Graphene based nanomaterials as chemical sensors for hydrogen peroxide – A comparison study of their intrinsic peroxidase catalytic behavior

Pogăcean, Florina; Socaci, Crina; Pruneanu, Stela; Biriş, Alexandru R.; Coroș, Maria; Măgeruşan, Lidia; Katona, Gabriel; Turcu, Rodica; Borodi, Gheorghe

doi:10.1016/j.snb.2015.02.124

Cited by 103 publications

(39 citation statements)

References 41 publications

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“…8-hydroxy-2'-deoxyguanosine (8-OHdG) was purchased from the Cayman Chemical Company. For the synthesis of nitrogen-doped graphene the following chemicals were used: graphene oxide, prepared using a modified Hummers method as previously reported [42], and urea (Alfa-Aesar, Germany).…”

Section: Chemicals and Materialsmentioning

confidence: 99%

Nitrogen-Doped Graphene: The Influence of Doping Level on the Charge-Transfer Resistance and Apparent Heterogeneous Electron Transfer Rate

Coroș

Varodi

Pogăcean

et al. 2020

Sensors

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Three nitrogen-doped graphene samples were synthesized by the hydrothermal method using urea as doping/reducing agent for graphene oxide (GO), previously dispersed in water. The mixture was poured into an autoclave and placed in the oven at 160 °C for 3, 8 and 12 h. The samples were correspondingly denoted NGr-1, NGr-2 and NGr-3. The effect of the reaction time on the morphology, structure and electrochemical properties of the resulting materials was thoroughly investigated using scanning electron microscopy (SEM) Raman spectroscopy, X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), elemental analysis, Cyclic Voltammetry (CV) and electrochemical impedance spectroscopy (EIS). For NGr-1 and NGr-2, the nitrogen concentration obtained from elemental analysis was around 6.36 wt%. In the case of NGr-3, a slightly higher concentration of 6.85 wt% was obtained. The electrochemical studies performed with NGr modified electrodes proved that the charge-transfer resistance (Rct) and the apparent heterogeneous electron transfer rate constant (Kapp) depend not only on the nitrogen doping level but also on the type of nitrogen atoms found at the surface (pyrrolic-N, pyridinic-N or graphitic-N). In our case, the NGr-1 sample which has the lowest doping level and the highest concentration of pyrrolic-N among all nitrogen-doped samples exhibits the best electrochemical parameters: a very small Rct (38.3 Ω), a large Kapp (13.9 × 10−2 cm/s) and the best electrochemical response towards 8-hydroxy-2′-deoxyguanosine detection (8-OHdG).

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Section: Chemicals and Materialsmentioning

confidence: 99%

Nitrogen-Doped Graphene: The Influence of Doping Level on the Charge-Transfer Resistance and Apparent Heterogeneous Electron Transfer Rate

Coroș

Varodi

Pogăcean

et al. 2020

Sensors

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“…The first prepared graphene “thermally reduced graphene oxide” (TRGO) form, containing about 2–3% AgNPs in composition, was obtained by simultaneous thermal reduction of GO and of AgNO 3 , 15 min at 300°C, under Ar flow …”

Section: Methodsmentioning

confidence: 99%

Graphene/silver nanoparticles‐based surface‐enhanced Raman spectroscopy detection platforms: Application in the study of DNA molecules at low pH

Muntean

Dina

Coroș

et al. 2019

J Raman Spectroscopy

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The aim of this work is to develop a surface‐enhanced Raman spectroscopy (SERS)‐active platform based on a mixture of graphene/Ag nanocomposite and a silver colloid for biomedical applications and to test it in the case of DNA molecules at low pH. Graphene/silver nanocomposites were synthesized by the reduction process and were characterized by transmission electron microscopy, X‐ray powder diffraction patterns, and thermogravimetric analysis. The following graphene/Ag composites were prepared: (a) “thermally reduced graphene oxide” (TRGO), containing about 2–3% silver nanoparticles (AgNPs); (b) TRGO 1 (graphene with crowded AgNPs 20%); and (c) TRGO 2 (graphene with ordered AgNPs 20%). Different mixtures of these systems with a silver colloid were tested not only by ultraviolet‐visible spectrophotometry but also by SERS in the presence of the test substance crystal violet. Moreover, the time stability of the mixtures of graphene/AgNPs composite (TRGO 1) with the silver colloid was tested for crystal violet. Based on these results, the platform with the best SERS enhancement properties was selected for DNA analyses at low pH values. Chemical stability under acidic conditions has been found for nucleic acid systems, in the presence of graphene/crowded AgNPs 20% and silver colloid. This chemical stability has been discussed considering a hydracid catalyzed electrophilic hydration reaction mechanism characteristic to the trans‐1,3‐butadiene‐type building moieties from graphene.

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“…21 Next, urea (2.4 g) was added and the resulting homogeneous solution was stirred at 160 C for 8 hours. The black suspension was ltered, washed with plenty of water and dried at room temperature overnight.…”

Section: Preparation Of Graphene-metal Nanoparticles Compositesmentioning

confidence: 99%

New nanocomposite-graphene pastes based stochastic microsensors

et al. 2015

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Three new stochastic sensors based on metal nanocomposites-graphene pastes modified with protoporphyrin-IX were designed. PPAR-g was chosen as model analyte to prove the stochastic behavior of the sensors. The sensor based on PIX/graphene-Au-3 showed the highest sensitivity for the assay of PPAR-g (1.94 Â 10 7 s À1 g L À1 ) and the lowest determination limit (20 pg mL À1 ). The sensors were stable for more than three months (RSD values of their sensitivity did not exceeded 1.0%). They could be reliably used for the assay of PPAR-g in cerebrospinal liquid with recovery values higher than 97.0%.

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Graphene based nanomaterials as chemical sensors for hydrogen peroxide – A comparison study of their intrinsic peroxidase catalytic behavior

Cited by 103 publications

References 41 publications

Nitrogen-Doped Graphene: The Influence of Doping Level on the Charge-Transfer Resistance and Apparent Heterogeneous Electron Transfer Rate

Nitrogen-Doped Graphene: The Influence of Doping Level on the Charge-Transfer Resistance and Apparent Heterogeneous Electron Transfer Rate

Graphene/silver nanoparticles‐based surface‐enhanced Raman spectroscopy detection platforms: Application in the study of DNA molecules at low pH

New nanocomposite-graphene pastes based stochastic microsensors

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