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

Abstract

A dual strategy that the L‐cysteine self‐assembling on three‐dimensional network of organic‐hybrid‐materials realized by successive interaction of Au−S bond is employed to construct as the amplified electrochemical sensor for determination Cu (II). Specifically, the sensor combined a rigid three‐dimension inorganic net which provides a higher interfacial area as well as faster adsorption of ions. Accordingly, surface and interfacial‐dominated electro‐catalysis reactivity is used as an ideal test‐bed to verify the reliability of electrochemical sensor that reveal enhancement sensitiveness and selectivity, low detection limit, and stability over a long period of time. Time‐dependent density functional theory (TD‐DFT) were used to calculating the all complexes energies at the B3LYP/LANL2DZ level associated with the polarized continuum model (PCM). The result of calculation indicates that the binding strength of Cu (II), Cd (II), As (III), Hg (II) with L‐cysteine are decrease successively, and this is in well agreement with experimental results. This work not only achieves an unprecedented understanding to L‐cysteine/Au/TiO2/GCE sensor but also provides a new perspective for application in detection of Cu (II) in real river waters.

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

“…As can be seen from the calibration plot ( Figure 9B), there was a good linear relationship between the peak current and the logarithm of the Cu 2 + concentration in the range of 0.001 to 100 μM (I = 0.3404lnC Cu2 + + 2.6177, R 2 = 0.998), with a low detection limit of 0.457 nM (3δ). Compared with previous reports, this electrochemical sensor had a comparable low detection limit and wide linear range (Table S1) [6][7][8][9][10][38][39][40]. According to the U.S. Environmental Protection Agency (EPA), the maximum allowable concentration of copper ion in drinking water is 20 μM.…”

“…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].…”

Flexible Sensors Based on Organic–Inorganic Hybrid Materials

“…It promoted the electrocatalysis of the surface and interface and played a significant role in improving the ion detection performance. [ 112 ] Fluorescent sensors can also monitor ion concentration, with advantages such as simple operation, low cost, short reaction time and high sensitivity. The amount of Fe 3+ ions in the body plays an essential role in health and the fluorescent sensors based on the hybrid materials of frame structure like the MOFs can be used to detect Fe 3+ ions.…”

Layer-by-Layer Assembly of Electroactive Dye/LDHs Nanoplatelet Matrix Film for Advanced Dual Electro-optical Sensing Applications

“…In the newer researches, the use of an electrochemical sensor is introduced for more precise detection of Al 3+ ion [38]. A sensor that consists of a three-dimensional inorganic or two-dimensional organic/inorganic rigid network has a higher interfacial area for ion adsorption, and hence higher electrocatalysis reactivity in the sensor, which will result in higher sensitivity and selectivity of the electrochemical sensor [39]. Based on our knowledge, ITO/PET-layered (ARS/LDHs) n matrix presented here is the first electro-optical platform for aluminium monitoring.…”