Colorimetric and naked-eye detection of arsenic(iii) using a paper-based microfluidic device decorated with silver nanoparticles

Abstract

Arsenic (As) as a metal ion has long-term toxicity and its presence in water poses a serious threat to the environment and human health.

A facile approach for selective detection of arsenite ions using plasmonic behaviour of silver nanoparticles

“…The lowering of the SPR observed may be due to the HCO 3 − induced adsorption of AsO 2 − ion on the surface of the NPs. From this study and some previous reports, 23–25 the proposed mechanism is shown in Scheme 1. The formation of silver ion–citrate complex formation followed by heat-induced chemical reduction and Ostwald ripening leads to the formation of Ag NPs, where citrate itself acts as capping agent to provide colloidal stability of Ag NPs.…”

“…The lowering of the SPR observed may be due to the HCO 3 − induced adsorption of AsO 2 − ion on the surface of the NPs. From this study and some previous reports, [23][24][25] the proposed mechanism is shown in Scheme 1.…”

“…23 Similarly, the As III ion exhibits redox activity with free Ag + ions in the AgNP system and changes the morphology of the NPs (LOD value of 0.005 ppm). 24 In another type of study, water soluble silver arsenite formation led to surface leaching from polyvinylpyrrolidone capped silver nanoprisms in the presence of AsO 2 − ions, and a colorimetric change was observed with a LOD value of 75 ppb. 25 This type of morphology-based colour change has also been observed in the case of SCN − due to the leaching of Ag atoms from the nanostructure.…”

“…Yet, these techniques have a number of shortcomings for colorimetric sensing, including (i) designing complex nanoprobes using specic thiol based reagents/multiligands, (ii) expensive nanoprobes using aptamers, (iii) low colloidal stability due to nonspecic interactions, (iv) complex strategies, and (v) low selectivity and (vi) reproducibility of data. [21][22][23][24][25][26] So, we can discontinue using aggregation-based sensing techniques or modify them to eliminate their drawbacks. Instead of discontinuing the use of such techniques, it is better to develop a simple, stable, and reproducible surface plasmon based optical sensor that can detect trace level of arsenic in contaminated water.…”

Microfluidic paper-based colorimetric quantification of malondialdehyde using silver nanoprism toward on-site biomedical analysis: a new platform for the chemical sensing and biosensing of oxidative stress

“…41–45 Based on these facts, AgNPrs have a special place in the construction of colorimetric sensors. 46 So far, several sensors and biosensors have been developed by either etching or the growth of different analytes onto this optical nanoprobe. 31,47…”