Fluorescence polarization sensor platform based on gold nanoparticles for the efficient detection of Ag (І)

This paper reports a method to enhance the electro-activity on screen printing carbon electrode (SPCE) for electrochemical sensor platform application. The method to forming uniform gold nanoparticles on reduced graphene oxide and SPCE (Au-Nps/rGO/SPCE) based on plasma-enhanced CVD process has been investigated. The results demonstrated that the Au-NPs with high density and uniform sizes were successfully introduced via CVD process where the average size and thickness are 15.9+10nm and 2.18+0.4nm respectively. A high ID/IG ratio for Au-NPs/rGO is 1.01 which 44% higher compared to GO ID/IG ratio was observed in the Raman spectrum suggesting more defective sites on the surface of Au NPS/rGO. The redox performance of Au-NPs/rGO/SPCE has also been measured and compared with rGO/SPCE and the results shown that rGO decorated with Au-NPs has a highest redox current. The peak currents of Au-NPs/rGO are significantly increased compared to the bare SPCE with increment from 0.05mA to 0.14mA. This result is proportional with the effective surface area for SPCE that has been decorated with Au-NPs/rGO where the effective area is increased from 0.126cm2 to 0.166cm2. The peak potential at 0.01V which was found to shift up to 0.4V as the scan rate increases suggested that reaction is electrochemically reversible.

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Highly Sensitive Detection of Mercury(II) Ions by Fluorescence Polarization Enhanced by Gold Nanoparticles

Angewandte Chemie International Edition ◽

10.1002/anie.200803069 ◽

2008 ◽

Vol 47 (44) ◽

pp. 8386-8389 ◽

Cited By ~ 317

Author(s):

Bang-Ce Ye ◽

Bin-Cheng Yin

Keyword(s):

Gold Nanoparticles ◽

Fluorescence Polarization ◽

Sensitive Detection ◽

Highly Sensitive ◽

Highly Sensitive Detection

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Development of Paper Biosensor for the Detection of Phenol from Industrial Effluents Using Bioconjugate of Tyr-AuNps Mediated by Novel IsolateStreptomyces tuirusDBZ39

Journal of Nanomaterials ◽

10.1155/2017/1352134 ◽

2017 ◽

Vol 2017 ◽

pp. 1-8 ◽

Cited By ~ 6

Author(s):

Bi Bi Zainab Mazhari ◽

Dayanand Agsar ◽

M. V. N. Ambika Prasad

Keyword(s):

Gold Nanoparticles ◽

Industrial Effluents ◽

Cost Effective ◽

Paper Strip ◽

Phenolic Pollutants ◽

Efficient Detection ◽

Specific Catalytic Activity ◽

Phenolic Constituents ◽

Different Types ◽

Filter Papers

Paper biosensor was developed using Tyr-AuNps bioconjugate produced byStreptomycesfor the detection of phenol from the effluent of wine, paper, and plastic industries. Among three filter papers assessed, Whatman number 2 filter paper was proved to be the best paper base for the development of biosensor. Tyrosinase and gold nanoparticles being produced by a single novel isolateStreptomyces tuirusDBZ39 proved to be efficient bioconjugate for the detection of phenol constituents, due to its biocompatibility. The substrate specific catalytic activity of the tyrosinase and unique Surface Plasmon Resonance attribute of gold nanoparticles are the cause for efficient detection of phenol constituents from the effluent of wine, paper, and plastic industries in 3 min. The different types and quantity of phenolic constituents in various industrial effluents, such as phenol in wine, dopamine in paper, and catechol in plastic effluents, were accurately detected by the bioconjugate. The efficacy of tyrosinase in the detection of phenol constituents was expected to be enhanced by the gold nanoparticles because of their electron, optical, and magnetic properties. This novel paper strip biosensor could be cost-effective and efficient means of future devices for the detection of phenolic pollutants from any environmental samples.

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A Porphyrin Molecularly Imprinted Biomimetic Electrochemical Sensor Based on Gold Nanoparticles and Carboxyl Graphene Composite for the Highly Efficient Detection of Methyl Parathion

NANO ◽

10.1142/s1793292017500461 ◽

2017 ◽

Vol 12 (04) ◽

pp. 1750046 ◽

Cited By ~ 5

Author(s):

Bin He ◽

Ya-Li Mao ◽

Ya Zhang ◽

Wei Yin ◽

Chang-Jun Hou ◽

...

Keyword(s):

Gold Nanoparticles ◽

Methyl Parathion ◽

Dynamic Range ◽

Limit Of Detection ◽

Differential Pulse ◽

Molecularly Imprinted ◽

Zinc Porphyrin ◽

Efficient Detection ◽

Novel Strategy ◽

Biomimetic Sensor

A highly sensitive and selective biomimetic sensor based on zinc porphyrin molecularly imprinted Polymer microspheres (MIPMs), gold nanoparticles (AuNPs) and carboxyl graphene (CG) nanomaterials was successfully developed for direct electrochemical detection of methyl parathion (MP). The novel strategy emphasized the fabrication of a porphyrin zinc-based sensor via attaching MIPMs on AuNPs/CG nanocomposites. MIPMs was prepared by free radical polymerization using MP as the template, Zinc porphyrin as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as the cross-linking reagent and azobisisobutyronitrile (AIBN) as the initiator. The introduction of AuNPs/CG significantly increased the effective electrode area, and amplified the sensor signal. The modified electrode was characterized by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The parameters of the detection process were also optimized. The biomimetic sensor exhibits a much wider linear dynamic range between 1.0[Formula: see text][Formula: see text][Formula: see text]10[Formula: see text][Formula: see text]mol L[Formula: see text] and 8.0[Formula: see text][Formula: see text][Formula: see text]10[Formula: see text][Formula: see text]mol L[Formula: see text] and the limit of detection (LOD) down to 3.16[Formula: see text][Formula: see text][Formula: see text]10[Formula: see text][Formula: see text]mol L[Formula: see text] based on S/N [Formula: see text] 3. The sensor had good reproducibility, stability and selectivity for MP detection. The developed sensor was successfully employed for the detection of MP in real samples.

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