Polymeric p–n Nanojunctions: Formation and Electrochemical Properties of C₆₀‐Pd@Polypyrrole Core–Shell Nanoparticles

Abstract

A simple approach to the synthesis of core–shell C60‐Pd@polypyrrole nanoparticles is described. The nanoparticles were characterized by using scanning electron microscopy, transmission electron microscopy, energy‐dispersive X‐ray fluorescence, infrared spectroscopy, Raman spectroscopy, and thermogravimetric analysis. Special attention was devoted to the electrochemical properties of the C60‐Pd@polypyrrole nanoparticles. Thin films formed from these nanoparticles exhibited a large potential range of electrochemical activity. Oxidation of the polypyrrole component was observed at positive potentials. Reduction of the C60‐Pd inner core in a negative potential range depended on the thickness of the outer polypyrrole layer. With a thin outer shell (less than approximately 20 nm), electrons and counter ions can be transported through it, enabling reduction of the inner C60‐Pd phase. Owing to the different redox properties of the two nanoparticle components, these systems represent spherical p–n nanojunctions.

Band Gap Tuning in Composites of Polypyrrole Derivatives and C60Pd3 Polymer as Models for p–n Junction: A First Principle Computational Study

“…In more realistic conditions, C 60 Pd 3 interacts with PPy under much higher loadings . Therefore, we also wanted to clarify how the addition of a second PPy affects the PPy/C 60 Pd 2 (‐2Pd) system.…”

Theoretical investigation of interactions between palladium and fullerene in polymer

“…The electrical properties of the C 60 Pd 3 polymer are particularly important in terms of potential application of this material in charge storage devices [25][26][27][28] and solar energy conversion systems. 29 The C 60 Pd 3 polymer shows low electrical conductivity in its neutral state. Reduction of the polymer results in a signicant increased conductivity 30 and creates mixed valence states along the polymeric chain.…”

Fullerene‐Based Conducting Polymers:n‐Dopable Materials for Charge Storage Application

“…A very broad potential range of electrochemical activity of the bilayer is observed for this material. [217,218] The electrochemical behavior of the amorphous poly-C 60 Pd 3 / polypyrrole composite depends on the thickness of polypyrrole layer. [217,218] The thick polypyrrole layer completely inhibits the Scheme 23.…”

“…[217,218] The electrochemical behavior of the amorphous poly-C 60 Pd 3 / polypyrrole composite depends on the thickness of polypyrrole layer. [217,218] The thick polypyrrole layer completely inhibits the Scheme 23. Reactions forming the multiblock copolymer, P 3 HT-b-PFDP: i) C 60 , 2,2-bipyridine,CuBr, toluene, 24 h, reflux; ii) α,ω-dihydroxybenzylpoly(3-hexylthiophene) K 2 CO 3 , toluene, 18-crown-6, 3 h, 80 °C.…”