Ultrasensitive Cu2+ sensing by near-infrared-emitting CdSeTe alloyed quantum dots.
The near-infrared (NIR)-emitting CdSeTe alloyed quantum dots (AQdots) that capped with L-cysteine were applied for ultrasensitive Cu(2+) sensing. The sensing approach was based on the fluorescence of the AQdots selectively quenched in the presence of Cu(2+). Experimental results showed a low interference response towards other metal ions. The possible quenching mechanism was discussed on the basis of the binding between L-cysteine and the metal ions. In addition, biomolecules have low effect on the fluorescence due to the minimized interferences in NIR region. The response of the NIR optical sensor was linearly proportional to the concentration of Cu(2+) ranging from 2 x 10(-8) to 2 x 10(-6) mol L(-1). Furthermore, it has been successfully applied to the detection of Cu(2+) in vegetable samples.
Key Laboratory of Analytical Chemistry for Life Science (MOE), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
Guo-Xi
GX
Liang
Hong-Ying
HY
Liu
Jian-Rong
JR
Zhang
Jun-Jie
JJ
Zhu
D000497:Alloys / Q000737:chemistry; D002104:Cadmium / Q000737:chemistry; D003300:Copper / Q000032:analysis*; D003545:Cysteine / Q000737:chemistry; D005453:Fluorescence; D045663:Quantum Dots; D012643:Selenium / Q000737:chemistry; D012680:Sensitivity and Specificity; D019265:Spectroscopy, Near-Infrared / Q000379:methods*; D013691:Tellurium / Q000737:chemistry; D014675:Vegetables / Q000737:chemistry
D000497:Alloys; D002104:Cadmium; D003300:Copper; D012643:Selenium; D003545:Cysteine; D013691:Tellurium