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Synthesis of Cd-free InP/ZnS Quantum Dots Suitable for Biomedical Applications

Synthesis of Cd-free InP/ZnS Quantum Dots Suitable for Biomedical Applications

Published on: February 6, 2016

Arylthiolate-protected silver quantum dots.

Matthew R Branham¹, Alicia D Douglas, Allan J Mills

¹Kenan Laboratories of Chemistry, University of North Carolina, Chapel Hill, NC 27599-3290, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|December 13, 2006

Summary

This summary is machine-generated.

Researchers developed a novel silver cluster (AgBBT MPC) that shows quantized double layer charging voltammetry in solution. Synthesis method significantly impacts electrochemical and optical properties, with a two-phase approach yielding superior results.

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Area of Science:

Nanomaterials Science
Electrochemistry
Surface Chemistry

Background:

Silver clusters (Ag MPCs) are of interest for their unique electronic and optical properties.
Achieving stable, soluble silver nanoparticles with controlled electrochemistry remains a challenge.
Quantized double layer charging (QDL) voltammetry is a sensitive technique for probing nanoparticle behavior.

Purpose of the Study:

To synthesize and characterize a new organic-soluble silver cluster protected by 4-tert-butylbenzyl mercaptan (AgBBT MPC).
To investigate the influence of synthesis protocols on the electrochemical and optical properties of AgBBT MPCs.
To demonstrate QDL voltammetry in dissolved silver nanoparticles.

Main Methods:

Synthesis of AgBBT MPCs using two distinct protocols (two-phase and single-phase).
Characterization using UV-Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetry, mass spectrometry, and transmission electron microscopy (TEM).
Electrochemical analysis including cyclic voltammetry to observe QDL phenomena.

Main Results:

The two-phase synthesis (Prep A) yielded AgBBT MPCs with a 475 nm surface plasmon absorbance and QDL voltammetry.
The single-phase synthesis (Prep B) resulted in AgBBT MPCs lacking these properties, attributed to poor passivation and oxide formation (supported by XPS).
Stoichiometric formula suggested as Ag140BBT53, with TEM revealing polydispersity and aggregates. Both preparations showed low electron hopping conductivity in films.

Conclusions:

A novel, organic-soluble AgBBT MPC exhibiting QDL voltammetry has been successfully synthesized.
Synthesis methodology critically dictates the electrochemical and optical performance of silver clusters.
This work presents the first example of dissolved silver nanoparticles demonstrating QDL voltammetry, opening avenues for nanoparticle electrochemistry studies.