Change search
ReferencesLink to record
Permanent link

Direct link
Heavy-metal ion sensors using chitosan-capped gold nanoparticles
School of Advanced Technologies, Asian Institute of Technology, Thailand.ORCID iD: 0000-0002-0074-3504
2005 (English)In: Science and Technology of Advanced Materials, ISSN 1468-6996, E-ISSN 1878-5514, Vol. 6, no 3-4 SPEC. ISS., 335-340 p.Article in journal (Refereed) Published
Abstract [en]

We report a novel strategy for using gold nanoparticles capped with chitosan for sensing ions of heavy metals. Acidic anions (glutamate ions in our case) are expected to cap the nanoparticle surfaces similar to conventional methods of stabilization of gold nanoparticles by citrate ions. The polycationic nature of chitosan enables attachment of the polymer to the negatively charged gold nanoparticle surfaces through electrostatic interactions. Use of chitosan serves dual purpose of providing sufficient steric hindrance ensuring stability of the colloid and also to functionalize the nanoparticles for use as sensors. The well-documented chelating properties of chitosan and the sensitivity of the optical properties of gold nanoparticles to agglomeration have been employed to detect low concentrations of heavy metals ions (Zn2+ and Cu2+) in water. A comparison of the optical absorption spectra of the colloidal suspension before and after exposure to metal ions is a good indicator of the concentration of the heavy metal ions.

Place, publisher, year, edition, pages
Elsevier, 2005. Vol. 6, no 3-4 SPEC. ISS., 335-340 p.
National Category
Nano Technology
URN: urn:nbn:se:kth:diva-175271DOI: 10.1016/j.stam.2005.03.007ISI: 000231970600023ScopusID: 2-s2.0-23944482368OAI: diva2:918321

QC 20160412

Available from: 2016-04-11 Created: 2015-10-10 Last updated: 2016-04-12Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Dutta, Joydeep
In the same journal
Science and Technology of Advanced Materials
Nano Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 7 hits
ReferencesLink to record
Permanent link

Direct link