Understanding gold nanoparticle dissolution in cyanide-containing solution <i>via</i> impact-chemistry

Suherman, Alex L.; Zampardi, Giorgia; Kuss, Sabine; Tanner, Eden E. L.; Amin, Hatem M. A.; Young, Neil P.; Compton, Richard G.

doi:10.1039/c8cp05154b

Cited by 22 publications

(14 citation statements)

References 53 publications

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“…The dissolution of the AuNPs further leads to the disappearance of the PVA/CS/AuNP composite's red color. A similar observation was reported in previous works that investigated the reaction of colloidal gold nanoparticles with cyanide [33][34][35][36][37].…”

Section: Colorimetric Detection Of Free Cyanide In Watersupporting

confidence: 87%

“…The application of the PVA/CS/AuNP composite as a colorimetric sensor for cyanide ions in water was investigated. Although the potential of AuNPs for cyanide detection has already been reported in previous literature, most of the investigations are focused on the use of AuNPs in its colloidal or liquid phase [33][34][35][36]. Hence, investigating the potential of immobilized AuNPs in a biodegradable polymer solid substrate such as PVA/CS for similar applications could advance the portability and stability of AuNP-based colorimetric sensors.…”

Section: Colorimetric Detection Of Free Cyanide In Watermentioning

confidence: 99%

“…As mentioned, the change in the color of the PVA/ CS/AuNP composite film might be attributed to the dissolution chemistry of AuNPs in the presence of cyanide, as indicated in Eq. 1 [33]. The gold nanoparticles on the composite reacted with the free cyanide to form a water-soluble Au-CN complex.…”

Section: Colorimetric Detection Of Free Cyanide In Watermentioning

confidence: 99%

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Preparation of Spin-Coated Poly(vinyl alcohol)/ chitosan/ Gold Nanoparticles Composite and Its Potential for Colorimetric Detection of Cyanide in Water

Budlayan¹,

Oracion²,

Rosa³

et al. 2022

Pol. J. Environ. Stud.

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The rampant use of cyanide in mining activities has posed a substantial hazard to aquatic ecosystems and human health. Herein, a composite film of poly(vinyl alcohol)/chitosan (PVA/CS) with gold nanoparticles was synthesized as a potential colorimetric sensor for cyanide ions detection in water. The utilized AuNPs with a mean diameter of 14.32±3.49 nm were synthesized by chemical reduction using polyethyleneimine. Ultraviolet-visible spectroscopy revealed the characteristic peak of AuNPs at around 530 nm in the spectrum of PVA/CS/AuNP film, while SEM microscopy revealed the integration AuNPs across the polymer substrate. A color change from red to colorless was observed on the composite film after the addition of water samples with cyanide ions with a visual detection limit between 0.1-1 ppm. The sensor also exhibited good selectivity towards cyanide against the tested water samples containing

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Section: Colorimetric Detection Of Free Cyanide In Watersupporting

confidence: 87%

Section: Colorimetric Detection Of Free Cyanide In Watermentioning

confidence: 99%

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Preparation of Spin-Coated Poly(vinyl alcohol)/ chitosan/ Gold Nanoparticles Composite and Its Potential for Colorimetric Detection of Cyanide in Water

Budlayan¹,

Oracion²,

Rosa³

et al. 2022

Pol. J. Environ. Stud.

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“…6,20,23 Simulation results predict that Δi due to collision within the actual radius of the UME was 3-6.5 nA, and the magnitude of decrease in the current due to the collision of MCS increased toward the edge. However, in the case of a UME, the "edge effect" 7,23,35 occurs, because the flux of the redox species is higher at the edge than at the center. Moreover, Δi of the collision signal was observed to be below 3 nA several times in the distribution of the experimental collision (Figure 3(b)).…”

Section: Single Microcystis Detection Through Electrochemical Collision Eventsmentioning

confidence: 99%

Single Microcystis Detection Through Electrochemical Collision Events on Ultramicroelectrodes

Lee

Song

et al. 2021

Bulletin Korean Chem Soc

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This study introduces the electrochemical detection of a single microcystis on an Au ultramicroelectrode based on single-entity electrochemistry. The electrochemical collisions occur when the microcystis is adsorbed on the electrode surface. This hinders the oxidation of the electroactive redox species in the solution, thus making the current decrease like a staircase. In this experiment, the current decrease caused by the collision which requires an appropriate concentration of the redox species and initial potential, providing information on migration effect by zeta-potential, and collision frequency. Comparison of the simulation results of the finite element method and the experimental results suggested that the staircase current decrease caused by the microcystis can occur due to collision not only on the electrode surface but also on the surrounding regions of the electrode surface (i.e., the active area). These results suggest various applications of the single-entity cell detection using the electrochemical method for real-time analysis.

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“…The magnitude of the charge, duration, and frequency of a numerically relevant number of single collision events can be analysed statistically in order to harvest information on the reactions occurring at the nanoscale [ 28 – 30 , 32 , 38 , 39 ]. Electrode-particle collision experiments have been employed to analyse the electrochemical behaviour and the reaction kinetics of a variety of systems: from metal deposition [ 27 ] and dissolution [ 40 ], to ion (de-)insertion reactions [ 23 , 41 – 43 ].…”

Section: Introductionmentioning

confidence: 99%

Fast electrodeposition of zinc onto single zinc nanoparticles

Zampardi

Compton

2020

J Solid State Electrochem

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The zinc deposition reaction onto metallic zinc has been investigated at the single particle level through the electrode-particle collision method in neutral solutions, and in respect of its dependence on the applied potential and the ionic strength of a sulphatecontaining solution. Depending on the concentration of sulphate ions in solution, different amounts of metallic zinc were deposited on the single Zn nanoparticles. Specifically, insights into the electron transfer kinetics at the single particles were obtained, indicating an electrically early reactant-like transition state, which is consistent with the rate-determining partial dehydration/de-complexation process. Such information on the reaction kinetics at the nanoscale is of vital importance for the development of more efficient and long-lasting nanostructured Zn-based negative electrodes for Zn-ion battery applications.

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Understanding gold nanoparticle dissolution in cyanide-containing solution via impact-chemistry

Abstract: The electrochemical dissolution of citrate-capped gold nanoparticles (AuNPs) was studied in cyanide (CN−) containing solutions.

Cited by 22 publications

References 53 publications

Preparation of Spin-Coated Poly(vinyl alcohol)/ chitosan/ Gold Nanoparticles Composite and Its Potential for Colorimetric Detection of Cyanide in Water

Preparation of Spin-Coated Poly(vinyl alcohol)/ chitosan/ Gold Nanoparticles Composite and Its Potential for Colorimetric Detection of Cyanide in Water

Single Microcystis Detection Through Electrochemical Collision Events on Ultramicroelectrodes

Fast electrodeposition of zinc onto single zinc nanoparticles

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