Selective and Sensitive Colorimetric Recognition of Ba²⁺ Ion Using Guanine‐Functionalized Silver Nanoparticles

Abstract

Herein, a novel silver nanoparticles (Ag NPs) based colorimetric method was explored for selective recognition of Ba2+ ion in water samples using guanine‐Ag NPs as a sensor. The colorimetric recognition strategy was based on the significant change in the surface plasmon resonance (SPR) band of guanine‐Ag NPs with Ba2+ ion. The electron‐rich groups (‐NH2, ‐CO‐NH and ‐NH‐) on the surfaces of guanine‐Ag NPs allow to act as an excellent probe for selective colorimetric recognition of Ba2+ ion. The absorption ratio at A504/A420 was shown linear response with Ba2+ ion concentration (0.005‐0.5 μM), with limit of detection of 0.003 μM (3.0 nM). The color change of guanine‐Ag NPs in water samples is ascertained facile, rapid, selective and sensitive recognition of Ba2+ ion at trace levels (nanomolar) without use of sophisticated analytical technique. The developed probe simplifies the sample preparations and provides a rapid analytical tool for sensing of Ba2+ ion environmental samples at minimal volume of samples.

Functionalized Silver Nanoparticles for Rapid Detection of Mn2+ Employing a Smartphone Platform

“…[25] The guanine-modified AgNPs can be a probe for sensing Ba 2 + ions. [26] Furthermore, the AgNPs modified with stabilizing agents can selectively detected Mn 2 + . [27] When these AgNPs bounded with Mn 2 + , the particles will be aggregated leading to larger particle size which causing the color change.…”

“…For example, AgNPs bifunctionalized with mercaptonicotinic acid and melamine were used for simultaneous detection of Cr 3+ and Ba 2+ ions [25] . The guanine‐modified AgNPs can be a probe for sensing Ba 2+ ions [26] . Furthermore, the AgNPs modified with stabilizing agents can selectively detected Mn 2+ [27] .…”

Green Synthesis of Silver Nanoparticles using <i>Lantana camara</i> Fresh Leaf Extract for Qualitative Detection of Hg²⁺, Cu²⁺, Pb²⁺, and Mn²⁺ in Aqueous Solution

“…In addition, AgNPs can also be used to enhance their role as metal ion sensors. The functionalization of AgNPs with guanine has been used as a Ba 2+ ion sensor [14].…”

Waste from Argentometric Determination of Chloride as a Source of Silver in the Synthesis of p‐Hydroxybenzoic Acid Capped Silver Nanoparticles

“…The measurement is based on a change in surface plasmon resonance spectra resulting from an analyte's interaction with the AgNPs. [7,8] AgNPs have been used in the colorimetric determination of metal ions such as Ba(II), [9] Cd(II), [10] Fe(III), [11] Hg(II), [12] and organic compounds like melamine, [13] paraquat, [14] arginine, and spermine. [15] The metal nanoparticles can be prepared by a method that is categorized as a top-down and bottom-up method.…”