期刊论文

Yang, Shengyuan

英文

Microchimica Acta

0026-3672

2019

186

8

1-9

10.1007/s00604-019-3625-0

The authors gratefully acknowledge the support of the National Natural Science Foundation of China (No. 11205085), the Department of Education Excellent Youth Project of Hunan Province in China (No. 15B202), the Natural Science Foundation Project of Hunan Province (No. 2018JJ2323), the Technology Innovation Guidance Program Clinical Medical Technology Innovation Guide Project of Hunan Province (No. 2017SK50218), the Open Project Program of the State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University (Changsha, China; 2012018), the Defense Industrial Technology Development Program (JCKY2016403C001), and the Key Laboratory of Hengyang for Health Hazard Factors Inspection and Quarantine (No. 2018KJ110). The authors gratefully acknowledge the support of the National Natural Science Foundation of China (No. 11205085), the Department of Education Excellent Youth Project of Hunan Province in China (No. 15B202), the Natural Science Foundation Project of Hunan Province (No. 2018JJ2323), the Technology Innovation Guidance Program Clinical Medical Technology Innovation Guide Project of Hunan Province (No. 2017SK50218), the Open Project Program of the State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University (Changsha, China; 2012018), the Defense Industrial Technology Development Program (JCKY2016403C001), and the Key Laboratory of Hengyang for Health Hazard Factors Inspection and Quarantine (No. 2018KJ110).

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A dually responsive fluorescent probe for determination of U(IV) and mercury(II) ions was synthesized. The probe consists of a cytosine-rich hairpin DNA loaded with silver nanoclusters (DNA-AgNCs). The fluorescence of the AgNCs is found to be quenched by UO2(II) at pH 5.0and Hg(II) at pH 7.0due to combinedstatic and dynamic quenching. Under the optimal conditions, the greenfluorescence of the DNA-AgNCs, best measured at excitation/emission wavelengths of 420/525nm, decreases in the 4.0 to 75 pM UO2(II) concentration range, and in the 0.3 to 8.0...