Synthesis of graphene/methylene blue/gold nanoparticles composites based on simultaneous green reduction, in situ growth and self-catalysis

Han, Haitao; Pan, Dawei; Wu, Xuezhong; Zhang, Qing; Zhang, Haiyun

doi:10.1007/s10853-014-8179-2

Cited by 18 publications

(12 citation statements)

References 58 publications

(85 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…rGO is a two-dimensional carbon-based monolayer, it has attracted considerable attention and shown great application potentials due to its outstanding properties, such as high mechanical strength, high electrical conductivity, and versatile surface modification [28,29]. Besides, electrochemical sensors based on AuNPs have been widely used since it possesses brilliant electrical properties, large surface-to-volume ratio, high surface reaction activity, and great adsorption ability [24]. More importantly, AuNPs have shown electrochemical signals to Fe(III) in HCl electrolyte [22].…”

Section: Resultsmentioning

confidence: 99%

“…Graphene was supplied by Nanjing Jcnano Technology Company (Nanjing, China. http://www.jcnano.com/ Preparation of the rGO/MB/AuNPs composite modified electrode rGO/MB/AuNPs composite was synthesized according to the previous report in our lab [24]. rGO/MB/AuNPs composite powders were dispersed in ethanol under ultrasonication for 10 min to get a suspension (0.5 mg mL ).…”

Section: Methodsmentioning

confidence: 99%

“…Besides, the AuNPs can accelerate the electron transfer, thus increasing the sensitivity. Methylene Blue is an electron mediator full of π electrons and can avoid the aggregation of reduced graphene oxide (rGO) and increase the dispersity [23], rendering a positive role in AuNPs in situ growth on the surface and cavity of rGO [24]. A number of factors have been optimized to obtain the best analytical signal for Fe(III) and the linear response is in the concentration range of 0.3-100 μM with a detection limit of 15 nM.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Voltammetric determination of total dissolved iron in coastal waters using a glassy carbon electrode modified with reduced graphene oxide, Methylene Blue and gold nanoparticles

et al. 2014

Self Cite

View full text Add to dashboard Cite

A nanocomposite, prepared from reduced graphene oxide (rGO), Methylene Blue (MB) and gold nanoparticles (AuNPs), was used to modify a glassy carbon electrode for the determination of total dissolved iron by differential pulse voltammetry. The use of rGO warrants a larger electrode surface and the presence of more active sites, while electron transfer is accelerated by incorporating AuNPs. MB acts as an electron mediator, as an anchor for the AuNPs (which were grown in situ), and also prevents the aggregation of rGO. The modified electrode displayed a remarkably improved sensitivity and selectivity for Fe(III). The kinetics of the electrode reaction is adsorption-controlled, and the reversible process involves one proton and one electron. The response to Fe(III) is linear in the 0.3 to 100 μM concentration range, and the detection limit is 15 nM. Possible interferences by other ions were studied. The electrode was successfully applied to the determination of total dissolved iron in real coastal waters.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Voltammetric determination of total dissolved iron in coastal waters using a glassy carbon electrode modified with reduced graphene oxide, Methylene Blue and gold nanoparticles

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…UV-Visible absorption spectrum of Gr/MB composite dispersion contains the bands for both Gr and MB. After adsorption of MB on Gr sheets, main band of MB broadens, which is an indicative of high affinity of MB to Gr sheets [18,20,23,24,29,30].…”

Section: Characterization Of Gr/mb Nanocompositesmentioning

confidence: 99%

“…Mao et al studied electrochemical determination of prostate-specific antigen on Gr/MB nanocomposites [22]. Han et al tested electrochemical performance of Gr/MB/ gold nanoparticles composites and they found that it could be performed for electrochemical detection of ascorbic acid, dopamine, and uric acid [23]. Wang et al studied voltammetric behavior of NADH on Gr/MB modified Tifoil [24].…”

Section: Introductionmentioning

confidence: 99%

Amperometric Quantification of NADH Based on Graphene/Methylene Blue Nanocomposite Thin Films on Au(111)

2016

View full text Add to dashboard Cite

Graphene (Gr)/methylene blue (MB) composites were successfully prepared and amperometric detection of nicotinamide adenine dinucleotide (NADH) was studied on the Gr/MB composite thin films modified Au(111) electrode. Gr sheets were fabricated by using two-step electrochemical approaches: intercalation of sodium dodecyl sulfate (SDS) into graphite working electrode by electrooxidation and exfoliation of SDS-intercalated graphite electrode by electrochemical reduction to obtain Gr/SDS suspension. In order to prepare Gr/MB composite structure, first SDS was removed from Gr/SDS suspension and then MB was added into Gr suspension. Gr/MB dispersion was ultrasonicated, vacuum-filtered through a membrane, and then re-dispersed into water. Gr/MB nanocomposite was supported on Au(111) substrates by drop-casting of this composite dispersion. Characterization of Gr/MB composites was carried out by using scanning electron microscopy (SEM), electron dispersive spectroscopy (EDS), UV-Visible absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), and cyclic voltammetry techniques. Gr-MB/Au(111) electrode, having an excellent electrocatalytic activity, was used for amperometric determination of NADH. The oxidation current density was linearly proportional to NADH concentration in the range between 1.0 to 264 lM. The sensitivity of the sensor was calculated as 0.316 mA mM 21

show abstract

A New Approach of Controlled Single Step In Situ Fabrication of Graphene Composite Sensor for Simultaneous Sensing of Small Biomolecules in Human Urine

2019

View full text Add to dashboard Cite

A new approach is introduced to develop a nanostructured pseudo-cup-shaped 3D graphene composite (s3D-GR) on the graphite pencil electrode (GPE) surface for simultaneous sensitive sensing of small biomolecules. A pseudo-cup-shaped 3D architecture of graphene was achieved by instant composition controlled interaction of the methylene blue (MTLB) with graphene oxide. The 3D graphene architecture appeared with inner, outer, upper walls and the pseudo-cup-shaped bottom. The SEM images revealed the formation of 3D graphene network on graphite pencil electrode. 3D pseudo-cup-shaped wrinkled graphene displayed a huge electroactive surface area (2.353 cm 2 ) compared to 2D graphene (0.141 cm 2 ). The 3D graphene composite contained more electroactive sites and improved surface kinetics. The fabricated electrode surface was comprehensively evaluated by field emission scanning electron microscopy (FE-SEM), Raman spectroscopy, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). The s3D-MTLB-GR/GPE was exceptionally sensitive for dopamine (DA), uric acid (UA), l-tyrosine (Tyr) and displayed low limit of detection (LOD) 15, 27, 247 nM, respectively. The peak separation between DA-UA, UA-Tyr, and DA-Tyr were observed 140 mV, 319 mV, and 459 mV, respectively. Sensor behaved well in the presence of potential interferences and real urine sample. The pseudo-cup-shaped 3D graphene sensor can be proved a valuable tool for the simultaneous sensing of small biomolecules.[a] Dr.

show abstract

Synthesis of graphene/methylene blue/gold nanoparticles composites based on simultaneous green reduction, in situ growth and self-catalysis

Cited by 18 publications

References 58 publications

Voltammetric determination of total dissolved iron in coastal waters using a glassy carbon electrode modified with reduced graphene oxide, Methylene Blue and gold nanoparticles

Voltammetric determination of total dissolved iron in coastal waters using a glassy carbon electrode modified with reduced graphene oxide, Methylene Blue and gold nanoparticles

Amperometric Quantification of NADH Based on Graphene/Methylene Blue Nanocomposite Thin Films on Au(111)

A New Approach of Controlled Single Step In Situ Fabrication of Graphene Composite Sensor for Simultaneous Sensing of Small Biomolecules in Human Urine

Contact Info

Product

Resources

About