Mercury is widely used in various research and industrial areas. However, due to the ionization of mercury to the mercury ion, the influence of this ion on human health and the environment is cause for concern. Gold nanoparticles (AuNPs) are the most widely studied nanomaterial because of their unique optical, chemical, electrical, and catalytic properties and have attracted much interest regarding the applications to detection of toxic metal ions. In this paper, we propose a technique for detection of divalent mercury using AuNPs and Mercury-specific-oligonucleotide–conjugated resonators (MSOIRs). The detection technique is based on the measurement of a resonance frequency shift in the resonators that results from a specific interaction between the thymine–thymine base pair and mercury ion as well as the adsorption of AuNPs that act as a mass amplifier. Our proposed method can quantify mercury ions with the limit of detection of 100 pM, which is 10-fold better than that of the existing assays. Furthermore, MSOIR can detect mercury ions in real tap water. These results imply that the mercury-detecting sensor may be used to enhance drinking-water quality.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) under Grant Numbers NRF-2014R1 A2A1A11052389, NRF-2016R1A5A1010148, NRF-2015M3 A9D7031026 and NRF-2016R1C1B1014817, funded by the Ministry of Science, ICT & Future Planning.
© 2018, The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature.
- Gold nanoparticle
- Mass amplifier
- Mercury ion
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering