Selective Detection of Trace Cr³⁺ in Aqueous Solution by Using 5,5′-Dithiobis (2-Nitrobenzoic acid)-Modified Gold Nanoparticles

Abstract

A simply prepared gold nanoparticle-based sensor, 5,5'-dithiobis (2-nitrobenzoic acid) (DTNBA)-modified gold nanoparticles, was prepared to explore the sensitive and selective detection of metal ions using a colorimetric technique. The selective detection of trace levels (93.6 ppb) Cr3+ in aqueous solution was achieved over 15 other metal ions. The functionalized gold nanoparticles became aggregated in solution in the presence of Cr3+ by an ion-templated chelation process, which caused an easily measurable change in the extinction spectrum of the particles and provided an inherently sensitive method for Cr3+ detection in aqueous solution.

Red-to-blue colorimetric detection of chromium via Cr (III)-citrate chelating based on Tween 20-stabilized gold nanoparticles

“…Cu 2+ , Hg 2+ , Cr 3+ , Cr 6+ and Pb 2+ ) and biomolecules because of various advantages such as without requiring sophisticated materials and complex instruments, reading out with the naked eyes, and high stability [15][16][17][18][19]. Typically, Wu's group had developed selective detection of trace Cr (III) in aqueous solution by using 5,5 -dithiobis (2-nitrobenzoic acid)-modified Au NPs, and the detection limit of this method in standard aqueous solution was 1.8 M [20]. Tseng's group had provided colorimetric method for the detection of Ag + and Hg 2+ based on an assembly of Tween 20-Au NPs [21].…”

A highly selective and sensitive colorimetric sensor for iodide detection based on anti-aggregation of gold nanoparticles

“…Many special ligands as analyte-receptors functionalized Au NPs were developed for the detection of ions [8][9][10][11][12][13][14][15][16][17] and small molecules [18][19][20][21]. For example, glutathione functionalized Au NPs for detection of Pb 2+ [10], mercaptopropionic acid for Hg 2+ [12], 5,5 -dithiobis(2-nitrobenzoic acid) for Cr 3+ [14], 1-(2-mercaptoethyl)-1,3,5-triazinane-2,4,6-trione for melamine [20]. These colorimetric sensors exhibited high sensitivity and selectivity toward target analytes relying on the Au NPs and the especially collected ligands.…”

Colorimetric Nanoprobes

“…Glutathione, dithiothreitol, and cysteine co-functionalized Au NPs have been fabricated for As 3+ detection (1 ppb) in groundwater [58]. Au NPs modified with 5, 5'-dithiobis (2-nitrobenzoic acid) were also used for the detection of trace levels Cr 3+ (99.6 ppb) in the presence of 15 other metal ions in aqueous solution [60]. 6-mercaptonicotinic acid and L-cysteine co-functionalized Au NPs were used for colorimetric detection of Cd 2+ (LOD = 100 nM) [59].…”

“…2.5A, the addition of sulfide ions into the Au@Ag core-shell nanocubes generated stable Au@Ag/Ag 2 S core-shell nanoparticles at room temperature, and the plasmon extinction maximum shifts to the longer wavelength covering the entire visible range of 500-750 nm with full-color tuning [24]. The silver-coated (30,60, and 120 nm edge length). Reprinted with permission from Ref.…”