Silver Nanoparticle-Based Sensor for the Selective Detection of Nickel Ions

Abstract

Silver nanoparticles (AgNPs) can be used as a surface plasmon resonance (SPR) colorimetric sensor; the correlation between the SPR phenomenon and the aggregation state of nanoparticle allows the real-time detection of a target molecule. Surface functionalization of NPs with proper molecular baits is often performed to establish the selectivity of the sensor. This work reports on the synthesis of AgNPs under reducing conditions and on the functionalization thereof with mercaptoundecanoic acid (11-MUA). UV-VIS Spectroscopy confirmed the formation of AgNPs, eliciting a surface plasmon absorption band (SPAB) at 393 nm that shifted to 417 nm upon surface coating. Dynamic light scattering was used to investigate the surface coatings; moreover, pelleted AgNPs@11MUA nanoparticles were characterized by scanning electron microscopy (SEM), energy dispersive X-ray analyzers (EDX), and infrared spectroscopy to corroborate the presence of 11MUA on the surface. Most interestingly, the resulting AgNPs@11MUA selectively detected micromolar levels of Ni2+, also in the presence of other cations such as Mn2+, Co2+, Cd2+, Cu2+, Zn2+, Fe2+, Hg2+, Pb2+, and Cr3+.

Recent advances on gold and silver nanoparticle-based colorimetric strategies for the detection of different substances and SARS-CoV-2: a comprehensive review

“…The method shows a 120 nM LOD at S/N = 3 with a correlation coefficient of R 2 = 0.9971. The Giovannetti group 155 reported the synthesis of AgNPs functionalized with mercaptoundecanoic acid (11-MUA). The synthesized AgNPs@11MUA were then been applied for the selective detection of micromolar levels of Ni 2+ in the presence of other cations.…”

A review of silver‐dopped graphene oxide nanocomposite: Synthesis and multifunctional applications

“…[ 46 ] Moreover, similarly to the adsorption mechanism of organic dyes, besides oxygenated functional groups of GO sheets, anchored AgNPs also act as a site for the attachment of heavy metal ions. [ 7,47 ] Additional adsorption mechanisms may occur with Hg 2+ ions due to the special interaction that can only be found for Hg 2+ and AgNPs. [ 12 ]…”

“…Additionally, the metal sensing performance of the nanocomposite can be significantly enhanced thanks to the surfaceenhanced Raman scattering phenomena of AgNPs. [7,8] However, the limitation of scientific documents that comprehensively summarize the multifunctional applications of graphene-based materials has decelerated the investigation and studying process of the researchers. Therefore, it is necessary to provide a comprehensive summary of the synthesis approach, as well as the multifunctional application of Ag/GO nanocomposite.…”

Structural relaxation in Ag-Ni nanoparticles: atomistic modeling away from equilibrium

“…Among the variety of metals that have been combined into nanoalloys, silver and nickel have been particularly scrutinized, owing to their potential interest in catalysis [3][4][5][6][7][8], energy production [9,10], optics [11] and even as nano inks [12]. As a result, their fundamental properties have been investigated in details as well, in particular their chemical reactivity [13], magnetism [14], or optical and plasmonic response [15][16][17].…”