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Biosynthesized Highly Stable Au/C Nanodots: Ideal Probes for the Selective and Sensitive Detection of Hg2+ Ions

Authors
Venkateswarlu, SadaGovindaraju, SaravananSangubotla, RoopkumarKim, JongsungLee, Min-HoYun, 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/gachon/handle/2020.sw.gachon/1934
DOI
10.3390/nano9020245
ISSN
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.
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바이오나노대학 > 바이오나노학과 > 1. Journal Articles
공과대학 > 화공생명공학과 > 1. Journal Articles
산업·환경대학원 > 산업환경공학과 > 1. Journal Articles

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BioNano Technology (Department of BioNano Technology)
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