Paper-based colorimetric sensor for mercury ion detection using smartphone digital imaging

Pakorn PREECHABURANA; Somsak  SANGNUY; Supaluck AMLOY

doi:10.55713/jmmm.v33i2.1653

Authors

Pakorn PREECHABURANA Thammasat University Research Unit in Innovation of Optical Devices and Nanomaterials for Chemical and Biological Sensing, Thammasat University, Pathumthani 12120, Thailand.; Department of Physics, Faculty of Science and Technology, Thammasat University, Pathumthani 12120, Thailand. https://orcid.org/0000-0002-5947-3596
Somsak SANGNUY Thai Traditional Medicine, Faculty of Health and Sports Science, Thaksin University, Phattalung 93210, Thailand.
Supaluck AMLOY Thammasat University Research Unit in Innovation of Optical Devices and Nanomaterials for Chemical and Biological Sensing, Thammasat University, Pathumthani 12120, Thailand.; Department of Physics, Faculty of Science and Technology, Thammasat University, Pathumthani 12120, Thailand.

DOI:

https://doi.org/10.55713/jmmm.v33i2.1653

Keywords:

plasmon, localized surface plasmon resonance, colorimetric, paper-based sensor

Abstract

In this research, we have developed a colorimetric paper-based sensing platform for the determination of mercury ion (Hg²⁺) using gold nanoparticles (AuNPs). To evaluate the selectivity in the response to a special target, urea is used as recognizing ligands on AuNPs for selective sensing Hg²⁺. Colorimetric readings in the presence of various environmentally relevant metal ions, such as Na⁺, K⁺, Zn²⁺, Pb²⁺, and Hg²⁺, were also studied. The results show that amongst all the tested metal ions, the SPR peaks are located at 525 nm except in the case of the present of Hg²⁺, in which is red shifted to 537 nm. Furthermore, a new broad peak is observed at the wavelength of 695 nm corresponding to the color change from red to purple. The relations of the ratios of maximum absorbance at 695 nm and 537 nm, and the concentration of Hg²⁺ illustrate the linear behavior with the sensitivity of 2.0 × 10^-5 nM^-1 and the detection limit of 30 nM. The modified AuNPs with urea are applied on the paper-based device for quantitative Hg²⁺ detection with smartphone digital imaging. The intensity ratios between blue and red colors are linear-dependence relations which can be used to determine the concentration of Hg²⁺.

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