Highly selective and sensitive probes for the detection of Cr(vi) in aqueous solutions using diglycolic acid-functionalized Au nanoparticles. Issue 19 (8th April 2019)

• Record Type: Journal Article
• Authors: Zhang, Yang; Bai, Ruixi; Zhao, Zhigang; Liao, Qiuxia; Chen, Peng; Guo, Wanghuan; Cai, Chunqing; Yang, Fan
• Is Part Of: RSC advances. Volume 9:Issue 19(2019)
• Page Start: 10958
• Page End: 10965
• Publication Date: 2019-04-08
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra00010k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : In this study, we proposed a diglycolic acid-functionalized gold nanoparticle (Au NP) probe, which are highly sensitive for the detection of chromium ions based on the application of surface plasmon resonance (SPR) theory. Abstract : In this study, a variety of diglycolic acid-functionalized gold nanoparticle (Au NP) probes are reported, which are highly sensitive for the detection of chromium ions, Cr(vi ) ions, at low concentrations in aqueous solutions based on the application of surface plasmon resonance (SPR) theory. Due to its outstanding affinity for Cr(vi ) ions, the capped diglycolic acid would induce the aggregation of the NP probes upon encountering them; this was evidenced by the obvious red-shifting of the SPR peak and the enlarged size of the NPs. For the same reason, the selectivity of the probe for Cr(vi ) against other heavy metal ions was found to be remarkable. Under optimized conditions, the probe showed the limit of detection (LOD) of 0.32 ppb for Cr(vi ) and a linear detection scale ranging from 0.32 ppb to 0.1 ppm. To the best of our knowledge, this is probably the lowest LOD reported for Cr(vi ) detection among those of the methods based on SPR.