What question did this study set out to answer?

Examine how particle size, surface modification, and stored charge govern the electronic, optical, and electrochemical properties of subnanometer and nanometer metal clusters in aqueous solution.

May 1, 1993The Journal of Physical Chemistry

Physicochemical properties of small metal particles in solution: "microelectrode" reactions, chemisorption, composite metal particles, and the atom-to-metal transition

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Examine how particle size, surface modification, and stored charge govern the electronic, optical, and electrochemical properties of subnanometer and nanometer metal clusters in aqueous solution.
Generated controlled concentrations of metal atoms using pulse radiolysis to track coalescence kinetics and optical absorption spectra over time.
Manipulated particle surface chemistry and stored charge through nucleophilic chemisorption, secondary metal deposition, and polyanion stabilization.
Bulk metallic absorption spectra emerged after minimal coalescence steps at agglomeration numbers of approximately 10 atoms.
Identified two stable nonmetallic silver intermediate clusters with lifespans of 100 seconds and 15 minutes, absorption bands below the 380 nm plasmon band, and electron photoemission quantum yields exceeding 0.1.
Observed size-dependent redox potentials driving electrochemical water reduction and the controlled synthesis of concentric bimetallic and trimetallic composite particles.

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Implication

Mechanistic investigation reveals size-dependent electronic and redox transitions in colloidal metal clusters, highlighting fundamental pathways of the atom-to-metal transition.

Cite This Study

A. Henglein (1993) studied this question.

synapsesocial.com/papers/69d9636ef20ef26330684cf1 https://doi.org/10.1021/j100123a004

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Implication

Mechanistic investigation reveals size-dependent electronic and redox transitions in colloidal metal clusters, highlighting fundamental pathways of the atom-to-metal transition.

Physicochemical properties of small metal particles in solution: "microelectrode" reactions, chemisorption, composite metal particles, and the atom-to-metal transition

Key Points

Discussion

Implication

Cite This Study

Physicochemical properties of small metal particles in solution: "microelectrode" reactions, chemisorption, composite metal particles, and the atom-to-metal transition

Key Points

Discussion

Implication

Cite This Study

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