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Nanoparticle-Mediated Intervalence Charge Transfer: Core-Size Effects.

Peiguang Hu¹, Limei Chen¹, Christopher P Deming¹

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|December 9, 2015

Summary

This summary is machine-generated.

Platinum nanoparticles functionalized with ethynylferrocene exhibit size-dependent electronic properties. Smaller nanoparticles show semiconductor behavior, while larger ones are metal-like, with UV light enhancing conductivity in the former.

Keywords:

band gaps ferrocene intervalence charge transfer photoirradiation platinum nanoparticles

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Published on: January 19, 2018

Area of Science:

Nanotechnology
Materials Science
Electrochemistry

Background:

Platinum nanoparticles (NPs) are crucial in catalysis and electronics.
Functionalization of NPs with organic molecules can tune their properties.
Ferrocene derivatives offer redox activity and can influence electronic behavior.

Purpose of the Study:

To synthesize and characterize two types of platinum nanoparticles (NPs) functionalized with ethynylferrocene.
To investigate the influence of NP size on their electronic and optical properties.
To explore the effect of UV photoirradiation on the functionalized NPs.

Main Methods:

Preparation of subnanometer (Pt10eFc) and larger (Pt314eFc) platinum nanoparticles.
Infrared (IR) spectroscopy to analyze vibrational energies and charge delocalization.
Electrochemical measurements (voltammetry) to study charge transfer.
UV photoirradiation experiments.

Main Results:

Pt10eFc NPs exhibited semiconductor characteristics with a 1.0 eV bandgap; Pt314eFc NPs were metal-like with no significant bandgap.
IR spectroscopy revealed red-shifted vibrational energies with increasing NP size, indicating enhanced intraparticle charge delocalization.
Electrochemical studies showed intervalence charge transfer between ferrocenyl groups, weaker in Pt10eFc than Pt314eFc.
UV photoirradiation enhanced the electronic conductivity of Pt10eFc NPs but had no significant effect on Pt314eFc NPs.

Conclusions:

The size of platinum nanoparticles significantly impacts their electronic structure and charge transport properties.
Ethynylferrocene functionalization enables tuning of NP conductivity and photoresponsive behavior.
Subnanometer platinum nanoparticles show promise for applications requiring photo-tunable electronic conductivity.