Direct electrochemistry of catalase at amine-functionalized graphene/gold nanoparticles composite film for hydrogen peroxide sensor

Huang, Ke‐Jing; Niu, De-Jun; Li, Xue; Wu, Zeyi; Fan, Yang; Chang, Yafang; Wu, Yingying

doi:10.1016/j.electacta.2010.12.094

Cited by 179 publications

(87 citation statements)

References 37 publications

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“…The carbon atom that is directly bonded to the group sticks out from the graphene sheet. We get very good agreement with existing experimental data [6,7], and other theoretical calculations [3][4][5].…”

Section: Resultssupporting

confidence: 79%

“…Since quantitatively this effect is rather unknown, we have undertaken theoretical studies of this issue. Some aspects of the cohesion in functionalized graphene monolayers have been studied previously [3][4][5][6][7]. We have performed extensive studies of the stability and electronic properties of the functionalized graphene with various molecular groups.…”

Section: Introductionmentioning

confidence: 99%

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Structural and Electronic Properties of Functionalized Graphene

2011

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In the present paper, we study the effects of functionalization of graphene with simple organic molecules OH, and NH 2 , focusing on the stability and band gaps of the structures. We have performed DFT calculations for graphene supercells with various numbers of the attached molecules. We have determined adsorption energies of the functionalized graphene mono-and bilayers, the changes in the geometry, and the band structure. We observe the characteristic effects such as rehybridization of the bonds induced by fragments attached to graphene and opening of the graphene band gap by functionalization. We have also studied the dependence of the adsorption energies of the functionalized graphene on the density of the adsorbed molecules. Our calculations reveal that the -OH and -NH 2 groups exhibit the strong cohesion to graphene layers. Further, we determine the critical density of the OH fragments which lead to the opening of the band gap. We also show how to engineer the magnitude of the band gap by functionalizing graphene with NH 2 groups of various concentrations.

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Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Structural and Electronic Properties of Functionalized Graphene

2011

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“…Among these techniques, electrochemical methods have attracted extensive attention due to their relative instrumental simplicity, low cost, high sensitivity, portability, efficiency, and real-time detection capability [6]. For instance, electrochemical sensors based on enzymes such as horseradish peroxidase [7], catalase [8], cytochrome c [9], and hemoglobin [10] show high selectivity and sensitivity for H 2 O 2 determination. However, enzymebased sensors are unstable, are relatively expensive to manufacture, require complicated immobilization procedures, and are highly sensitive to environmental conditions [11].…”

Section: Introductionmentioning

confidence: 99%

Nonenzymatic electrochemical sensing of hydrogen peroxide based on a polyaniline-MnO2 nanofiber-modified glassy carbon electrode

Lee

Hong

2015

J Appl Electrochem

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We report the synthesis of polyaniline-manganese dioxide (PANI-MnO 2 ) nanofibers and their applications as nonenzymatic electrochemical sensors for the determination of hydrogen peroxide (H 2 O 2 ). The PANIMnO 2 nanofibers were synthesized via a one-step mixing process from the as-prepared PANI nanofiber aqueous dispersion and the aqueous solution of KMnO 4 . The morphology and chemical composition of the synthesized PANI-MnO 2 nanofibers were characterized by field-emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy, and X-ray diffraction. A facile electrochemical hydrogen peroxide sensor based on a PANI-MnO 2 -modified glassy carbon electrode (PANI-MnO 2 /GCE) was fabricated by a drop-casting method, and its electrochemical behavior was investigated using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and amperometry. The results clearly exhibited good electrocatalytic activity of the PANI-MnO 2 /GCE toward H 2 O 2 reduction in pH 7.4 phosphate buffer solution (PBS). The nonenzymatic H 2 O 2 sensor displayed a wide linear range (5-50 lM and 0.05-10 mM), low detection limit (0.8 lM at S/N = 3), high sensitivity (403.3 lA mM -1 cm -2 ), and negligible interference from ascorbic acid, uric acid, L-cysteine, and glucose at an applied detection potential of -0.4 V (vs. Ag/AgCl).

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“…This method, however, often lacks fine control over the size, uniformity and density of AuNPs on the GO sheets in the reaction process. 108 AuNPs can be decorated to GO surface based on NH-Au binding 109 or SH-Au binding. 110 DNA 111 and proteins 112 have been also used as the molecular linkers between AuNPs and GO.…”

Section: +mentioning

confidence: 99%

Applications of gold nanoparticles in medicine and therapy

Madkour¹

2018

PPIJ

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The stability and dispersity of AuNMs in solution play a key role for the many applications. Most inorganic nanomaterials are not well dispersed in physiological buffers and require function-alization by thiols or surfactants to offer the stabilization forces. Furthermore, sufficient blood circulation time is critical for both imaging and in vivo drug delivery. Localized surface Plasmon resonance (LSPR) is one of the most significant features of AuNMs. The AuNMs as reporters have been broadly applied into lateral flow immunechromatographicalassay (LFICA) and enzyme-linked immunosorbent assay (ELISA), which is a well-established technology for analysis of the target analytes in food safety, clinical diagnosis, environmental monitoring, and medical science and so on. Au based nanomaterials (AuNMs) are known to possess many attractive features such as unique electrical, optical and catalytic properties as well as excellent biocompatibility. In this review, we summarize the current advancement on application of AuNMs in analytical sciences based on their local surface plasmon resonance, fluorescence and electrochemistry properties. AuNMs based imaging and therapy in biomolecules is explained. As one of the most reliable imaging modes, computed tomography (CT), X-ray and SERS imaging has been widely used owing to its high spatial and density resolution. We end the review by a discussion of the conjugation between gold nanoparticles with other kinds of nanoparticles such as other metals and carbon nano structures. Finally, future development in this research area is also prospected.

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Direct electrochemistry of catalase at amine-functionalized graphene/gold nanoparticles composite film for hydrogen peroxide sensor

Cited by 179 publications

References 37 publications

Structural and Electronic Properties of Functionalized Graphene

Structural and Electronic Properties of Functionalized Graphene

Nonenzymatic electrochemical sensing of hydrogen peroxide based on a polyaniline-MnO2 nanofiber-modified glassy carbon electrode

Applications of gold nanoparticles in medicine and therapy

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