Analytical Sciences

Abstract − Analytical Sciences, 33(3), 381 (2017).

Selective and Sensitive Detection of Silver(I) Ion Based on Tetracationic Complex and TGA/GSH Co-capped Quantum Dots as an Effective Fluorescent Sensing Platform
Xue-Wen LIU, Jun-Shi SHU, Yang XIAO, Yang YANG, and Song-Bai ZHANG
College of Chemistry and Chemical Engineering, Hunan University of Arts and Science, ChangDe 415000, P. R. China
CdTe quantum dots capped with glutathione (GSH) and thioglycolic acid (TGA) were synthesized and the interaction between QDs and tetracationic Fe complex was investigated. Based on the specific interaction between Ag+ and cytosine bases (C), we designed a label-free DNA sensor for the detection of Ag+ in aqueous solution. Furthermore, tetracationic Fe complex with a higher positive charge is demonstrated to improve the sensitivity of the sensor. A detection limit of 3.3 nmol dm−3 was obtained, which was lower than in previous reports. This sensor also exhibits promising potential for real sample analysis.