electrode substrate in chit(+)(NG+GOx) and PSS(-) solutions. Gravimetric monitoring during LbL assembly by an electrochemical quartz microbalance enabled investigation of the adsorption mechanism and deposited mass for each monolayer. Cyclic voltammetry and electrochemical impedance spectroscopy were used to characterize the LbL modified electrodes, in order to establish the contribution of each monolayer to the overall electrochemical properties of the biosensor. The importance of NG in the biosensor architecture was evaluated by undertaking a comparative study without NG in the chit layer. The GOx biosensor's analytical properties were evaluated by fixed potential chronoamperometry and compared with similar reported biosensors. The biosensor operates at a low potential of -0.2V vs., Ag/AgCl, exhibiting a high sensitivity of 10.5 μA cm(-2) mM(-1), and a detection limit of 64 μM. This study shows a simple approach in developing new biosensor architectures, combining the advantages of nitrogen-doped graphene with the LbL technique for enzyme immobilization.

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Section: Introductionmentioning

confidence: 99%

A new self-assembled layer-by-layer glucose biosensor based on chitosan biopolymer entrapped enzyme with nitrogen doped graphene

Bârsan

David

Florescu

et al. 2014

Bioelectrochemistry

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“…As seen in Figure 6A, the spectra exhibit a well-defined semicircle at the high frequency region with a larger diameter for bare GC, thus determining a R ct value two orders of magnitude greater than that of erGO-GC (Table 1). Capacitive lines appear in the low frequency region of the erGO-GC spectrum, typical behavior of a restricted diffusion within the graphene material [38,39]. Table 1.…”

Section: Fabrication and Characterisation Of Graphene Electrodesmentioning

confidence: 99%

“…The Warburg element is characterized by a diffusional time constant, a diffusional capacitance and a diffusional resistance. In the case of the erGO-GC electrode, without significant errors it was only possible to fit the spectra at the low frequency region with the addition of an extra capacitance in series with the Warburg element [38]. As seen in Figure 6A, the spectra exhibit a well-defined semicircle at the high frequency region with a larger diameter for bare GC, thus determining a R ct value two orders of magnitude greater than that of erGO-GC (Table 1).…”

Section: Fabrication and Characterisation Of Graphene Electrodesmentioning

confidence: 99%

Fabrication of high surface area graphene electrodes with high performance towards enzymatic oxygen reduction

Bari

Goñi-Urtiaga

Pita

et al. 2016

Electrochimica Acta

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These authors contributed equally to the workElectrochimica Acta 191 (2016) 500-509 ; http://dx.doi.org/10.1016/j.electacta.2016.01.101 ABSTRACT High surface area graphene electrodes were prepared by simultaneous electrodeposition and electroreduction of graphene oxide. The electrodeposition process was optimized in terms of pH and conductivity of the solution and the obtained graphene electrodes were characterized by Xray photoelectron spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy and electrochemical methods (cyclic voltammetry and impedance spectroscopy).Electrodeposited electrodes were further functionalized to carry out covalent immobilization of two oxygen-reducing multicopper oxidases: laccase and bilirubin oxidase. The enzymatic electrodes were tested as direct electron transfer based biocathodes and catalytic currents as high as 1 mA/cm 2 were obtained. Finally, the mechanism of the enzymatic oxygen reduction reaction was studied for both enzymes calculating the Tafel slopes and transfer coefficients.2

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“…Researches regarding the influence of hetero-substitution of carbonbased nanomaterials have also been extended to graphenes and nanotubes; properties like magnetism and mobility [14], sensing applications [15], electronic and optical properties [16] have been studied.…”

Section: Introductionmentioning

confidence: 99%

The influence of aza-substitution on the aromaticity of sumanene

Medeleanu¹,

Pop²,

Andoni³

et al. 2017

Studia UBB Chemia

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ABSTRACT. The influence of aza-substitution on sumanene and C52 fullerene was investigated. Various substitution patterns, derived for the structures of pyrrole, indolizine and pyridine have been proposed and aromaticity indices like HOMA, NICS, delocalization indices PDI and FLU were considered, at B3LYP/6-311+G(d) level of theory. The results outlined an enhanced aromatic character for the sumanene derivatives where similar aza-substitution patterns as encountered in pyrrole and indolizine have been considered.

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Chemically modified graphene and nitrogen-doped graphene: Electrochemical characterisation and sensing applications

Abstract: Functionalised graphene (G) and nitrogen doped graphene (NG)

Cited by 71 publications

References 37 publications

A new self-assembled layer-by-layer glucose biosensor based on chitosan biopolymer entrapped enzyme with nitrogen doped graphene

A new self-assembled layer-by-layer glucose biosensor based on chitosan biopolymer entrapped enzyme with nitrogen doped graphene

Fabrication of high surface area graphene electrodes with high performance towards enzymatic oxygen reduction

The influence of aza-substitution on the aromaticity of sumanene

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