Square voltammetric sensing of mercury at very low working potential by using oligomer-functionalized Ag@Au core-shell nanoparticles

Vilian, A.T. Ezhil; Shahzad, Aasim; Chung, Ji-Young; Choe, Soonja; Kim, Woo‐Sik; Huh, Yun Suk; Yu, Taekyung; Han, Young‐Kyu

doi:10.1007/s00604-017-2372-3

Cited by 26 publications

(6 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Affinitymentioning

confidence: 99%

“…The effects on the conductivity of biosensors due to the conformational shifts of immobilized DNA strands after bonding with metallic ions were also used for biosensing [9,72,96,98,99,102,130,141,149,150,181]. In general, the charge transfer was enhanced after the DNA binding to Cu(II) [130], Pb(II) [102,181], and Hg(II) [9,72,96,98,99,141,149,150]. On the other hand, the formation of a G-quadruplex structure with a K(I) hindered charge transfer [155,156] and led to detection limits as low as 5.0 pg L −1 for application in urine samples.…”

Section: Affinitymentioning

confidence: 99%

“…The response of the determination of Hg(II) increased up to 60% with a GNP-coated electrode compared to a bare GE [135]. The electrochemical and adsorptive coatings of GCE [98,124,133,139,158,159,167,175], SPCE [96], paper [59,76], and glass [28,92,131] sensors with GNP allowed for the immobilization of compounds via thiol bonding and higher conductivity to achieve low detection limits. The deposition of reduced graphene oxide was generally used to modify carbon-based sensors before the deposition of GNP to enhance the sensitivity due to the synergistic effect of these materials [40,135].…”

Section: Nanomaterials In Biosensing Detectionmentioning

confidence: 99%

See 2 more Smart Citations

An overview of Structured Biosensors for Metal Ions Determination

et al. 2021

View full text Add to dashboard Cite

The determination of metal ions is important for nutritional and toxicological assessment. Atomic spectrometric techniques are highly efficient for the determination of these species, but the high costs of acquisition and maintenance hinder the application of these techniques. Inexpensive alternatives for metallic element determination are based on dedicated biosensors. These devices mimic biological systems and convert biochemical processes into physical outputs and can be used for the sensitive and selective determination of chemical species such as cations. In this work, an overview of the proposed biosensors for metal ions determination was carried out considering the last 15 years of publications. Statistical data on the applications, response mechanisms, instrumentation designs, applications of nanomaterials, and multielement analysis are herein discussed.

show abstract

Section: Affinitymentioning

confidence: 99%

Section: Affinitymentioning

confidence: 99%

Section: Nanomaterials In Biosensing Detectionmentioning

confidence: 99%

See 1 more Smart Citation

An overview of Structured Biosensors for Metal Ions Determination

et al. 2021

View full text Add to dashboard Cite

show abstract

“…PEDOT:PSS could employed to avoid the restacking problem between the graphene layers. , In addition, gold–silver core–shell (Au–Ag) as a bimetallic particle has shown a synergistic effect in terms of its optical properties and electrocatalytic activity when employed as an electrode modifier . The employment of Au–Ag core–shell modified electrodes has been investigated for the quantitative detection of antimicrobial drugs, redox protein, , heavy metals, , fungicides, and antidepressants . However, to the best of our knowledge, no previous work has reported the employment of a combination between Au–Ag core–shell nanoparticles with the composite of graphene and PEDOT:PSS as a platform for electrochemical sensors.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Sensors based on Gold–Silver Core–Shell Nanoparticles Combined with a Graphene/PEDOT:PSS Composite Modified Glassy Carbon Electrode for Paraoxon-ethyl Detection

Wahyuni,

Putra,

Rahman

et al. 2024

ACS Omega

View full text Add to dashboard Cite

Herein, a nonenzymatic detection of paraoxon-ethyl was developed by modifying a glassy carbon electrode (GCE) with gold−silver core−shell (Au−Ag) nanoparticles combined with the composite of graphene with poly(3,4-ethylenedioxythiophene)/ poly(styrenesulfonate) (PEDOT:PSS). These core−shell nanoparticles (Au−Ag) were synthesized using a seed-growth method and characterized using UV−vis spectroscopy and high-resolution transmission electron microscopy (HR-TEM) techniques. Meanwhile, the structural properties, surface morphology and topography, and electrochemical characterization of the composite of Au−Ag core−shell/graphene/PEDOT:PSS were analyzed using infrared spectroscopy, field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), and electrochemical impedance spectroscopy (EIS) techniques. Moreover, the proposed sensor for paraoxon-ethyl detection based on Au−Ag core− shell/graphene/PEDOT:PSS modified GCE demonstrates good electrochemical and electroanalytical performance when investigated with cyclic voltammetry (CV), differential pulse voltammetry (DPV), and chronoamperometry techniques. It was found that the synergistic effect between Au−Ag core−shell nanoparticles and the composite of graphene/PEDOT:PSS provides a higher conductivity and enhanced electrocatalytic activity for paraoxon-ethyl detection at an optimum pH of 7. At pH 7, the proposed sensor for paraoxon-ethyl detection shows a linear range of concentrations from 0.2 to 100 μM with a limit of detection of 10 nM and high sensitivity of 3.24 μA μM −1 cm −2 . In addition, the proposed sensor for paraoxon-ethyl confirmed good reproducibility, with the possibility of being further developed as a disposable electrode. This sensor also displayed good selectivity in the presence of several interfering species such as diazinon, carbaryl, ascorbic acid, glucose, nitrite, sodium bicarbonate, and magnesium sulfate. For practical applications, this proposed sensor was employed for the determination of paraoxon-ethyl in real samples (fruits and vegetables) and showed no significant difference from the standard spectrophotometric technique. In conclusion, this proposed sensor might have a potential to be developed as a platform of electrochemical sensors for pesticide detection.

show abstract

“…In addition, their remarkable stability and easy combination with other biomaterials with low toxicity enables that the Ag/Au nanoalloys have been used for biomedical and environmental applications including protein detection, electrochemical amino acid detection, cancer therapy, and mercury ion (Hg 2+ ) detection. [ 18–23 ] In the droplets, the Au precursor was reduced in presence of the presynthesized Ag NPs, and the resultant Ag/Au nanoalloys in the aqueous phase were isolated passing through the liquid–liquid phase separator. The in‐line UV–vis absorbance spectroscopy was measured via the flow cell to identify the molar ratio of the Ag/Au nanoalloys and then they were finally collected at the outlet.…”

Section: Introductionmentioning

confidence: 99%

Total Integration of the Sample Injection, Microdroplet Reaction, Phase Separation, Real‐Time Optical Detection, and Recovery of Diverse Silver–Gold Bimetallic Nanoalloys in a Continuous Process

Bui

Kim

et al. 2020

Part & Part Syst Charact

Self Cite

View full text Add to dashboard Cite

Microfluidic droplet generators have garnered great attention due to the uniformity, high‐throughput capability, and facile experimental setup. To maximize the potentials of droplet technology as a chemical/biological nanoliter‐scale reactor, the downstream processes such as separation of the aqueous and oil phase, real‐time monitoring of the products formed in droplets, and the final product recovery from the droplets is necessary. In this study, the droplet is utilized as a chemical reactor to synthesize a variety of Ag and Au bimetallic nanoalloys in a fully integrated microsystem including sample injection, a T‐junction droplet generator, droplet reaction, water–oil phase separation, real‐time UV–vis absorbance detection, and product recovery. The flow rate of the Ag nanoparticle (NP) solution and the HAuCl4 solution was tuned to generate different molar ratios of Ag and Au components. The in‐line UV–vis absorbance spectrometer displays a peak shift of the Ag/Au bimetallic alloys depending on the molar ratio of Ag/Au in the continuous process, enabling to judge the kind of the Ag/Au alloys in situ and collect a variety of Ag/Au nanoalloys. Thus, the desired nanomaterials can be obtained with minimal trial and error, saving time and cost.

show abstract

Square voltammetric sensing of mercury at very low working potential by using oligomer-functionalized Ag@Au core-shell nanoparticles

Cited by 26 publications

References 35 publications

An overview of Structured Biosensors for Metal Ions Determination

An overview of Structured Biosensors for Metal Ions Determination

Electrochemical Sensors based on Gold–Silver Core–Shell Nanoparticles Combined with a Graphene/PEDOT:PSS Composite Modified Glassy Carbon Electrode for Paraoxon-ethyl Detection

Total Integration of the Sample Injection, Microdroplet Reaction, Phase Separation, Real‐Time Optical Detection, and Recovery of Diverse Silver–Gold Bimetallic Nanoalloys in a Continuous Process

Contact Info

Product

Resources

About