XIAO Chuan-hao,ZHOU Bo-ran,CHEN Zheng-bo.Colorimetric Determination of Silver Ions(I) Based on In-situ Formation of Core/Shell Au@Ag Nanoparticles[J].Journal of Instrumental Analysis,2025,44(03):534-539.
XIAO Chuan-hao,ZHOU Bo-ran,CHEN Zheng-bo.Colorimetric Determination of Silver Ions(I) Based on In-situ Formation of Core/Shell Au@Ag Nanoparticles[J].Journal of Instrumental Analysis,2025,44(03):534-539. DOI: 10.12452/j.fxcsxb.240608114.
Colorimetric Determination of Silver Ions(I) Based on In-situ Formation of Core/Shell Au@Ag Nanoparticles
Due to the serious threat of heavy metal ions to human health,there is an urgent need for rapid and sensitive detection of heavy metal ions in the global natural water environment. This article develops a gold nanoparticle(AuNPs)-based label-free colorimetric sensor for simple,sensitive,and selective determination of silver ions(Ag
+
). The sensing mechanism is attributed to ascorbic acid(AA) around AuNPs,which can produce strong interactions between AA and Ag
+
and generate Au@AgNPs at pH 6.2,resulting in simultaneous increasement and blue shift of the surface plasmon resonance(SPR) band of AuNPs at 518 nm,while new peaks appear near 386 nm,accompanied by red-to-yellow color change. On this basis,the colorimetric sensor showed a good linear relationship between the absorbance change at 386 nm wavelength and the Ag
+
concentration in the range of 0.4-1.4 μmol/L,with a detection limit as low as 0.115 μmol/L. In addition,the colorimetric sensor has good selectivity for Ag
+
in presence of other interfering metal ions and can be successfully applied to the determination of Ag
+
in wastewater.
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