Tunable electrochemistry of gold-silver alloy nanoshells

Russo, Lorenzo; Puntes, Víctor; Merkoçi, Arben

doi:10.1007/s12274-018-2157-y

Cited by 10 publications

(19 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ag-NPs were selected over Pt-NPs and Au-NPs, because they represent a less expensive alternative nanoelectrocatalyst, with tunable morphology and further feasible functionalization by simple approaches. All of this makes the electrochemical behavior of Ag-NPs easily customizable [24]. Specifically, three procedures of Ag-NP deposition are considered: drop-casting (DC), in situ (IS), and spin-coating (SC).…”

Section: Introductionmentioning

confidence: 99%

Strategies for Surface Modification with Ag-Shaped Nanoparticles: Electrocatalytic Enhancement of Screen-Printed Electrodes for the Detection of Heavy Metals

Torres-Rivero

Torralba-Cadena

Espriu-Gascon

et al. 2019

Sensors

View full text Add to dashboard Cite

Screen-printed carbon nanofiber electrodes (SPCNFEs) represent an alternative with great acceptance due to their results, as well as their low impact on the environment. In order to improve their performance, in the present work they were modified with silver nanoparticles (Ag-NPs) and electrochemically characterized by using anodic stripping voltammetry. From the Ag-NP synthesis, silver seeds (Ag-NS) and silver nanoprisms (Ag-NPr) were obtained. The Ag-NP formation was confirmed by micrographs, where Ag-NPs with diameters of 12.20 ± 0.04 nm for Ag-NS and 20.40 ± 0.09 nm for Ag-NPr were observed. The electrodes were modified by using three different deposition methods—drop-casting, spin-coating, and in situ approaches—that offer different nanoparticle distribution and electrode modification times. It was observed that the last methodology showed a low amount of Ag-NS deposited on the electrode surface and deep alteration of this surface. Those facts suggest that the in situ synthesis methodology was not appropriate for the determination of heavy metals, and it was discarded. The incorporation of the nanoparticles by spin-coating and drop-casting strategies showed different spatial distribution on the electrode surface, as proved by scanning electron microscopy. The electrodes modified by these strategies were evaluated for the cadmium(II) and lead(II) detection using differential pulse anodic stripping voltammetry, obtaining detection limit values of 2.1 and 2.8 µg·L−1, respectively. The overall results showed that the incorporation route does not directly change the electrocatalytic effect of the nanoparticles, but the shape of these nanoparticles (spherical for seeds and triangular for prisms) has preferential electrocatalytic enhancement over Cd(II) or Pb(II).

show abstract

Section: Introductionmentioning

confidence: 99%

Strategies for Surface Modification with Ag-Shaped Nanoparticles: Electrocatalytic Enhancement of Screen-Printed Electrodes for the Detection of Heavy Metals

Torres-Rivero

Torralba-Cadena

Espriu-Gascon

et al. 2019

Sensors

View full text Add to dashboard Cite

show abstract

“…AuAg alloy nanoparticles present the best of both worlds in relation to AuNPs and AgNPs since they provide not only the possibility of an easy and sensitive detection by the silver oxidation signals but also present better stability than typical single-component AgNPs. These alloyed nanoparticles can be characterized and detected by a direct electrochemical method as demonstrated using polyester SPEs [67]. The detection method is performed in a chloride-containing solution (PBS, pH 7.4), which is able to make controlled corrosion (Cl − and O 2 are essential) of the silver component (Figure 4), and detection is carried out by deposition-stripping steps.…”

Section: Strategies For Electrochemical Detection Of Nanoparticlesmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Electrochemical Detection and Characterization of Nanoparticles with Printed Devices

Martín‐Yerga

2019

Biosensors

View full text Add to dashboard Cite

Innovative methods to achieve the user-friendly, quick, and highly sensitive detection of nanomaterials are urgently needed. Nanomaterials have increased importance in commercial products, and there are concerns about the potential risk that they entail for the environment. In addition, detection of nanomaterials can be a highly valuable tool in many applications, such as biosensing. Electrochemical methods using disposable, low-cost, printed electrodes provide excellent analytical performance for the detection of a wide set of nanomaterials. In this review, the foundations and latest advances of several electrochemical strategies for the detection of nanoparticles using cost-effective printed devices are introduced. These strategies will equip the experimentalist with an extensive toolbox for the detection of nanoparticles of different chemical nature and possible applications ranging from quality control to environmental analysis and biosensing.

show abstract

“…Meanwhile, the electrodeposited particles are mobile over the surface of applied substrates, leading to the aggregation and coalescence to larger particles . In contrast to OPD, another electrodeposition method called underpotential deposition (UPD), with epitaxial growth characteristics, is generally employed to fabricate foreign metal monolayer or sub‐monolayer on noble metal . However, UPD also follows Volmer‐Weber growth mechanism on homogeneous substrate, generating large 2D islands .…”

Section: Introductionmentioning

confidence: 99%

“…[21,25] In contrast to OPD, another electrodeposition method called underpotential deposition (UPD), with epitaxial growth characteristics, is generally employed to fabricate foreign metal monolayer or sub-monolayer on noble metal. [26][27][28][29] However, UPD also follows Volmer-Weber growth mechanism on homogeneous substrate, generating large 2D islands. [30] In addition, UPD of metal substances on pure carbon is not feasible because of the weak metal-support interaction.…”

Section: Introductionmentioning

confidence: 99%

Underpotential Deposition of Copper Clusters on Sulfur and Nitrogen Co‐Doped Graphite Foam for the Oxygen Reduction Reaction

Zeng

et al. 2019

ChemElectroChem

View full text Add to dashboard Cite

In this study, we successfully fabricated approximately 1 nm copper clusters on sulfur and nitrogen co‐doped graphite foam (SNGF) by using an electrodeposition method. The introduction of sulfur dopants enhances the metal‐support interaction and, thus, allows the application of the underpotential deposition (UPD) technique on graphite foam. Furthermore, the strong S−Cu binding leads to the preferential formation and firm anchoring of Cu nuclei on monodispersed S sites. The controllable growth of Cu nuclei into Cu clusters is achieved by controlling the deposition amount by adjusting the electrochemical parameters. As an example, the supported Cu clusters were utilized towards oxygen reduction reaction catalysis, exhibiting a high catalytic activity and a long‐term durability. Remarkably, this strategy is promising for developing a general method to prepare other metal clusters (e. g. Ag clusters).

show abstract

Tunable electrochemistry of gold-silver alloy nanoshells

Cited by 10 publications

References 44 publications

Strategies for Surface Modification with Ag-Shaped Nanoparticles: Electrocatalytic Enhancement of Screen-Printed Electrodes for the Detection of Heavy Metals

Strategies for Surface Modification with Ag-Shaped Nanoparticles: Electrocatalytic Enhancement of Screen-Printed Electrodes for the Detection of Heavy Metals

Electrochemical Detection and Characterization of Nanoparticles with Printed Devices

Underpotential Deposition of Copper Clusters on Sulfur and Nitrogen Co‐Doped Graphite Foam for the Oxygen Reduction Reaction

Contact Info

Product

Resources

About