Biosynthesized Highly Stable Au/C Nanodots: Ideal Probes for the Selective and Sensitive Detection of Hg2+ Ions
- Authors
- Venkateswarlu, Sada; Govindaraju, Saravanan; Sangubotla, Roopkumar; Kim, Jongsung; Lee, Min-Ho; Yun, Kyusik
- Issue Date
- Feb-2019
- Publisher
- MDPI
- Keywords
- onion leaves; GCNDs; orange fluorescent; TEM; mercury ion sensor
- Citation
- NANOMATERIALS, v.9, no.2
- Journal Title
- NANOMATERIALS
- Volume
- 9
- Number
- 2
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/18296
- DOI
- 10.3390/nano9020245
- ISSN
- 2079-4991
2079-4991
- Abstract
- The enormous ongoing industrial development has caused serious water pollution which has become a major crisis, particularly in developing countries. Among the various water pollutants, non-biodegradable heavy metal ions are the most prevalent. Thus, trace-level detection of these metal ions using a simple technique is essential. To address this issue, we have developed a fluorescent probe of Au/C nanodots (GCNDs-gold carbon nanodots) using an eco-friendly method based on an extract from waste onion leaves (Allium cepa-red onions). The leaves are rich in many flavonoids, playing a vital role in the formation of GCNDs. Transmission electron microscopy (TEM) and Scanning transmission electron microscopy-Energy-dispersive X-ray spectroscopy (STEM-EDS) elemental mapping clearly indicated that the newly synthesized materials are approximately 2 nm in size. The resulting GCNDs exhibited a strong orange fluorescence with excitation at 380 nm and emission at 610 nm. The GCNDs were applied as a fluorescent probe for the detection of Hg2+ ions. They can detect ultra-trace concentrations of Hg2+ with a detection limit of 1.3 nM. The X-ray photoelectron spectroscopy results facilitated the identification of a clear detection mechanism. We also used the new probe on a real river water sample. The newly developed sensor is highly stable with a strong fluorescent property and can be used for various applications such as in catalysis and biomedicine.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of ICT Engineering > School of Integrative Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.