Synthesis of Novel Nanocrystals as Fluorescent Sensors for Hg2+ Ions

Abstract

CdTe nanocrystals as fluorescent sensors for Hg2+ ions were synthesized. These nanocrystals were highly sensitive for Hg2+ ions and the selectivity was found to be Hg2+ > Cu2+ > other representative heavy metal ions. Moreover, they bear the following merits. First, they are easily synthesized; second, they have a narrow, tunable, symmetric emission spectrum.

Radiation synthesized poly(n-vinyl-2-pyrrolidone)-stabilized-gold nanoparticles as LSPR-based optical sensor for mercury ions estimation

“…The methods currently used for the determination of Hg 2? ions include atomic absorption spectrometry (Butler et al 2006), inductively coupled plasma-mass spectrometry (Li et al 2006), selective cold vapor atomic fluorescence spectrometry (Leermakers et al 2005), organic fluorophores/chromophores (Zhu et al 2006;Guo et al 2011;El-Safty et al 2008;Coronado et al 2005), semiconductor nanocrystals (Chen et al 2004;Page et al 2011), cyclic voltammetry (Nolan and Kounaves 1999;Kim et al 1998), etc., based techniques. However, most of these conventional techniques are invariably complicated, time-consuming, expensive as well as inconvenient for point-of-use applications.…”

Sensitive Hg (II) ion detection by fluorescent multilayer films fabricated with quantum dots

“…Their excellent PL properties endow them with considerable applications in biological labeling, cellular effectors and reporters [11]. Simultaneously, many researchers make efforts to use QDs for detection of some metal ions [1,2,8,[12][13][14][15][16][17][18][19][20], small molecules [21][22][23][24][25], and temperature [26]. For metal ions, Cu (II) and Ag (I) are widely investigated.…”

Two distinct photoluminescence responses of CdTe quantum dots to Ag (I)

“…Very recently, Konishi and Hiratani [12] found that the PL intensity of Cd 10 S 16 molecular cluster can be effectively increased by Cu + in water. Besides the above activation effect, some heavy metal ions, such as Cu 2+ and Hg 2+ , effectively quench PL of QDs [13][14][15][16][17][18][19]. Interestingly, most reports demonstrated that Ag + could quench PL of cadmium chalcogenide (CdS, CdSe or CdTe) nanoparticles [14,[20][21][22].…”