| Info. | Vol.15 - No.3 (2021.09.20) |
|---|---|
| Title | Portable Au Nanoparticle-Based Colorimetric Sensor Strip for Rapid On-Site Detection of Cd2+ Ions in Potable Water |
| Authors | Hui Hun Cho3 · Jun Hyuk Heo1,2 · Do Hyeon Jung1 · So Hui Kim1 · Su-Jeong Suh1 · Kwon Hoon Han3 · Jung Heon Lee1,2,3,4 |
| Institutions | *Jun Hyuk Heo saegusa@skku.edu
*Kwon Hoon Han kwonhoon@skku.edu *Jung Heon Lee jhlee7@skku.edu 1School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea 2Research Center for Advanced Materials Technology (RCAMT), Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea 3SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea 4Biomedical Institute for Convergence at SKKU (BICS), Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea |
| Abstract | Simple, rapid, and instrument-free detection of cadmium ions (Cd 2+ ) with a portable device is essential to prevent the contamination of potable water. Herein, we propose a simple, fast, and low-cost method for the real-time/on-site detection of Cd 2+ using glutathione-modified Au nanoparticles (GSH-AuNPs) deposited on a polyethylene terephthalate (PET) sensor strip. To fabricate the sensor strip, a paint composed of GSH-AuNPs and polyvinylpyrrolidone was prepared. Subsequently, the GSH-AuNP paint was deposited on a mold fixed on the PET substrate and dried in ambient air. The GSH-AuNPs deposited on the PET substrate quickly redispersed in water, turning the water red. However, the GSH-AuNPs aggregated in water samples containing Cd 2+ , turning the water blue. The limit of detection of this Cd 2+ sensor strip is 18.8 nM, which is comparable to the maximum contamination level of 44.5 nM Cd 2+ in potable water stipulated by the US Environmental Protection Agency. Finally, we demonstrate that the GSH-AuNP-based sensor strip can be used in the on-site detection of Cd 2+ in real samples such as tap water. |
| Keyword | Colorimetric sensor strips · Cadmium · Real-time/on-site detection · Gold nanoparticles (AuNPs) · Solid-type |
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