Fluorescent Au@Ag core-shell nanoparticles with controlled shell thickness and Hg(II) sensing.
Langmuir
; 27(21): 13198-205, 2011 Nov 01.
Article
em En
| MEDLINE
| ID: mdl-21913719
ABSTRACT
Au-Ag core-shell nanoparticles have been synthesized using synthetic fluorescent dipeptide ß-Ala-Trp (ß-Ala is ß-alanine; Trp is l-tryptophan) in water at pH 6.94 and at room temperature. The synthesis of the Au-Ag core-shell nanomaterial does not involve any external reducing and stabilizing agents, and the constituents of dipeptide ß-alanine and l-tryptophan are naturally occurring. Therefore, the synthesis procedure is ecofriendly. Moreover, the shell thickness has also been controlled, and the optical property of the core-shell nanomaterial varies with the shell thickness. The core-shell nanomaterial exhibits a fascinating fluorescence property. This fluorescent Au@Ag core-shell nanoparticle can detect toxic Hg(II) ions ultrasensitively (with a lower limit of detection of 9 nM) even in presence of Zn(II), Cd(II), and other bivalent metal ions (Ca(II), Mg(II), Ni(II), Mn(II), Ba(II), Sr(II), Pb(II), and Fe(II)). Au-Ag core-shell nanomaterials can also be reused for sensing Hg(II) ions.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Prata
/
Técnicas de Química Analítica
/
Nanotecnologia
/
Nanopartículas Metálicas
/
Corantes Fluorescentes
/
Ouro
/
Mercúrio
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article