A one-pot synthesis of colloidal Ag–Au nanoparticles with controlled composition

Шевченко, Г. П.; Zhuravkov, V. A.; Shishko, Galina V.

doi:10.1007/s42452-019-1143-7

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…e electroactivity of the Ag-Au/ PGV bentonite nanocomposite exhibited a pair of peak potential redox couples at 0.19 V/−0.20 V and 1.37 V/0.42 V vs. Ag/AgCl that are due to Ag/Ag + and Au/Au 3+ , respectively. e oxidation peak at 0.19 V and the reduction peak at −0.20 V vs. Ag/AgCl have been reported previously with similar behaviour [8,9,24], and the redox couple of Au at potentials 1.37 V/0.42 V vs. Ag/AgCl is in close agreement with literature studies [3,21]. No response was observed in both CV and DPV of GCE in 0.01 M HCl electrolyte solution.…”

Section: Cyclic Voltammetry and Differential Pulse Voltammetry Behavi...supporting

confidence: 91%

“…e oxidation/reduction peak potentials that were observed in this study for Ag and Au species within the bimetallic system were in accordance with those observed for Ag-Au alloys, which were reported in a study of aptasensing of bacterial cells [5,24]. Based on the CV and DPV voltammograms depicted in Figures 3(a) and 3(d), the Au metal appeared less reactive than Ag due to its lower oxidation peak intensity and potential, which agreed with the findings reported in the p-nitro reduction using Ag-Au alloy NP study [4,17].…”

Section: Cyclic Voltammetry and Differential Pulse Voltammetry Behavi...supporting

confidence: 91%

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Bentonite Nanoclay Optoelectrochemical Property Improvement through Bimetallic Silver and Gold Nanoparticles

Ngcobo

Silwana

Maqhashu

et al. 2022

Journal of Nanotechnology

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This study assesses the physical and electrochemical changes of bimetallic Ag-Au nanoparticle-functionalized bentonite nanoclay. Nanoclay was studied to deduce a better sensing material/film. A chemical co-reduction method was used to synthesize bimetallic Ag-Au c nanoparticles, which were used to prepare a Ag-Au/PGV bentonite composite. Bimetallic Ag-AuNPs and their nanoclay composite were optically characterized using the scanning electron microscope, ultraviolet visible spectroscopy, X-ray diffraction, and Fourier transform infrared, whilst cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to ascertain their electrochemical activity and properties. The results of surface morphological inspection showed an average size of 10 nm, in agreement with XRD. The bimetallic Ag-AuNPs UV/Vis characteristic wavelengths of 414 nm and 516 nm confirmed the presence of Ag and Au metals, respectively. XRD exhibited diffraction planes related to 2θ values of Ag and Au metals, whilst FTIR indicated mainly COO- functional groups from the citrate capping of bimetallic Ag-Au NPs. CV and DPV showed that bentonite nanoclay is largely insulated by silicates but exhibited a small electroactivity of Fe. The electroactivity of Ag-Au/PGV bentonite exhibited peak potentials due to Ag/Ag+ and Au/Au3+ redox couples at 0.19 V/−0.20 V and 1.37 V/0.42, respectively. The Ag-Au/PGV bentonite nanocomposite exhibited the highest surface concentration of 3.25 × 10−2 cm2, a diffusion coefficient of 2.36 × −11 cm2/s, and an electron transfer rate constant (Ks) of 1.99 × 10−4 cm2. The outcome of these results indicated that the Ag-Au/PGV bentonite nanocomposite was more electroactive than PGV. Therefore, this study accentuates Ag-Au/PGV bentonite nanocomposite as a novel and promising platform for electrochemical sensing with higher sensitivity and efficiency than other sensing materials.

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Section: Cyclic Voltammetry and Differential Pulse Voltammetry Behavi...supporting

confidence: 91%

Section: Cyclic Voltammetry and Differential Pulse Voltammetry Behavi...supporting

confidence: 91%

Bentonite Nanoclay Optoelectrochemical Property Improvement through Bimetallic Silver and Gold Nanoparticles

Ngcobo

Silwana

Maqhashu

et al. 2022

Journal of Nanotechnology

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“…Metal NPs can also act as catalysts, promoting electrochemical reactions. Recently, there have been some reports on the evaluation of the application of nanoparticles to electrochemical biosensors [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Rapid and selective electrochemical detection of pb2+ ions using aptamer-conjugated alloy nanoparticles

et al. 2020

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Heavy metals are an important class of technogenic toxicants that pollute rivers and underground water. Here we proposed the use of electrochemical methods using silver (Ag)-gold (Au) alloy nanoparticle (NP)-aptamer-modified glassy carbon electrode (GCE) for the detection of lead ions (Pb 2+). Alloy Ag-Au NPs were electrodeposited on the electrode using the potentiostatic double-pulse method. The NPs were characterized by high-resolution transmission electron microscopy, which revealed that the average NP size was 44 nm. The binding of Pb 2+ induced conformational changes of the aptamer and corresponding modulation of electrochemical signals. As a result, we were able to detect Pb 2+ with a straight slope of 0.01-10 µg/L with limits of detection (LOD) of 0.03 × 10 −2 μg/L for CV, DPV and 0.04 × 10-2 μg/L for EIS. The minimum detectable Pb 2+ concentration was calculated to be 0.8 μM.

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One-pot synthesis of Ag-Cr bimetallic nanoparticles from Catharanthus roseus for anti-bacterial, anticancer, anti-diabetic, and anti-inflammatory activity and toxicity study in zebrafish

Abirami,

Sampath,

Al-Ansari

et al. 2023

Biomass Conv. Bioref.

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A one-pot synthesis of colloidal Ag–Au nanoparticles with controlled composition

Cited by 5 publications

References 28 publications

Bentonite Nanoclay Optoelectrochemical Property Improvement through Bimetallic Silver and Gold Nanoparticles

Bentonite Nanoclay Optoelectrochemical Property Improvement through Bimetallic Silver and Gold Nanoparticles

Rapid and selective electrochemical detection of pb2+ ions using aptamer-conjugated alloy nanoparticles

One-pot synthesis of Ag-Cr bimetallic nanoparticles from Catharanthus roseus for anti-bacterial, anticancer, anti-diabetic, and anti-inflammatory activity and toxicity study in zebrafish

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