One-Dimensional Semiconductor/Carbon Materials Electrochemiluminescence Detection Of Pentachlorophenol And Iron Ion

Electrochemiluminescence (ECL) has been a research hotspot and received considerable attention in the field of analysis, due to their low background noise, miniaturization, fast analysis, and wide linearity range. Recently, the ECL sensors are increasingly reported to detect environmental contaminants. But, there are still some significant barriers for the ECL sensors. One is the high cost and the inherently toxicity, which would limit their applications. The other is the single functional luminescent materials with poor response signal, which does not effectively detect to environmental contaminants. Most importantly, most of ECL sensors have limitation in particular high aggregation tendency that leads to poor stability and low reproducibility. Thus, the ECL species with excellent stability, nontoxicity, low cost and good ECL performance are urgently developed in environmental monitoring. On the basis of one-dimensional semiconductor nanomaterials, this paper constructs two kinds of highly stable ECL, the specific research work is as follows:(1) A highly stable and effective electrochemiluminescence (ECL) sensing platform of copper oxide nanowires coupled with reduced graphene oxide (CuO NWs/rGO) is presented for ultrasensitive detection of pentachlorophenol (PCP). The CuO NWs/rGO sensing system is prepared via an electrodeposition technique followed by chemical oxidation and annealing processes. The CuO nanowire is revealed to be electroluminescent for the first time, and the rGO greatly enhances the ECL signal. In the presence of the coreactant S2O82-, the CuO NWs/rGO-based ECL sensor can sensitively and selectively detect PCP with a wide linear range from 1.0×10-14 to 1.0 ×10-9 mol L-1 and a very low detection limit of 0.7×10-14 mol L-1 under the optimal conditions. The sensor shows excellent recyclability and outstanding durability evidenced by its nearly unchanged ECL signal after the sensing electrode being stored for 10 months in air at room temperature. The proposed ECL sensor could be a promising alternative method for the emergency and routine monitoring of the PCP in real environment.(2) Combined with the electrostatic spinning technology, TiO2 NFs was prepared, and then incorporate CQDs into the nanofibers to develop the CQDs/TiO2 NFs based-ECL sensor. The TiO2 NFs not only acts as the immobilization platform for CQDs, reducing the coagulation effect by nanoparticles, but also the porous structure of the nanofibers allowed an easy permeation of the coreactant S2O82- with the direct oxidation at the electrode, it can improve ECL intensity. The ECL intensity could be effectively quenched by Fe3+, a rapid, selective detection of Fe3+ was achieved within a linear range of 1.0×10-10 to 5.0×10-8gL-1, with the detection limit of 0.8×10-10g L-1. The proposed protocol can offer a supersensitive, highly selective, recyclable and valuable method for detection of Fe3+.