Currently, heavy metal ion contamination in water is becoming more and more common, especially Pb(II), which is a serious threat to human health. In this experiment, MoS2/rGO nanocomposites were used to modify glassy carbon electrodes and square wave voltammetry(SWV) electrochemical detection method was selected to detect trace Pb(II) in water. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) showed that MoS2 nanoparticles were uniformly distributed on the rGO films. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) showed that MoS2/rGO has higher sensitivity and conductivity. After determining the optimal experimental parameters, the MoS2/rGO modified glassy carbon electrodes exhibited high sensitivity (57.57 μA μM−1) and low limit of detection (0.060 μM) for Pb(II) as well as good interference resistance and stability.
Nuclear security usually requires the simultaneous detection of neutrons and gamma rays. With the development of crystalline materials in recent years, Cs2LiLaBr6 (CLLB) dual-readout detectors have attracted extensive attention from researchers, where real-time neutron/gamma pulse discrimination is the critical factor among detector performance parameters. This study investigated the discrimination performance of the charge comparison, amplitude comparison, time comparison, and pulse gradient methods and the effects of a Sallen–Key filter on their performance. Experimental results show that the figure of merit (FOM) of all four methods is improved by proper filtering. Among them, the charge comparison method exhibits excellent noise resistance; moreover, it is the most suitable method of real-time discrimination for CLLB detectors. However, its discrimination performance depends on the parameters $${t}_\text{s}$$ t s , $${t}_\text{m}$$ t m , and $${t}_\text{e}$$ t e . When $${t}_\text{s}$$ t s corresponds to the moment at which the pulse is at 10% of its peak value, $${t}_\text{e}$$ t e requires a delay of only 640–740 ns compared to $${t}_\text{s}$$ t s , at which time the potentially optimal FOM of the charge comparison method at 3.1–3.3 MeV is greater than 1.46. The FOM obtained using the $${t}_\text{m}$$ t m value calculated by a proposed maximized discrimination difference model (MDDM) and the potentially optimal FOM differ by less than 3.9%, indicating that the model can provide good guidance for parameter selection in the charge comparison method.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.