Bimetallic Nanoparticles for Arsenic Detection

Abstract

Effective and sensitive monitoring of heavy metal ions, particularly arsenic, in drinking water is very important to risk management of public health. Arsenic is one of the most serious natural pollutants in soil and water in more than 70 countries in the world. The need for very sensitive sensors to detect ultralow amounts of arsenic has attracted great research interest. Here, bimetallic FePt, FeAu, FePd, and AuPt nanoparticles (NPs) are electrochemically deposited on the Si(100) substrate, and their electrochemical properties are studied for As(III) detection. We show that trace amounts of As(III) in neutral pH could be determined by using anodic stripping voltammetry. The synergistic effect of alloying with Fe leads to better performance for Fe-noble metal NPs (Au, Pt, and Pd) than pristine noble metal NPs (without Fe alloying). Limit of detection and linear range are obtained for FePt, FeAu, and FePd NPs. The best performance is found for FePt NPs with a limit of detection of 0.8 ppb and a sensitivity of 0.42 μA ppb(-1). The selectivity of the sensor has also been tested in the presence of a large amount of Cu(II), as the most detrimental interferer ion for As detection. The bimetallic NPs therefore promise to be an effective, high-performance electrochemical sensor for the detection of ultratrace quantities of arsenic.

Inorganic arsenic speciation by electroanalysis. From laboratory to field conditions: A mini-review

“…therein] and composites (M-NPs with carbon nanotubes or graphene) with electrocatalytic and adsorption properties [28,46,[49][50][51][52][53][54][55][56][57][58][59][60][61][62][63].…”

“…This may be done by changing the composition of the background solutions [48,77] and the measured signal (As 35); or by modifying the surface using M-NPs, their composites [37,51,58,[78][79][80], ligands (-SH, -NH 2 ) or organic membranes [11,38,40,44,49,56,80]. Other effective methods employ flowthrough systems [82] or cation exchangers [43,75,[83][84][85][86].…”

Gold nanoparticle-based sensing platform of hydrazine, sulfite, and nitrite for food safety and environmental monitoring

“…The metal nanoparticles play a key role in catalytic and electrocatalytic reactions which may empower numerous functionalities to line up for the targeted applications because of the interactivity of essential nanostructured sensor elements with their immediate local environments (Chen and Chatterjee 2013;Govindhan et al 2014, Huber et al 2015Maduraiveeran and Ramaraj 2009). Especially, gold nanoparticles (Au NPs) have found use in areas ranging from chemical separations and sensing to direct applications in the medical, food, and environmental community due to their unique chemical, optical, and electronic properties (Huber and Leopold 2016;Moghimi et al 2015;Wang et al 2015;Zhang et al 2017).…”

Bifunctional Fe3O4/Ag nanoparticles obtained by two-step laser ablation in pure water

“…and heterogeneous catalysis [1][2][3][4][5][6]. These applications are often related to the Raman signal amplification of the adsorbed molecules by SERS (surface-enhanced Raman scattering) effect [7], due to the collective oscillations of free electrons on the nanostructured surface of noble metals excited by an incident radiation, known as localized surface plasmons.…”