fulltext.study @t Gmail

Preparation and optical properties of Ag/PPy composite colloids

Paper ID Volume ID Publish Year Pages File Format Full-Text
28220 44066 2007 6 PDF Available
Title
Preparation and optical properties of Ag/PPy composite colloids
Abstract

Ag/PPy (polypyrrole) composite colloids were prepared through the reaction of silver nitrate with pyrrole solution in DMF either in the dark, or under the irradiation of femtosecond laser (fs) pulse or UV lamp. The UV–vis spectra of the nanocomposite colloid display an intense absorption band around 620 nm, accompanied by a weak one around 470 nm. The colors and optical absorption spectra of as-synthesized colloids can be reversibly tuned between blue and red, corresponding to absorption band of 620 nm and 526 nm, within few seconds by adding base and acid solutions or gases in turn into the composite colloid suspension. In addition, excess of H+ solution enhanced the absorption band around 470 nm and, at the same time, depressed that around 620 nm. The possible mechanism for the formation and optical absorption properties of the Ag/PPy composite colloid was proposed.

Keywords
Ag/PPy composite colloid; Optical properties; Color; pH Effect
First Page Preview
Preparation and optical properties of Ag/PPy composite colloids
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 187, Issues 2–3, 15 April 2007, Pages 146–151
Authors
, , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering