A Versatile Carbon Fiber Cloth‐supported Au Nanodendrite Sensor for Simultaneous Determination of Cu(II), Pb(II) and Hg(II)

Abstract

A carbon fiber cloth (CFC)‐supported Au nanodendrite (AuND@CFC) sensor was used to simultaneously measure the concentrations of Pb(II), Cu(II) and Hg(II) in real water samples. The sensor had a large electrochemically active surface area due to the hierarchical nanodendrite structure and the formation of the nanodendrite structure on the CFC was accomplished in just 5 minutes by single‐step electrodeposition. After the optimization of important experimental conditions, such as pH and pre‐concentration time, the achieved limit of detections (LODs) in the measurements of Pb(II), Cu(II) and Hg(II) were 0.15, 0.07, and 0.13 ppb, respectively, which were superior and comparable to those reported in previous studies. The electrochemical responses of each analyte (concentration: 2.0 ppb) were not influenced when the concentrations of interferants (Cr(IV), Ni(II), Mn(II), Zn(II), Al(III), Ca(II) and Mg(II)) were even 500‐fold greater (1.0 ppm); while only the signal of Cu(II) decreased when the Ni(II) concentration were 4.0 ppm (2000‐fold larger). When eight separately prepared AuND@CFC sensors were used to measure the samples, the relative standard deviations (RSDs) of the peak intensities of these metals were lower than 5.0 %, thereby indicating the superior sensor‐to‐sensor reproducibility. When real river and lake water samples were analyzed, the determined concentrations were similar to those measured with ICP‐MS and the recoveries ranged from 93.2 %–118.7 %. Overall, the proposed sensor is versatile enough to be incorporated into a portable analytical system for on‐site detection of Pb(II), Cu(II) and Hg(II) in real field samples.

Amplified Electrochemical Aptasensor for Sialic Acid Based on Carbon‐Cloth‐Supported Gold Nanodendrites and Functionalized Gold Nanoparticles

“…In order to confirm the successful electrodeposition of AuNDs on the surface of the CC electrode, scanning electron microscopy (SEM) was employed for the morphology characterization. [40,41] As shown in Figure 1, AuNDs were deposited uniformly on the CC fiber, forming a distinct dendritic structure. These AuNDs with a diameter of about several μm were well aligned along the column.…”

“…An excellent substrate has significant impacts on the performances of electrochemical sensing system. In order to confirm the successful electrodeposition of AuNDs on the surface of the CC electrode, scanning electron microscopy (SEM) was employed for the morphology characterization . As shown in Figure , AuNDs were deposited uniformly on the CC fiber, forming a distinct dendritic structure.…”

Voltammetric Determination of Hg2+, Zn2+, and Pb2+Ions Using a PEDOT/NTA-Modified Electrode

“…Spatial differences in current peak locations for metal ions provide a precise strategy to detect metal ions, minimizing interfering influences from other metal ions. 59 …”

An electrochemical detection of cadmium (II) and lead (II) ions using a polymer-modified electrode with a Schiff base by square wave voltammetry

“…The limits of detection (LOD) were measured as 0.95 μg L -1 and 1.84 μg L -1 for the Cd (II) and Pb (II) ions, respectively, which demonstrates the high sensitivity of the modi ed polymer electrode towards heavy metal ion detection. The separation in peaks locations for metal ions offer an accurate strategy to detect Cd (II) and Pb (II) ions, signi cantly reducing interfering effects from other heavy metal ions [44,45].…”