Dual-Mode Optical Nanosensor Based on Gold Nanoparticles and Carbon Dots for Visible Detection of As(III) in Water

Abstract

To eliminate the occurrence of false positives and improve the accuracy of measurement results in the process of environmental detection, a single-switch dual-mode nanosensing method should be developed for real-time and in situ detection. Herein, we constructed a colorimetric and fluorescent dual-mode optical nanosensor for accurate detection of As(III) in water. The nanosensor consisted of trithiocyanuric acid modified gold nanoparticles (TMT-Au NPs) and amino-functionalized carbon dots (NCDs). When TMT-Au NPs were injected into the NCDs solutions, the fluorescence of NCDs was weakened due to the overlap of the UV−vis absorption peak of TMT-Au NPs and emission peak of NCDs based on an internal filtering effect. With the addition of As(III), the coordination of As(III) with sulfhydryl groups of TMT-Au NPs occurred, causing the aggregation of TMT-Au NPs for colorimetric detection based on local surface plasmon resonance with a limit of detection (LOD) of 0.87 ppb. Meanwhile, the fluorescence of the NCDs was recovered during the aggregation process of TMT-Au NPs for fluorescence detection with an LOD as low as 0.66 ppb. The reported dual-mode optical nanosensor will be widely used in the field of environmental water detection.

Development of Nanosensors Based Intelligent Packaging Systems: Food Quality and Medicine

“…Babar et al [50] developed a low-cost gold nano-textured electrode for detecting arsenic in food and water. For selective and responsive examination, this electrochemical gold nano-textured electrode can be used to detect arsenic in a complex system comprising Fe 2+ , Pb 2+ , Hg 2+ , Cu 2+ , Ni 2+ , and other ions [51]. Optical dual-mode nanosensors based on gold nanoparticles and CQDs could detect arsenic (ii) in water in a recent sample [52].…”

A Simple and Sensitive Nanogold RRS/Abs Dimode Sensor for Trace As3+ Based on Aptamer Controlled Nitrogen Doped Carbon Dot Catalytic Amplification

“…In severe cases, it can lead to cancer or even death. In addition, an experiment also confirmed that As (III) has carcinogenic effects [ 26 ]. Therefore, with the increase in people’s attention to heavy metal pollution in the environment, it is particularly important to develop a sensitive, rapid, and convenient As 3+ detection method.…”

Collaborative Construction of a Silver Nanocluster Fluorescent Probe Using the Pyridinium-Based Ionic Liquid [C4py][DCA]

“…Boruah 20 et al and Banerjee 21 et al detected As(III) in water using a colorimetric nanosensor with the LOD valued of 1 ppb and 0.86 ppb, respectively. Li 22 et al constructed a portable colorimetric and a fluorescence nanosensor with the LOD values of 0.87 and 0.66 ppb, respectively, to detect As(III) in water. Pathan 23 et al and Sun 24 et al found a fluorescence nanosensor with the LOD values of 5.1 and 1 ppb, respectively.…”