A simple label-free electrochemical aptamer sensor for detection of Hg2+based on black phosphorus

In this work, a simple label-free aptamer-based electrochemical sensor was developed for determination of mercury ions (Hg2+) by polylysine (PLL) modified black phosphorus nanosheets (BP) and gold nanoparticles (AuNPs) as signal amplification strategy. The PLL-BP composite materials greatly improved electron transfer speed and electrochemical behavior of electrode in the detection of analytes. AuNPs can amplify the electrochemical signal and facilitate the binding of aptamers to the electrode. The selected aptamer (Apt) can bind specifically to Hg2+ to form a T-Hg2+-T structure, which we used to detect Hg2+. Experimental results showed that the prepared electrochemical aptamer sensor exhibited wide linear range from 1.0-500 nM, along with IP: 846247 10 On: Mon 07 Nov 2022 09 20:55 a low detection limit of 0.14 nM. Moreover, Copyrigh: theAmerian electrochemicalScientific aptamerPublisherssensor has good specificity, stability, and repeatability. Therefore, this proposed elctrochemical apmer sensor provide a simple and sensitive Delivered by Ingenta method for the detection of Hg2+, which is expected to be used for the detection of trace amounts of Hg2+ in actual samples.

Automated summary

In this study, a simple label-free aptamer-based electrochemical sensor was developed for the determination of mercury ions. Polylysine modified black phosphorus nanosheets and gold nanoparticles were used as signal amplification strategy. The experimental results showed that the sensor exhibited a wide linear range and low detection limit, and had good specificity, stability, and repeatability.