Characterisation of biosynthesised silver nanoparticles by scanning electrochemical microscopy (SECM) and voltammetry

Battistel, Dario; Baldi, Franco; Gallo, Michele; Faleri, Claudia; Daniele, Salvatore

doi:10.1016/j.talanta.2014.09.023

Cited by 23 publications

(26 citation statements)

References 43 publications

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“…The redox state and the distribution of the AgNPse mbedded in the Nafion membranes weree stablished by performing SECM measurements in feedback mode. [27] Twor edox mediators, [Ir(Cl) 6 ] 3À and Ru(NH 3 ) 6 3 + ,w ere employed and the measurements were performed by immersiont he substrates in aqueous solutions containing 0.1 m KNO 3 as supporting electrolyte.T he SECM tip was biased at 0.95 Vand À0.35 Vv s. Ag/ AgCl for[ Ir(Cl) 6 ] 3À and Ru(NH 3 ) 6 3 + ,r espectively,w here the processes of the redox mediators occurreda tar ate governed by diffusion( Figure S2).…”

Section: Sample Investigation By Secmmentioning

confidence: 99%

“…Several factors such as composition of the dispersion medium, pH and oxidation state of Ag in the AgNPs have been shown to alter the properties and dissolution rates of silver particles . Therefore, investigation on the redox properties of silver particles and their reactivity at interfaces with liquid phases is highly desirable …”

Section: Introductionmentioning

confidence: 99%

“…These phenomena occur at the solid/solution interface and can be affected by the nature of the support matrix, the AgNPs location within the matrix, as well as the nature of the liquid medium with which the substrate comes into contact. Thus, investigation on these aspects requires the use of techniques that possess sensitivity and spatial resolution …”

Section: Introductionmentioning

confidence: 99%

“…When coupled with voltammetric techniques, such as anodic stripping voltammetry (ASV), SECM also allows achieving high sensitivity for the detection of soluble species at interfaces at sub‐micromolar levels …”

Section: Introductionmentioning

confidence: 99%

“…Information on the oxidation state of Ag in the AgNPsa nd their distribution and aggregation on the surface of the Nafionm embranes wereo btained by SECM measurements. The use of [Ir(Cl) 6 ] 3À and Ru(NH 3 ) 6 3 + as redox mediators allowed establishing whether the AgNPsw ere interconnected to create nanochain networks to provide AgNPsloaded Nafion membranesw ith electronic conductivity. Moreover,c ombination of SECM anda nodic stripping voltammetry allowed establishing the reactivity of the AgNP-Nafion composites in terms of Ag I speciesr eleased at the nanocomposite/solution interface.…”

Section: Introductionmentioning

confidence: 99%

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Scanning Electrochemical Microscopy and Voltammetric Investigation of Silver Nanoparticles Embedded within a Nafion Membrane

2016

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In this paper, silver nanoparticles (AgNPs), incorporated in the poly(perfluorosulfonic) acid membrane Nafion® 117, were fabricated by chemical reduction of the Ag+-loaded membranes, using HCOH in a basic medium as reducing agent. The AgNPs content within the membrane varied in proportion of the concentration of AgNO3 used in the incorporation step of Ag+ in the ion-exchange. Information on size and density of the AgNPs within the matrix was obtained by SEM analysis. The size of the AgNPs varied between 10 and 20 nm, regardless of the AgNO3 concentration used for their preparation, while AgNPs density was the higher, the greater was the AgNO3 concentration in the solution. Information on the oxidation state of Ag in the AgNPs and their distribution and aggregation on the surface of the Nafion membranes were obtained by SECM measurements. The use of [Ir(Cl)6]3- and Ru(NH3)63+ as redox mediators allowed establishing whether the AgNPs were interconnected to create nano-chain networks to provide AgNPs-loaded Nafion membranes with electronic conductivity. Moreover, combination of SECM and anodic stripping voltammetry allowed establishing the reactivity of the AgNPs-Nafion composites in terms of Ag(I) species released at the nanocomposite/solution interface. These aspects are relevant for the potential application of these AgNPs-loaded membranes for antimicrobial protection purposes

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Section: Sample Investigation By Secmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scanning Electrochemical Microscopy and Voltammetric Investigation of Silver Nanoparticles Embedded within a Nafion Membrane

2016

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Scanning electrochemical microscopy and its potential for studying biofilms and antimicrobial coatings

Caniglia

Kranz

2020

Anal Bioanal Chem

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Biofilms are known to be well-organized microbial communities embedded in an extracellular polymeric matrix, which supplies bacterial protection against external stressors. Biofilms are widespread and diverse, and despite the considerable large number of publications and efforts reported regarding composition, structure and cell-to-cell communication within biofilms in the last decades, the mechanisms of biofilm formation, the interaction and communication between bacteria are still not fully understood. This knowledge is required to understand why biofilms form and how we can combat them or how we can take advantage of these sessile communities, e.g. in biofuel cells. Therefore, in situ and real-time monitoring of nutrients, metabolites and quorum sensing molecules is of high importance, which may help to fill that knowledge gap. This review focuses on the potential of scanning electrochemical microscopy (SECM) as a versatile method for in situ studies providing temporal and lateral resolution in order to elucidate cell-to-cell communication, microbial metabolism and antimicrobial impact, e.g. of antimicrobial coatings through the study of electrochemical active molecules. Given the complexity and diversity of biofilms, challenges and limitations will be also discussed.

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Biogenic iron-silver nanoparticles inhibit bacterial biofilm formation due to Ag+ release as determined by a novel phycoerythrin-based assay

Cusimano

Ardizzone

Nasillo

et al. 2020

Appl Microbiol Biotechnol

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Characterisation of biosynthesised silver nanoparticles by scanning electrochemical microscopy (SECM) and voltammetry

Cited by 23 publications

References 43 publications

Scanning Electrochemical Microscopy and Voltammetric Investigation of Silver Nanoparticles Embedded within a Nafion Membrane

Scanning Electrochemical Microscopy and Voltammetric Investigation of Silver Nanoparticles Embedded within a Nafion Membrane

Scanning electrochemical microscopy and its potential for studying biofilms and antimicrobial coatings

Biogenic iron-silver nanoparticles inhibit bacterial biofilm formation due to Ag+ release as determined by a novel phycoerythrin-based assay

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