Sub-ppt level voltammetric sensor for Hg2+ detection based on nafion stabilized l-cysteine-capped Au@Ag core-shell nanoparticles

Autor: Syed Tufail Hussain Sherazi, Muhammad R. Shah, Hussein M. El-Sagher, Sameerah I. Al-Saeedi, Tayyaba Shaikh, Munazza Arain, Muhammad Saleem Kalhoro, Ali Alsalme, Farah Naz Talpur, Ayman Nafady, Samia Siddiqui, Suresh K. Bhargava, Sirajuddin
Rok vydání: 2019
Předmět:
Zdroj: Journal of Solid State Electrochemistry. 23:2073-2083
ISSN: 1433-0768
1432-8488
DOI: 10.1007/s10008-019-04298-2
Popis: Bimetallic nanoparticles (BMNPs) have received considerable attention due to their distinctive properties when compared to the corresponding monometallic NPs and their bulk counterpart. In this report, the formation of gold@silver core-shell nanoparticles (Au@AgCSNPs) was achieved via a one-pot synthetic approach after mixing 1:1 M solutions of Au and Ag ions. L-cysteine was used as reducing as well as capping agent for preparing Au@AgCSNPs. Ultraviolet-visible (UV-Vis) spectroscopy was employed for surface plasmon study while Fourier-transform infrared (FTIR) spectroscopy gave insights for interaction of NPs with specific functionality of the capping material. Surface morphology of the fabricated Au@AgCSNPs, probed by atomic force microscopy (AFM), indicated an average height of nanoparticles around 43 ± 3 nm and their crystallinity were confirmed via powder X-ray diffraction (PXRD) study. Significantly, the as synthesized Au@AgCSBMNPs were fabricated onto the conductive surface of glassy carbon electrode (GCE), stabilized with nafion, and then utilized as an extremely sensitive/greatly selective sensor for voltammetric detection of Hg2+. The developed sensor responded linearly to Hg2+ between 0.001 and 19 ppb with limit of detection (LOD) as low as 0.0001 ppb (0.1 ppt). Finally, the sensor was effectively applied for Hg2+ detection in different groundwater samples and is workable at concentrations undetectable by several sensing tools.
Databáze: OpenAIRE
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