Free Content Reversible Aggregation Control of Polyvinylpyrrolidone Capped Gold Nanoparticles as a Function of pH

 Download
(PDF 5,976.2kb)
 
Download Article:

Abstract:

A simple procedure has been developed for aggregation of polyvinylpyrrolidone (PVP) capped gold nanoparticles by controlling the pH of the solution. PVP-capped gold nanoparticles were synthesized via wet chemical method. Transmission electron microscopy (TEM) and UV-vis spectroscopy techniques were employed for determining the morphological features and surface plasmon resonance (SPR) of the gold nanoparticles. When the pH of the solution containing PVP-capped gold nanoparticles was changed from 6.7 to 1.0, the color of the solution changed from deep red to blue due to SPR weakening by particle aggregate formation. The color of the solution returned to its original red when the pH of the solution was brought back to 6.7. Furthermore, citrate protection of the gold nanoparticles was found to inhibit the reverse action. This reversible/irreversible-selectable structural control of gold nanoparticles with drastic changes in their optical absorption characteristics may find various nanophotonic applications including contactless pH detection.

Keywords: GOLD NANOPARTICLES; PH AGGREGATION; PVP

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/mex.2012.1082

Publication date: December 1, 2012

More about this publication?
  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more