Photoelectrochemical sensing for hydroquinone based on porphyrin-functionalized Au nanoparticles on graphene

Hu, Yaqi; Zhang, Xue; He, Haibin; Ai, Ruixia; Liu, Xiuhui; Lu, Xiaoquan

doi:10.1016/j.bios.2013.02.034

Cited by 78 publications

(41 citation statements)

References 37 publications

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“…After Au was introduced, a new peak appears at 284.2 eV and this peak is attributed to the C—N—Au bond 26, 27, 28. After peak‐differentiation‐imitating analysis, the Au 4f doublet deconvolutes into two pairs of peaks, which correspond to the reduced Au (0) at 84.27 eV in Au 4f 7/2 and at 87.94 eV in Au 4f 5/2 , Au (III) ions at 85.02 eV in Au 4f 7/2 and Au (I) ions at 88.37 eV in Au 4f 5/2 , respectively 29. Approximately 0.6 eV redshift of the XPS peak of Au (0) ions exists in Au 4f 7/2 .…”

Section: Resultsmentioning

confidence: 99%

Experimental Sensing and Density Functional Theory Study of H₂S and SOF₂ Adsorption on Au‐Modified Graphene

et al. 2015

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A gas sensor is used to detect SF6 decomposed gases, which are related to insulation faults, to accurately assess the insulated status of electrical equipment. Graphene films (GrF) modified with Au nanoparticles are used as an adsorbent for the detection of H2S and SOF2, which are two characteristic products of SF6 decomposed gases. Sensing experiments are conducted at room temperature. Results demonstrate that Au‐modified GrF yields opposite responses to the tested gases and is thus considered a promising material for developing H2S‐ and SOF2‐selective sensors. The first‐principles approach is applied to simulate the interaction between the gases and Au‐modified GrF systems and to interpret experimental data. The observed opposite resistance responses can be attributed to the charge‐transfer differences related to the interfacial interaction between the gases and systems. The density of states and Mulliken population analysis results confirm the apparent charge transfer in Au‐modified GrF chemisorption, whereas the van der Waals effect dominates the pristine graphene adsorption systems. Calculation results can also explicate the significant SOF2 responses on Au‐modified GrF. This work is important in graphene modulation and device design for selective detection.

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Section: Resultsmentioning

confidence: 99%

Experimental Sensing and Density Functional Theory Study of H₂S and SOF₂ Adsorption on Au‐Modified Graphene

et al. 2015

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“…Au-decorated Graphene films (GrF) was synthesized through the following chemical reduction procedure [23]: carboxyl functionalized graphene (1 mg) was dispersed in 5 mL HAuCl 4 (1 mM) solution as precursor under constant sonication for 40 min to reach a stable colloid state; 5 mL NaBH 4 (40 mM) solution was added dropwise to the above colloid mixed solution with vigorous stirring for 30 min; centrifugal separation step was then followed; the resulting products were collected and washed with distilled water for several times; and were finally dried in a vacuum oven at 60 C for 12 h to obtain the Au-doped GrF. Au-doped GrF powders (5 mg) were dispersed ultrasonically in 200 mL DMF solution for 30 min to reach a relatively good dispersibility.…”

Section: Preparation Methods Of Au-decorated Graphenementioning

confidence: 99%

Application of Graphene Gas Sensors in Online Monitoring of SF6 Insulated Equipment

Zhang¹,

Tang²,

Xiao³

et al. 2017

Nanomaterials Based Gas Sensors for SF6 Decomposition Components Detection

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Graphene is an allotrope of carbon apart from graphite, diamond, fullerene and carbon nanotubes. Because graphene has unique mechanical, structural, thermal and electrochemical properties and can present the stability characteristics of these features, it becomes two-dimensional (2-d) materials which can alter three-dimensional (3-d) carbon nanotubes composite materials and has important research value. Pristine graphene and graphene films doped with Au nanoparticles were synthesized by the chemical reduction method. Their corresponding gas sensors were both fabricated by the traditional drop coating method and then used as an adsorbent for the detection of H 2 S, SO 2 , SOF 2 and SO 2 F 2 at room temperature. Theoretical simulation was also investigated when the decomposed gaseous components of sulfur hexafluoride (SF 6), namely, H 2 S, SO 2 , SOF 2 and SO 2 F 2 , were adsorbed on pristine and Au-embedded graphene based on DFT. In order to interpret the adsorption processes between Au-doped graphene and gas molecules, this chapter discussed the charge transfer mechanism on the adsorption surface for further investigation.

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“…The porphyrin decorated AuNP/graphene nanocomposite demonstrated good photoelectrochemical responses for oxidation of HQ, owing to the excellent electrical conductivity of graphene and the ability of AuNPs in capturing and transporting the photo excited electrons. A detection limit as low as 4.6 nM was achieved by this approach toward HQ detection [187]. In another recent report, enzymatic PEC biosensor was developed toward H 2 O 2 detection.…”

Section: The Functions Of Mnps In Various Biosensor Typesmentioning

confidence: 99%

Noble metal nanoparticles in biosensors: recent studies and applications

Malekzad

Zangabad

Mirshekari

et al. 2017

Nanotechnology Reviews

287

119

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The aim of this review is to cover advances in noble metal nanoparticle (MNP)-based biosensors and to outline the principles and main functions of MNPs in different classes of biosensors according to the transduction methods employed. The important biorecognition elements are enzymes, antibodies, aptamers, DNA sequences, and whole cells. The main readouts are electrochemical (amperometric and voltametric), optical (surface plasmon resonance, colorimetric, chemiluminescence, photoelectrochemical, etc.) and piezoelectric. MNPs have received attention for applications in biosensing due to their fascinating properties. These properties include a large surface area that enhances biorecognizers and receptor immobilization, good ability for reaction catalysis and electron transfer, and good biocompatibility. MNPs can be used alone and in combination with other classes of nanostructures. MNP-based sensors can lead to significant signal amplification, higher sensitivity, and great improvements in the detection and quantification of biomolecules and different ions. Some recent examples of biomolecular sensors using MNPs are given, and the effects of structure, shape, and other physical properties of noble MNPs and nanohybrids in biosensor performance are discussed.

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Photoelectrochemical sensing for hydroquinone based on porphyrin-functionalized Au nanoparticles on graphene

Cited by 78 publications

References 37 publications

Experimental Sensing and Density Functional Theory Study of H₂S and SOF₂ Adsorption on Au‐Modified Graphene

Experimental Sensing and Density Functional Theory Study of H₂S and SOF₂ Adsorption on Au‐Modified Graphene

Application of Graphene Gas Sensors in Online Monitoring of SF6 Insulated Equipment

Noble metal nanoparticles in biosensors: recent studies and applications

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Photoelectrochemical sensing for hydroquinone based on porphyrin-functionalized Au nanoparticles on graphene

Cited by 78 publications

References 37 publications

Experimental Sensing and Density Functional Theory Study of H2S and SOF2 Adsorption on Au‐Modified Graphene

Experimental Sensing and Density Functional Theory Study of H2S and SOF2 Adsorption on Au‐Modified Graphene

Application of Graphene Gas Sensors in Online Monitoring of SF6 Insulated Equipment

Noble metal nanoparticles in biosensors: recent studies and applications

Contact Info

Product

Resources

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Experimental Sensing and Density Functional Theory Study of H₂S and SOF₂ Adsorption on Au‐Modified Graphene

Experimental Sensing and Density Functional Theory Study of H₂S and SOF₂ Adsorption on Au‐Modified Graphene