3D Nano‐structure L‐cysteine/AuNPs/Bi₂O₃ Modified Glass Carbon Electrode as Chemical Sensor for Highly Sensitive and Selective Detection Cu (II)

Abstract

It was first time using the l‐cysteine self‐assembled on the surface of gold nanoparticles and Bi2O3 nano‐structured materials modified GCE composed l‐cysteine/AuNPs/Bi2O3/GCE sensor. The sensor possessed three‐dimensional nanostructure and exhibited a higher ratio of activity sites, large active surface, fast electron transfer rate, excellent catalytic, sensing characteristics and larger affinity to Cu (II). The sensor was determined to have an excellent sensitivity and selectivity for the detection of Cu (II). The characterization of sensor as well as the optimization of the analytical procedure was reported. The optimized conditions parameters allowed the detection of Cu (II) concentration following short analysis time, a detection limit of 5×10−11 M at 80 s of preconcentration time was obtained using the as‐prepared sensor, and also show excellent stability and good repeatability, and, thus, could be used for detection of Cu (II) in environment.

Organic‐inorganic‐hybrid‐enhancement Electrochemical Sensor for Determination of Cu (II) in River Water

“…Glassy carbon electrode (a class of good conductivity electrode material) provide the most effective electrochemically insert to higher resistibility towards environment complications and aggressive chemical agent during electrochemical methods . For extend and/or enhance application in electrochemical detection systems, researches are bound up with the modified glassy carbon electrode (GCE) has notably augmented . Among these modification methods, their applicability is an important strategy in construction of modification of the GCE with vast variety of nano‐materials such as CNTS , Au NPs , Pt NPs , Cu NPs , TiO 2 ‐graphene nano‐composite and L‐cysteine/AuNPs/Bi 2 O 3 modified GCE .…”

“…The detection limit of 1×10 −9 mol/L was obtained with the calculation based on a signal‐to‐noise ratio equal to 3 (S/N=3). This detection limit is significantly lower than 8.0×10 −9 mol/L with DNA−Ag NC probes and lower than the reported detection limit of 3×10 −9 mol/L with carbon paste electrodes , which is much less than the guideline value of Cu (II) in drinking water stipulated by the World Health Organization (WHO) . Meanwhile, the limit of detection and linear range of this method compared with other reported methods were showed in Table S1.…”

“…Cu (II) is a metal ion that is widespread in aquatic systems and an indispensable element at trace level to keep the metabolism of the human body, which is also toxic at high concentration . The United States Environmental Protection Agnency (USEPA) and World Health Organization (WHO) have set the safety limit of Cu (II) in potable water with 2.05×10 −5 mol/L and 1.57–3.15×10 −5 mol/L . For the above reason evaluating the concentration of Cu (II) with high selective and enhancement sensitivity is one of the most attractive, yet‐unrealized goals in many biological systems and industries.…”

“…For extend and/or enhance application in electrochemical detection systems, researches are bound up with the modified glassy carbon electrode (GCE) has notably augmented . Among these modification methods, their applicability is an important strategy in construction of modification of the GCE with vast variety of nano‐materials such as CNTS , Au NPs , Pt NPs , Cu NPs , TiO 2 ‐graphene nano‐composite and L‐cysteine/AuNPs/Bi 2 O 3 modified GCE . Compared to non‐modified electrodes, nano‐materials modified electrode is providing higher surface area, rich‐chemical‐specificities, regulatable conductivities, propitious to the electron transmission, and further enhancement the sensitivity and selectivity .…”

An Electrochemical Sensor for the Detection of Cu2+ Based on Gold Nanoflowers‐modifed Electrode and DNAzyme Functionalized Au@MIL‐101 (Fe)

“…To date, many methods for detecting copper ions have been developed, such as ultraviolet-visible spectroscopy (UV-Vis), inductively coupled plasma mass spectrometry (ICP-MS), colorimetry, fluorometric analysis, atomic absorption spectrometry (AAS), chemiluminescence and electrochemical methods [2,4,1,[5][6][7][8][9][10]. Among these methods, electrochemical methods have attracted wide attention because of their high sensitivity, simplicity, portability, low cost and strong selectivity [11].…”