Article

Determination of silver ion with cadmium sulfide quantum dots modified by bismuthiol II as fluorescence probe.

College of Chemistry & Chemical Engineering, Lanzhou University, Lanzhou 730000, P.R. China.
Annali di Chimica (impact factor: 0.99). 97(1-2):109-21. pp.109-21
Source: PubMed

ABSTRACT CdS quantum dots (QDs) modified with bismuthiol II potassium salt is prepared in one step. Based on the characteristic fluorescence enhancement of CdS QDs at 480 nm by silver ions, simultaneously, a red shift of fluorescence emission bands of CdS QDs from 460 to 480 nm is observed. A simple, rapid, sensitive and specific detection method for silver ion is proposed. Under optimum conditions, the fluorescence intensity of CdS QDs was linearly proportional to silver ion concentration from 0.01 to 5.0 micromol L(-1) with a detection limit of 1.6 nmol L(-1). In comparison with single organic fluorophores, functionalized CdS quantum dots are brighter, more stable against photobleaching and do not suffer from blinking. Furthermore, the proposed method shows higher sensitivity and selectivity. A possible fluorescence enhancement mechanism is also studied.

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Keywords

bismuthiol II potassium salt
 
CdS QDs
 
CdS quantum dots
 
detection limit
 
fluorescence emission bands
 
fluorescence intensity
 
functionalized CdS quantum dots
 
higher sensitivity
 
photobleaching
 
rapid
 
red shift
 
silver ion
 
silver ion concentration
 
silver ions
 
single organic fluorophores
 
specific detection method
 

Shoujun Lai