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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...

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Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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Published on: March 2, 2016

Electrochemical solid-state phase transformations of silver nanoparticles.

Poonam Singh1, Kate L Parent, Daniel A Buttry

  • 1Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States.

Journal of the American Chemical Society
|March 6, 2012
PubMed
Summary
This summary is machine-generated.

Researchers synthesized adenosine triphosphate (ATP)-capped silver nanoparticles (ATP-Ag NPs) for electrochemical applications. These NPs undergo reversible redox-driven phase transformations, enabling controlled silver halide or silver oxide formation.

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Area of Science:

  • Nanotechnology
  • Electrochemistry
  • Materials Science

Background:

  • Silver nanoparticles (Ag NPs) are widely studied for their unique optical and electronic properties.
  • Controlling the surface chemistry and electrochemical behavior of nanoparticles is crucial for advanced applications.
  • Adenosine triphosphate (ATP) can serve as a capping ligand to stabilize nanoparticles and influence their assembly.

Purpose of the Study:

  • To synthesize and characterize adenosine triphosphate (ATP)-capped silver nanoparticles (ATP-Ag NPs).
  • To investigate the electrochemical behavior and phase transformations of ATP-Ag NPs within layer-by-layer (LbL) films.
  • To explore the potential of these functionalized nanoparticles in electrochemical systems.

Main Methods:

  • Synthesis of Ag NPs using AgNO(3) reduction with ATP as a capping agent.
  • Characterization via transmission electron microscopy (TEM), UV-vis spectroscopy, X-ray diffraction, and energy-dispersive X-ray analysis.
  • Electrochemical studies using cyclic voltammetry on LbL films of ATP-Ag NPs on modified electrodes.

Main Results:

  • Successfully synthesized ATP-Ag NPs with controlled size (4.5 ± 1.1 nm) and ATP capping.
  • Demonstrated incorporation of negatively charged ATP-Ag NPs into LbL films with poly(diallyldimethylammonium) chloride.
  • Observed chemically reversible redox-driven solid-state phase transformations of Ag NPs to silver halide or Ag(2)O NPs.

Conclusions:

  • ATP-capped silver nanoparticles can be effectively integrated into LbL films for electrochemical applications.
  • The nanoparticles exhibit complete, one-electron redox processes per silver atom during phase transformations.
  • This study highlights a novel method for controlling nanoparticle transformations via electrochemistry.